Entries |
Document | Title | Date |
20080197817 | CONTROL ARRANGEMENT FOR A PFC POWER CONVERTER - In a PFC (Power Factor Correction) converter control unit, a PWM (pulse width modulated) signal is produced by comparing a PFC converter output voltage error signal, produced by a transconductance amplifier, with a ramp signal, which may be from a control unit of a resonant mode converter in cascade with the PFC converter. Level shifting is used to match the amplitude ranges of the compared signals. A current, representing an input current of the PFC converter and produced by a current mirror, is switched by the PWM signal to a parallel resistance and capacitance to produce a smoothed voltage constituting a control signal for the PFC converter. | 08-21-2008 |
20080272744 | POWER CONTROL SYSTEM USING A NONLINEAR DELTA-SIGMA MODULATOR WITH NONLINEAR POWER CONVERSION PROCESS MODELING - A power control system includes a switching power converter and a power factor correction (PFC) and output voltage controller. The switching power converter utilizes a nonlinear energy transfer process to provide power to a load. The PFC and output voltage controller generates a control signal to control power factor correction and voltage regulation of the switching power converter. The PFC and output voltage controller includes a nonlinear delta-sigma modulator that models the nonlinear energy transfer process of the switching power converter. The nonlinear delta-sigma modulator generates an output signal used to determine the control signal. By using the nonlinear delta-sigma modulator in a control signal generation process, the PFC and output voltage controller generates a spectrally noise shaped control signal. In at least one embodiment, noise shaping of the control signal improves power factor correction and output voltage regulation relative to conventional systems. | 11-06-2008 |
20080272745 | POWER FACTOR CORRECTION CONTROLLER WITH FEEDBACK REDUCTION - A power control system includes a feedback loop having a power factor correction (PFC) and output voltage controller and a switching power converter. The switching power converter includes an inductor to supply charge to an output capacitor and a switch to control inductor current ramp-up times. The PFC and output voltage controller provides a control signal to the switch to control PFC and regulate output voltage of the switching power converter. During a single period of the control signal, the PFC and output voltage controller obtains the line input voltage and output voltage of the switching power converter using a single feedback signal received from the switching power converter. | 11-06-2008 |
20080272746 | POWER FACTOR CORRECTION CONTROLLER WITH SWITCH NODE FEEDBACK - A power control system includes a switching power converter and a power factor correction (PFC) and output voltage controller. The PFC and output voltage controller provides a control signal to a switch to control power factor correction and regulate output voltage of the switching power converter. During a single period of the control signal, the PFC and output voltage controller determines the line input voltage, the output voltage, or both using a single feedback signal received from the switching power converter. The feedback signal is received from a switch node located between an inductor and the switch. The PFC and output voltage controller determines either the line input voltage or the output voltage, whichever was not determined from the feedback signal, using a second feedback signal received from either a PFC stage or a driver stage of the switching power converter. | 11-06-2008 |
20080272747 | PROGRAMMABLE POWER CONTROL SYSTEM - A power control system includes a switching power converter and a programmable power factor correction (PFC) and output voltage controller. The programmable PFC and output voltage controller generates a control signal to control power factor correction and voltage regulation of the switching power converter. In at least one embodiment, the control signal is a pulse width modulated signal. The programmability of the PFC and output voltage controller provides the programmable PFC and output voltage controller flexibility to operate in accordance with programmable parameters, to adapt to various operating environments, and to respond to various operating exigencies. In at least one embodiment, the programmable PFC and output voltage controller includes a state machine to process one or more programmable, operational parameters to determine the period and pulse width states of the control signal. | 11-06-2008 |
20090015214 | Power factor correction method and device - A power factor correction method and the controller thereof, applied to a boost-type converter, are provided. First, the power factor correction method uses the input and output voltages to generate a reference switching signal. Next, a voltage control circuit uses the difference between the output voltage and a voltage command to get a duty phase. Then, the switching control signal is determined by shifting the phase of the reference switching signal according to the duty phase. Finally, a comparator compares the switching control signal with a triangle waveform signal to determine the switching signal. A power factor controller, which utilizes this method, uses only a single voltage control circuit to get the switching signal to regulate the output voltage and shape the current waveform without sensing current and a current control circuit, so that the complexity of the invented control circuit for the power factor correction is reduced dramatically. | 01-15-2009 |
20090128100 | Power system control apparatus and power system control method - A SVC control section detects a bus voltage from an instrument transformer, and adjusts reactive power generated by a SVC according to the detected bus voltage. A cooperative control section generates a control command for controlling the interconnection and parallel-off of a phase lead capacitor and a phase lag reactor on the basis of the amount of reactive power generated by the SVC and the bus voltage detected by the instrument transformer and a voltage sensor. A voltage comparator compares the bus voltage with a predetermined threshold voltage set to a voltage lower than a lower limit value of a steady state fluctuation range of the bus voltage and outputs the comparison result to a circuit breaker control section. When the bus voltage is lower than the threshold voltage, the circuit breaker control section locks the control command from the cooperative control section. | 05-21-2009 |
20090146618 | FIXED-OFF-TIME POWER FACTOR CORRECTION CONTROLLER - A control device for a power factor correction device in forced switching power supplies is disclosed; the device for correcting the power factor comprises a converter and said control device is coupled with the converter to obtain from an input alternating line voltage a regulated output voltage. The converter comprises a power transistor and the control device comprises a driving circuit of said power transistor; the driving circuit comprises a timer suitable for setting the switch-off period of said power transistor. The timer is coupled with the alternating line voltage in input to the converter and is suitable for determining the switch-off period of the power transistor in function of the value of the alternating line voltage in input to the converter. | 06-11-2009 |
20090218993 | DEVICE AND A METHOD FOR CONTROL OF POWER FLOW IN A TRANSMISSION LINE - A device for control of power flow in a three-phase ac transmission line. The device includes a series transformer unit, a shunt transformer unit, and a reactance unit. | 09-03-2009 |
20090284233 | Quantized voltage feed-forward a power factor correction controller - A quantized voltage feed-forward (QVFF) circuit and integrated circuits using the same. The QVFF circuit includes a plurality of comparators in combination with a logic control circuit. The comparators are structured and arranged to establish various voltage threshold levels, each providing a digital state signal representative of the sensed input voltage level. The logic control circuit is structured and arranged to use the digital input signals from the comparators to output a voltage feed-forward factor (K | 11-19-2009 |
20090309555 | ELECTRICITY EFFICIENCY IMPROVING APPARATUS - A system and method for improving the electrical efficiency of an electrical load are provided. In an embodiment, a device is coupled to a load and its power source via an electrical conductor. The device optimizes the power delivered from the power source to the load by compensating or removing distortions in the matter wave of the electrical energy delivered from the power source. In some embodiments, the device employs infrared radiating materials that surround selected areas of the conductor. The infrared radiation may be of a wavelength and frequency that help restore the matter waves of the electrical energy and increase power factor of the load. Additionally, the device can be configured to modify the matter wave properties of the conductor itself to minimize its effects. For example, the infrared radiation emitted from the device may provide destructively interference energy that reduces vibrations of atoms inside the conductor. | 12-17-2009 |
20100109615 | Power Factor Correction Circuit And Method Of Driving The Same - The present invention relates to a power factor correction circuit and a method of driving the power factor correction circuit. The power factor correction circuit according to the present invention includes a power transfer element configured to receive an input voltage, an input current corresponding to the input voltage flowing through the power transfer element, and a switch connected to the power transfer element and configured to control an output voltage generated by the current flowing through the power transfer element. The power factor correction circuit is configured to detect a zero voltage edge timing of the input voltage by detecting the input voltage, generate a reference clock signal having a frequency that varies according to the detected edge timing, generate a reference signal using the reference clock signal, generate an error amplification signal based on a difference between the output voltage and a predetermined error reference signal, generate the amplification reference signal by multiplying the reference signal by the error amplification signal, and control a switching operation of the switch using the amplification reference signal and a detection signal corresponding to a current flowing through the switch. | 05-06-2010 |
20100176769 | CONTROL SYSTEM AND A METHOD OF CONTROLLING OF A TCSC IN AN ELECTRICAL TRANSMISSION NETWORK, USING IN PARTICULAR AN APPROACH OF THE LYAPUNOV TYPE - A system and method of controlling a TCSC disposed on a high voltage line of an electrical transmission network. The system comprises: (a) a voltage measuring module; (b) a current measuring module; (c) a regulator, working in accordance with a non-linear control law to receive on its input the output signals from the two modules for measuring voltage and current, and a reference voltage corresponding to the fundamental of the voltage which is to obtained across the TCSC; (d) a module for extracting the control angle in accordance with an extraction algorithm; and (e) a module for controlling the thyristors (T | 07-15-2010 |
20100176770 | Method and electricity generating installation for stabilizing an electricity distribution network - An electricity generating installation is connected to an electricity distribution network and feeds electrical power into the network via a converter. After detecting a network fault, a stabilization regulator in the installation is activated. The stabilization regulator regulates the voltage of the electrical power as a function of a fed-back voltage signal and has a step-function response that rises over time. After a predetermined time period has elapsed since the activation of the stabilization regulator, the reactive current feed is increased beyond a limit which is provided for normal operation if the network has not stabilized. Accordingly, a converter-fed electricity generating installation, such as a wind energy installation, can help stabilize an electricity distribution network after a network fault. | 07-15-2010 |
20100194357 | CONTROL SYSTEM AND A METHOD OF CONTROLLING OF A TCSC IN AN ELECTRICAL TRANSMISSION NETWORK, USING IN PARTICULAR AN APPROACH OF THE LYAPUNOV TYPE - A system and method of controlling a TCSC disposed on a high voltage line of an electrical transmission network. The system comprises: (a) a voltage measuring module; (b) a current measuring module; (c) a regulator, working in accordance with a non-linear control law to receive on its input the output signals from the two modules for measuring voltage and current, and a reference voltage corresponding to the fundamental of the voltage which is to obtained across the TCSC; (d) a module for extracting the control angle in accordance with an extraction algorithm; and (e) a module for controlling the thyristors (T | 08-05-2010 |
20100237834 | POWER GENERATION PLANT VOLTAGE CONTROL - A method for controlling a power generation plant may be provided. First, an equivalent grid voltage may be estimated based on electric magnitudes measured at a connection point of the power generation plant and an equivalent model of a power grid to which the power generation plant is connected. Then, on the basis of said estimated equivalent voltage, a command indicative of reactive power to be produced by the power generation plant may be generated. | 09-23-2010 |
20100253295 | SINGLE-PHASE AND THREE-PHASE DUAL BUCK-BOOST/BUCK POWER FACTOR CORRECTION CIRCUITS AND CONTROLLING METHOD THEREOF - The configurations of a single-phase dual buck-boost/buck power factor correction (PFC) circuit and a controlling method thereof are provided in the present invention. The proposed circuit includes a single-phase three-level buck-boost PFC circuit receiving an input voltage and having a first output terminal, a neutral-point and a second output terminal for outputting a first and a second output voltages, a single-phase three-level buck PFC circuit receiving the input voltage and coupled to the first output terminal, the neutral-point and the second output terminal, a first output capacitor coupled to the first output terminal and the neutral-point, a second output capacitor coupled to the neutral-point and the second output terminal, and a neutral line coupled to the neutral-point. | 10-07-2010 |
20100259229 | BATTERY CHARGING APPARATUS - A battery charger may be capable of receiving power from a power distribution circuit including a fuse and may be configured to reduce reactive power through the fuse caused by at least one load, other than the charger, electrically connected with the power distribution circuit. | 10-14-2010 |
20100289461 | BRIDGELESS POWER FACTOR CORRECTOR WITH LOGIC CONTROL - The present invention discloses a bridgeless active power factor corrector with a logic control comprising a high frequency switch controller, a boost inductor, an output filtering capacitor, two boost transistor modules, two boost diodes, two AC input voltage polarity detectors, and two low frequency switch drivers. With a coupling signal, the two AC input voltage polarity detectors respectively control the two low frequency switch drivers in conjunction with the high frequency switch controller to drive the two boost transistor modules with a logic control so that the inductor current releasing electric energy from the boost inductor can flow through the channels of the two boost transistor modules to effectively reduce the body diode conduction loss. | 11-18-2010 |
20100327821 | METHOD FOR CONTROLLING A VAR COMPENSATOR - In order to provide a method for regulating a reactive power compensator, which is connected to an alternating current line having multiple phases, wherein for each phase an actual voltage V | 12-30-2010 |
20100327822 | Distributed power supply system - During single operation of a distributed power supply system that has been disconnected from a commercial electric power system, a frequency increase monitoring circuit is operated and an instruction to output a larger amount of a constant reactive current is given to a reactive current controlling unit. After the output frequency of the distributed power supply exceeds a frequency increase level, the level of an active current is limited in accordance with the level of the outputted reactive current. | 12-30-2010 |
20110031940 | SYSTEM AND METHOD FOR POWER FACTOR CORRECTION FREQUENCY TRACKING AND REFERENCE GENERATION - A power factor correction (PFC) system includes a period determination module, a frequency generation module, an angle generation module, a signal generation module, and an angle correction module. The period determination module determines a period of an input alternating current (AC) line signal based on a time between rising edges of the input AC line signal. The frequency generation module generates a frequency based on the period. The angle generation module generates an angle based on the frequency. The signal generation module generates a sinusoidal reference signal based on the frequency and an adjusted angle. The angle correction module generates the adjusted angle based on the angle and based on a comparison of a falling edge of the sinusoidal reference signal, the period, and a rising edge of the input AC line signal. | 02-10-2011 |
20110031941 | SYSTEM AND METHOD FOR CURRENT BALANCING - A power factor correction (PFC) system includes a comparison module, an adjustment module, a compensation module, and a duty cycle control module. The comparison module measures N currents having different phases, and generates (N−1) comparisons based on the N measured currents, wherein N is an integer greater than one. The adjustment module determines (N−1) time advance adjustments based on the (N−1) comparisons, respectively. The compensation module generates N compensated versions of an input alternating current (AC) line signal based on the input AC line signal, a sinusoidal reference signal, and the (N−1) time advance adjustments, wherein the sinusoidal reference signal is synchronized to the input AC line signal in phase and frequency. The duty cycle control module controls PFC switching based on the N compensated versions of the input AC line signal. | 02-10-2011 |
20110031942 | SYSTEM AND METHOD FOR REDUCING LINE CURRENT DISTORTION - A power factor correction (PFC) system includes an adjustment module, a compensation module, and a duty cycle control module. The adjustment module generates N time advances based on N predetermined time advances and (N−1) time advance adjustments, wherein N is an integer greater than zero. The compensation module generates N compensated versions of an input alternating current (AC) line signal by predicting ahead of the input AC line signal using a gradient of a sinusoidal reference signal and the N time advances, respectively, wherein the sinusoidal reference signal is synchronized with the input AC line signal in phase and frequency. The duty cycle control module generates PFC duty cycles based on the N compensated versions of the input AC line signal. | 02-10-2011 |
20110031943 | SYSTEM AND METHOD FOR REJECTING DC CURRENT IN POWER FACTOR CORRECTION SYSTEMS - A power factor correction (PFC) system includes a direct current (DC) module, an error control module, an offset module, and a duty cycle control module. The DC module determines an average current value based on a plurality of current values over at least one cycle of an input alternating current (AC) line signal of the PFC system. The error control module generates an error signal based on the average current value. The offset module offsets a desired instantaneous current based on the error signal. The duty cycle control module controls at least one duty cycle of switches of the PFC system based on the offset desired instantaneous current. | 02-10-2011 |
20110089912 | DRIVER - A driver includes a sensor sensing a driving current and a driving voltage for an external device including a capacitor, a PWM, a PFC, and a controller. The PFC includes a phase angle estimation unit estimating a phase angle variation of an input voltage to the PFC based on a parameter regarding the driving current, a voltage compensator compensating an error of the driving voltage, a first current estimation unit estimating a variation of a charge of the capacitor based on the charge current and the phase angle variation estimated by the phase angle estimation unit, a second current estimation unit estimating a driving current variation, and a calculator calculating a duty ratio for the PWM based on the variation of the charge current estimated by the first current estimation unit and the driving current variation estimated by the second current estimation unit. | 04-21-2011 |
20110095730 | SWITCHED MODE POWER SUPPLY - A power supply includes a PFC stage | 04-28-2011 |
20110095731 | POWER FACTOR CORRECTION CONTROLLER, CONTROLLING METHOD THEREOF, AND ELECTRIC POWER CONVERTER USING THE SAME - A power factor correction controller is utilized for a power factor correction circuit in a critical conduction mode of an electric power converter. The power factor correction controller generates a control voltage according to an output voltage outputted from the electric power converter, and utilizes a first threshold value to detect the control voltage. The power factor correction controller can control the power factor correction circuit to operate in different modes according to various levels of a load. Therefore, an objective according to the present invention for reducing electric power consumption of the electric power converter in a light load or a no-load mode and improving energy transmission efficiency can be attained. | 04-28-2011 |
20110215774 | AC POWER CONTROL WITH INTEGRAL POWER FACTOR CORRECTION - Device and method for high efficiency (low heat loss) control of AC power to reactive load while maintaining a high power factor. | 09-08-2011 |
20110215775 | DIRECT POWER CONTROL WITH COMPONENT SEPARATION - The invention relates to a method to control power output of a doubly-fed induction machine to a grid including the steps of measuring grid voltage and grid current in a three phase coordinate system, transforming grid voltage and grid current into a stator frame coordinate system, decomposing the grid voltage and grid current in the stator frame coordinate system in a positive sequence system and in a negative sequence system, calculating active and reactive power in the positive and negative sequence system, and controlling active and reactive power in the positive and negative sequence system. The object to provide a method to control power output of a doubly-fed induction machine which provides good dynamics and is able to allow fault-ride-through operations when unbalanced grid voltages occurs is solved in that active and reactive power in the positive and negative sequence system are used as independent state variables in a state controller, whereas the state controller generates manipulated values in the positive and negative sequence system separately which are subjected as manipulated state vectors to a state feedback in a stator frame coordinate system without further control loops before the manipulated vector resulting from state feedback is used to set the rotor voltage. | 09-08-2011 |
20110221401 | Power Factor Compensating Method - An approach is provided for a power factor compensating method to compensate other electronic devices that use a common power source in order to improve power factor from the perspective of a power company. The other electronic device is a type of a non-linear load, and the method enables a compensator to receive a supply voltage from the power source commonly connected to the traditional electronic devices and disables a load of the compensator for a period. The period corresponds to a range that makes an overall supply current more proportional to the supply voltage. | 09-15-2011 |
20110285362 | REACTIVE POWER MANAGEMENT - Embodiments of the invention relate to devices and methods and systems for controlling a reactive power contribution to reactive power flowing in an electricity distribution network, so as to optimise this reactive power flow. Conventional methods of controlling reactive power flow focus on minimising a reactive power contribution by power provision and power consumption devices connected to the electricity distribution network, in accordance with, for example, regulations governing a maximum allowed power factor and/or under the control of a central controlling entity. However, such methods are slow to react to changing network conditions, and do not take account of local variations in reactive power. In an embodiment of the present invention, there is provided a reactive power control device for use with a power consumption and/or provision device. The reactive power control device comprises detecting means for detecting, at the power device, a reactive power characteristic of electrical power flowing in the electric power distribution network, the reactive power characteristic relating to a reactive power component of electricity flowing in the network. The reactive power control device further comprises control means for controlling, on the basis of the detected reactive power characteristic a reactive power contribution to the electricity distribution device so as to adjust a value of the detected reactive power characteristic. This enables individual power consumption and/or provision devices to react autonomously to local variations in the electricity distribution network, and to provide a reactive power contribution, to drive the detected reactive power characteristic towards a desired value. | 11-24-2011 |
20110316491 | METHOD AND APPARATUS TO INCREASE EFFICIENCY IN A POWER FACTOR CORRECTION CIRCUIT - A power factor correction (PFC) controller includes a first integrator coupled to integrate an input current of a PFC converter. A first signal is generated in response to the first integrator to end an on time of a power switch of the PFC converter. A second integrator is coupled to integrate a difference between a constant voltage and an input voltage of the PFC converter. A second signal is generated in response to the second integrator to end an off time of the power switch of the PFC converter. A driver circuit is coupled to vary the switching frequency of the power switch of the PFC converter in response to the first and the second signals and to output a third signal to switch the power switch of the PFC converter to control the input current to be substantially proportional to the input voltage. | 12-29-2011 |
20110316492 | Control Device Reactive Power Compensator And Method - A control device for controlling a reactive power compensator connected to an electric power network and arranged to provide reactive power to the electric power network. The control device includes a voltage regulator outputting a control signal to the reactive power compensator for controlling its supply of susceptance to the electric power network. The control device includes a gain-adjusting device arranged to adjust the gain of the voltage regulator relative to the point of operation of the reactive power compensator. | 12-29-2011 |
20120001599 | Power Supply Circuit Capable of Handling Direct Current and Alternating Current and Power Supply Control Method - According to one embodiment, a power supply circuit includes an input terminal, a rectifier circuit, a power factor improvement circuit, a DC/DC converter, and a control module. The DC/DC converter converts the level of a DC voltage output from the power factor improvement circuit. The control module determines on the basis of the output voltage of the rectifier circuit whether an input power supply supplied to the input terminal is AC or DC. The control module generates a DC power supply by use of the power factor improvement circuit and DC/DC converter when the input power supply is AC and generates a DC power supply by controlling the operation of the power factor improvement circuit and DC/DC converter according to the voltage of input DC power supply when the input power supply is DC. | 01-05-2012 |
20120086411 | Switching Power Supply Circuit with Reduced Total Harmonic Distortion - A switching power supply circuit has a control circuit for current-mode on-off control of a primary switch connected to an inductor in a voltage boost topology for operation in boundary-conduction mode. The time at which the primary switch is opened is determined by magnitude of current flowing through the primary switch together with the instantaneous voltage present on an AC input to the power supply circuit. The time at which the primary switch is closed is determined by demagnetization of the inductor. An improvement to the foregoing switching power supply circuit comprises a maximum-on-time enforcement circuit to limit the maximum possible primary switch on-time to a predetermined maximum period of time. The enforcement circuit provides a signal to the control circuit to cause termination of the primary switch on-state if and only if the primary switch has been turned on for more than the predetermined maximum period of time. | 04-12-2012 |
20120112711 | POWER FACTOR CONTROLLER WITH ERROR FEEDBACK, AND A METHOD OF OPERATING SUCH A POWER FACTOR CONTROLLER - A power factor controller is disclosed, in which error feedback is provided my means of a parallel combination of at least two error feedback channels. By providing at least two error feedback channels, the stability associated with, for instance, a continuously integrated feedback loop with relatively long time constant, may be combined with a fast transient response associated with, for instance, a sample-and-hold error feedback. | 05-10-2012 |
20120126759 | POWER CONVERSION CONTROLLER HAVING A NOVEL POWER FACTOR CORRECTION MECHANISM - A power conversion controller having a novel power factor correction mechanism, including: a normalization unit, used to generate a normalized signal according to a line voltage by multiplying the line voltage with a normalizing gain, wherein the normalizing gain is proportional to the reciprocal of the amplitude of the line voltage; a reference current generation unit, coupled to the normalization unit to generate a reference current signal by performing an arithmetic operation, wherein the arithmetic operation involves the normalized signal; and a gate drive signal generation unit, used to generate a gate drive signal, wherein the duty of the gate drive signal is determined by a voltage comparison of the reference current signal and a current sensing signal. | 05-24-2012 |
20120176101 | Power Factor Correction Device - Disclosed is a PFC (power factor correction) device for shaping an input current of a power converter. The device includes means for receiving a rectified input voltage derived from an AC input voltage; load determining means for determining a load value L which represents the power drawn by a load supplied by the power converter; current shaping means for shaping the input current of the power converter to follow a reference waveform; and control means for controlling the current shaping means to operate over a conduction interval α during each positive and negative half cycle of the AC input voltage. The duration of the conduction interval is controlled in accordance with the load value L. The current shaping means may shape the input current to follow the reference waveform which crosses zero at phase angles which substantially correspond to the start and end of the conduction interval. | 07-12-2012 |
20120187924 | METHOD FOR CONTROLLING CURRENT CONVERTERS AND ASSEMBLY FOR PERFORMING SAID METHOD - A method for the closed-loop control of current converters for adjusting the counter-voltage in a multi-phase electric energy transmission network having a multi-phase connection line. In order to be parameterize in various operating states, phase currents are registered on the connection line and transformed into system current components by way of transformation, voltages are registered on the phases of the connection line, and counter-system voltage components are formed therefrom by way of transformation, which are supplied to a voltage controller. Counter-system current components serving to reduce the counter-system are formed in the voltage controller, which are supplied to a target value input of a current controller. System current components are connected to an actual value input of the current controller, the output parameters thereof serving after retransformation as switching currents for switching units of the current converter. | 07-26-2012 |
20120212191 | METHOD FOR CONTROLLING POWER FACTOR OF THREE-PHASE CONVERTER, METHOD FOR CONTROLLING REACTIVE POWER OF THREE-PHASE CONVERTER, AND CONTROLLER OF THREE-PHASE CONVERTER - In power conversion according to the three-phase converter, symmetrical component voltage values of a balanced system are calculated from wye-phase voltages on the three-phase AC input side of the three-phase converter. On the DC output side thereof, the power factor is set, an average active power value is calculated from an output voltage value and an output current value, and an average reactive power is calculated from the set power factor. On the basis of the symmetrical component voltage values, the average active power, and the active reactive power, a compensation signal for compensating for unbalanced voltages of the three-phase AC voltages and a control signal for controlling the power factor are generated, and according to the compensation signal and the control signal, a control signal for outputting DC is generated. | 08-23-2012 |
20120217938 | MULTI-PATH POWER FACTOR CORRECTION - A method of multi-path power factor correction includes providing a plurality of energy transfer paths from a voltage-varying input to an output; delivering a first fraction of available input energy to one or more energy storage networks at the input of at least one of the plurality of energy transfer paths; delivering a second fraction of available input energy to the output; and adjusting the first fraction and second fraction for facilitating outputting a substantially constant output and for controlling the energy drawn from the input. | 08-30-2012 |
20120242297 | POWER SUPPLY - A power supply includes an integrated cable manager board. The integrated cable manager board is configured to integrate elements of the power supply on the integrated cable manager board. The integrated cable manager board includes a circuit monitoring device and a plurality of connectors. The circuit monitoring device is disposed on the integrated cable manager board and monitors the circuit status of the power supply. The connectors are disposed on the integrated cable manager board and each of the connectors is operable to provide power. | 09-27-2012 |
20120286745 | DIGITAL POWER FACTOR CORRECTION DEVICE - A digital power factor correction device is provided, which is an all-digital control module. The digital power factor correction device includes a voltage loop control unit, an input power control unit, a current loop control unit, and a pulse width modulation generation unit, to perform power factor correction for minimizing the phase difference between input current and input voltage through adjusting input current with an external driver and a switch unit. The voltage loop control unit and the current loop control unit contain proportion-integral-differentiation controller to form voltage control loop and current control loop, respectively. The input power control unit adjusts current waveform according to the input power, while the pulse width modulation generation unit decides stop time of pulse width modulation to produce a pulse width modulation signal, to control the external driver and the switch unit for eliminating loading effect. | 11-15-2012 |
20130009613 | Inductive Load Power Switching Circuits - Power switching circuits including an inductive load and a switching device are described. The switches devices can be either low-side or high-side switches. Some of the switches are transistors that are able to block voltages or prevent substantial current from flowing through the transistor when voltage is applied across the transistor. | 01-10-2013 |
20130021005 | SINGLE-STAGE POWER SUPPLY WITH POWER FACTOR CORRECTION AND CONSTANT CURRENT OUTPUT - An example controller for providing power factor correction and a constant current output in a power supply includes a means for generating a delayed ramp signal and a means for integrating an input current sense signal representative of an input current and for generating an input charge signal in response thereto. The controller also includes a means for determining a ratio of an input voltage sense signal to an output voltage sense signal and for generating an input charge control signal responsive to the input charge signal and the ratio of the input voltage sense signal to the output voltage sense signal. A means for comparing the input charge control signal to the delayed ramp signal to generate a drive signal to control a switch of the power supply is also included. | 01-24-2013 |
20130043846 | METHODS AND APPARATUS TO IMPROVE POWER FACTOR AT LIGHT-LOAD - Methods and apparatus to improve power factor are disclosed. An example method includes detecting power provided to a power factor corrector; detecting power provided by the power factor corrector; and disabling the power factor corrector from correcting a power factor of a load for at least one period when the power provided by the power factor corrector is below a light-load threshold. | 02-21-2013 |
20130141056 | ADAPTIVE FREQUENCY COMPENSATION FOR PFC POWER CONVERTER OPERATING IN CCM AND DCM - A control circuit of a power factor correction (PFC) converter is provided. The control circuit includes a pulse width modulation (PWM) circuit, an amplifier, a detection circuit., and a capacitor. The PWM circuit generates a switching signal in response to a loop signal. The amplifier is coupled to generate the loop signal in response to a switching current. The detection circuit generates a mode signal coupled to change output impedance of the amplifier. The capacitor is coupled to the amplifier for loop frequency compensation. The switching signal is coupled to switch an inductor of the PFC power converter and generate the switching current. | 06-06-2013 |
20130162224 | Digitally-Controlled Power Factor Correction Circuits, Methods and Articles of Manufacture - Digitally-controlled power factor correction circuits, methods, and articles of manufacture are disclosed. A disclosed power supply comprises a power factor correction circuit including a switch, an inductor having a first terminal connected to an input voltage, and a second terminal connected to the switch, a storage capacitor and a load, a value of the inductor selected to operate the power factor correction circuit in discontinuous conduction mode, and a controller programmed to operate the switch to increase a power factor of the power supply. | 06-27-2013 |
20130176003 | ELECTRICAL INSTALLATION - An electrical installation of an arc furnace for melting metals may include a power factor correction unit and a control unit for driving the power factor correction unit, wherein at least one control parameter is variable within a predetermined control parameter range. In this case, a restricted control parameter subrange is predetermined for the control parameter and the electrical installation comprises an operating unit, by means of which the control parameter is adjustable within the control parameter subrange. Thus, the flexibility of the electrical installation may be increased and the operator may have more room for manoeuvre with respect to operation and maintenance of the installation in comparison with conventional arrangements. | 07-11-2013 |
20130207621 | POWER FACTOR CORRECTION CIRCUIT - A power factor correction circuit includes a first series circuit, a second series circuit, a smoothing capacitor, and a reactor. The power factor correction circuit further includes an input voltage detector that detects an input voltage of at least one end of an AC power source based on one end on a ground side of the smoothing capacitor, and a current detector that detects a reactor current from the AC power source, the current detector having a transformer in which the reactor is a primary side, and first and second switching elements are controlled based at least partially on a reactor current detection signal that is output in accordance with the reactor current from a secondary side of the transformer to supply a desired DC voltage to a load circuit. | 08-15-2013 |
20130221936 | POWER FACTOR CORRECTION DEVICE AND CORRECTING METHOD THEREOF - A power factor correction device comprises a power stage circuit converting input alternating current voltage into input current according to a pulse width modulation signal and outputs the input current to a load generating output voltage on the load, and sampling the input current outputting a correcting current; a current compensating circuit receiving and comparing the correcting current with a reference current signal generating a compensating current signal; a voltage compensating circuit receiving and comparing the output voltage with a reference voltage generating a compensating voltage signal; a multiplication amplifier receiving the compensating current signal and the compensating voltage signal generating an updated reference current signal by multiplying the compensating current signal with the compensating voltage signal; and a pulse width modulation converter receiving the compensating current signal and the compensating voltage signal generating the pulse width modulation signal to synchronize phase of alternating current voltage and input current. | 08-29-2013 |
20130249503 | METHOD FOR AUTOMATICALLY RE-PHASING THE CURRENT OF A DOMESTIC ELECTRICAL NETWORK | 09-26-2013 |
20130257390 | POWER FACTOR CORRECTION CIRCUIT - A power factor correction (PFC) circuit includes an AC power, a first bridge arm and a second bridge arm. The first bridge arm includes first and second switches connected in series with each other. A second terminal of the first switch is connected to a first terminal of the second switch, and coupled to a first end of the AC power via a first inductor. The second bridge arm includes third and fourth switches connected in series with each other. A second terminal of the third switch is connected to a first terminal of the fourth switch and a second end of the AC power. The third and fourth switches operate in ON/OFF states by use of a control signal having an operation frequency consistent with that of the AC power. The on-state resistance of the third and fourth switches is lower than that of the first or second switch. | 10-03-2013 |
20130300381 | POWER CONVERTER APPARATUS - A power converter apparatus for driving an electronic load is disclosed. The power converter apparatus includes a rectifier module, an active switch unit, a driving module, an input voltage detection module, an output voltage detection module, a current detection module and a digital processor module. The active switch unit is shunt connected to the electronic load. The input voltage detection module is used for sampling out an input sampled voltage waveform. The output voltage detection module is used for sampling out an output sampled voltage waveform. The current detection module is used for sampling o out a practical input current waveform. The digital processor module generates a current reference command according to the input sampled voltage waveform and the output sampled voltage waveform. The digital processor module dynamically switches the active switch unit according to the current reference command and the practical input current waveform. | 11-14-2013 |
20130307494 | ON-LOAD TAP-CHANGER CONTROL METHOD, EXCITATION CONTROL SYSTEM CARRYING OUT SAID CONTROL METHOD AND POWER EXCITATION CHAIN - The present invention relates to an on-load tap changer control method for a power transformer in a power system. The power transformer has a primary side for a connection to a first grid in which electric power is generated, and a secondary side for connection to a second grid in which electrical power is consumed, the power transformer being equipped with an on-load tap changer. The method includes measuring the voltage and current at least on the primary side (u | 11-21-2013 |
20130314056 | POWER FACTOR CORRECTION APPARATUS - A power factor correction apparatus is applied to an alternating-current voltage apparatus and a rear end circuit. The power factor correction apparatus includes a power factor correction unit, a control unit, and a ripple detecting unit. The power factor correction unit is electrically connected to the rear end circuit and the alternating-current voltage apparatus. The control unit is electrically connected to the power factor correction unit. The ripple detecting unit is electrically connected to the rear end circuit, the power factor correction unit, and the control unit. The control unit is informed by the ripple detecting unit to control the power factor correction unit to adjust the power factor after the ripple of the signal outputted from the power factor correction unit is detected by the ripple detecting unit. | 11-28-2013 |
20130320939 | INDUCTIVE LOAD POWER SWITCHING CIRCUITS - Power switching circuits including an inductive load and a switching device are described. The switches devices can be either low-side or high-side switches. Some of the switches are transistors that are able to block voltages or prevent substantial current from flowing through the transistor when voltage is applied across the transistor. | 12-05-2013 |
20140002033 | Bridgeless Power Factor Correction Circuit and Control Method Thereof | 01-02-2014 |
20140097806 | Apparatus and Method for Improving Power Factor - An apparatus, a method, and a computer program product are provided. The apparatus determines an input voltage and an input current of a power system driving a low power factor load, the input voltage varying based on a power cycle, determines at least a first portion of the power cycle at which the input current exceeds a threshold, and couples at least one substantially resistive load to the low power factor load during at least a second portion of the power cycle different from the at least a first portion of the power cycle. | 04-10-2014 |
20140097807 | Methods and Systems for Mitigation of Intermittent Generation Impact on Electrical Power Systems - Methods and systems for mitigation of intermittent generation impact on electrical power system may be provided. A voltage of the power line may be monitored. A change in the voltage of the power line may be determined. A power output of an energy generation source connected to the power line may be altered based on the determined change in the voltage on the power line to compensate for the change in the voltage. | 04-10-2014 |
20140103885 | MAXIMUM POWER POINT TRACKING - A method and an arrangement of tracking a selected (e.g., maximum) power point of a photovoltaic system is disclosed, in which method an operation point of the photovoltaic system is changed based on the change of operation point and a change of power generated by the photovoltaic system. The method can include repeatedly determining a current or voltage of the photovoltaic system, determining a power of the photovoltaic system, determining a change of power of the photovoltaic system with respect to a previous determined power, and changing the operation point of the photovoltaic system by changing a current or voltage reference of the system stepwise depending on the change of power and a direction of a previous change of the current or voltage reference. | 04-17-2014 |
20140117947 | SIGNAL PEAK DETECTOR AND DETECTION METHOD, AND CONTROL IC AND METHOD FOR A PFC CONVERTER - A control integrated circuit for a power factor correction converter has a pin for detecting an alternating-current information and a direct-current information of an input signal. The control integrated circuit comprises a signal peak detector for detecting a peak value of the input signal to the pin to obtain the direct-current information of the input signal. Since the alternating-current information and the direct-current information of the input signal can be obtained through the same pin, the pin count of the control integrated circuit can be decreased. | 05-01-2014 |
20140125297 | BRIDGELESS POWER FACTOR CORRECTOR WITH SINGLE CHOKE AND METHOD OF OPERATING THE SAME - A bridgeless power factor corrector with a single choke is electrically connected to an AC power source. The bridgeless power factor corrector includes a choke element, a first switch, a second switch, a first diode, a second diode, a capacitor, a first rectify diode, and a second rectify diode. The choke element is electrically connected between the first switch and the second switch. The first switch and the second switch are controlled to be turned on or turned off by a first control signal and a second control signal, respectively, to provide a power factor correction for the AC power source when the AC power source is in a positive half cycle or a negative half cycle. Furthermore, a method of operating the bridgeless power factor corrector is provided. | 05-08-2014 |
20140210427 | Dynamic High Energy Switch - A dynamic high-energy switch used for correcting load imbalance through connecting and disconnecting capacitance in a power feed circuit. | 07-31-2014 |
20140232357 | REACTIVE POWER MANAGEMENT - Methods and systems for controlling a reactive power contribution to reactive power flowing in an electricity distribution network, so as to optimise this reactive power flow are described. A reactive power characteristic of electrical power flowing in the electricity distribution network is detected at a power device. The reactive power characteristic relates to a reactive power component of electricity flowing in the network. On the basis of the detected reactive power characteristic a reactive power contribution to the electricity distribution network is controlled so as to adjust a value of the detected reactive power characteristic. This enables individual power consumption and/or provision devices to react autonomously to local variations in the electricity distribution network, and to provide a reactive power contribution, to drive the detected reactive power characteristic towards a desired value. | 08-21-2014 |
20140253056 | Power Supply with Adaptive-Controlled Output Voltage - A power supply circuit includes a pre-regulator configured to receive an input voltage and to generate an output voltage, and a switching current regulator coupled to an output of the pre-regulator and configured to regulate a level of current supplied to an output load. The switching current regulator is controlled by a switching signal having a duty cycle. The circuit further includes a controller that generates the switching signal. The controller monitors the duty cycle of the switching signal and controls a level of the output voltage generated by the pre-regulator by providing a control signal in response to the duty cycle of the switching signal. | 09-11-2014 |
20140266081 | ADAPTIVE ADJUSTMENT TO OUTPUT RIPPLE IN A DEAD ZONE - An embodiment relates to a method for adjusting a dead zone, wherein an amplitude of an oscillating signal is determined, and wherein the dead zone is adjusted based on the amplitude of the oscillating signal. | 09-18-2014 |
20140266082 | METHOD AND IMPLEMENTATION FOR ELIMINATING RANDOM PULSE DURING POWER UP OF DIGITAL SIGNAL CONTROLLER - A switching mode power converter includes a DSC with a digital PWM module configured for complementary operation mode during normal operation. The control algorithm of the DSC is configured such that during an initialization stage immediately following power up of the device relevant digital PWM modules used for interleaving operation are reconfigured to temporarily operate in an independent operation mode with the duty cycle associated with each channel set at zero. The reconfigured digital PWM modules remain set in the independent operation mode for a predefined period of time. Once the predefined time period is reached, the reconfigured digital PWM modules are again reconfigured back to the original complementary operation mode configuration and the control algorithm resumes normal operation of the DSC and digital PWM modules. | 09-18-2014 |
20140285163 | HIGHLY EFFICIENT PFC CIRCUIT AND CONTROL METHOD THEREOF - A PFC circuit includes: a switching circuit having a power switch; an on time control circuit for controlling an on time period of the power switch; a first off time control circuit; a second off time control circuit; and a logic circuit selectively controls the power switch working under CCM or DCM; when working under CCM, the first off time control circuit controls an off time period of the power switch and when working under DCM, the second off time control circuit controls the off time period of the power switch. | 09-25-2014 |
20140292287 | CASCODE SEMICONDUCTOR DEVICE - A semiconductor device, comprising first and second field effect transistors arranged in a cascode configuration: wherein the first field effect transistor is a depletion mode transistor; and wherein the second field effect transistor comprises a first source to gate capacitance and a second additional source to gate capacitance connected in parallel to the first source to gate capacitance. A power factor correction (PFC) circuit comprising the semiconductor device. A power supply comprising the PFC circuit. | 10-02-2014 |
20140347020 | METHOD AND ARRANGEMENT FOR FEEDING ELECTRICAL POWER FROM A WIND ENERGY INSTALLATION INTO AN AC VOLTAGE SYSTEM - Electrical power is fed from a wind energy installation into an AC voltage system via an energy transmission path, which is delimited by an installation-side transformer and a system-side transformer. A power factor correction device is connected, at a common node between the energy transmission path and the AC voltage system using a closed-loop control device, which controls the wind energy installation and which receives a variable which is proportional to the reactive power on the energy transmission path and a further measured variable. A measurement signal produced at the output of the power factor correction device is used as further measured variable. The closed-loop controller has such a control characteristic that the voltage on the low-voltage side of the system-side transformer increases, depending on the reactive power on the energy transmission path, from the inductive range to the capacitive range. | 11-27-2014 |
20140354245 | SYSTEM, A METHOD AND A COMPUTER PROGRAM PRODUCT FOR CONTROLLING ELECTRIC POWER SUPPLY - A method for controlling electric power supply, the method comprising: (a) controllably down converting by a step-down power converter entry voltage from a power source and preventing up-conversion by a step-up power converter, substantially when the entry voltage is larger than a measured exit voltage and is in compliance with a first criterion that is based on the entry voltage and on the measured exit voltage; wherein the measured exit voltage is measured at an exit of both step-up power converter and the step-down power converter; and (b) controllably up converting by the step-up power converter the entry voltage and preventing down-conversion by the step-down power converter, substantially when the entry voltage is lower than the measured exit voltage and is in compliance with a second criterion that is based on the entry voltage and on the measured exit voltage. | 12-04-2014 |
20140375283 | CONTROLLING METHOD AND SYSTEM FOR SUPPORTING ACTIVE POWER FACTOR CORRECTION LOADS - The present invention relates to a control method for supporting active power factor correction (APFC) loads, comprising: providing square wave width of an output voltage waveform to be a comparatively large value to improve effective value of the output voltage, in order to meet the requirements for active power factor correction (APFC) loads; and gradually decreasing square wave width of the output voltage waveform from the comparatively large value to a comparatively small value to gradually decrease effective value of the output voltage to a desirable stable voltage effective value. The present invention further relates to a control system for supporting active power factor correction (APFC) loads, comprising: a voltage increasing unit for providing square wave width of an output voltage waveform to be a comparatively large value to improve effective value of the output voltage, in order to meet the requirements for active power factor correction (APFC) loads; and a voltage stabilizing unit for adjusting square wave width to a comparatively large value, and gradually decreasing square wave width of the output voltage waveform from the comparatively large value to a comparatively small value to gradually decrease effective value of the output voltage to a desirable stable voltage effective value. | 12-25-2014 |
20150022163 | PFC CIRCUIT - In one embodiment, a power factor correction (PFC) circuit can include: (i) a rectifier bridge and a PFC converter coupled to an input capacitor; (ii) a harmonic wave compensation circuit configured to shift a phase of a DC input voltage provided from the rectifier bridge, where the harmonic wave compensation circuit comprises a phase of about −45° when a corner frequency is about 50 Hz; and (iii) a PFC control circuit configured to control the PFC converter, where the PFC control circuit comprises a first sampling voltage, and the harmonic wave compensation circuit is configured to control a phase of the first sampling voltage to lag a phase of the DC input voltage by about 45°. | 01-22-2015 |
20150054473 | REACTIVE POWER COMPENSATION DEVICE HAVING FUNCTION OF DETECTING SYSTEM IMPEDANCE - In a reactive power compensation device, a control unit controls a magnitude of reactive power to be output by a reactive power output unit, based on a detected system voltage and one or more control parameters in a first operation mode. In a second operation mode, the control unit changes the magnitude of the reactive power to be output by the reactive power output unit to a power system in an output change period, calculates system impedances of the power system at a plurality of detection time points within the output change period, based on change amounts of the system voltage detected at the plurality of detection time points and corresponding change amounts of the reactive power, and, when a variation in the calculated system impedances is within an acceptable range, adjusts the one or more control parameters, based on the calculated system impedances. | 02-26-2015 |
20150069978 | VOLTAGE CONTROL APPARATUS, VOLTAGE CONTROL METHOD, AND POWER ADJUSTMENT APPARATUS - A voltage control apparatus includes: a voltage value obtainment unit configured to obtain voltage values at the one or more voltage measuring points; an impedance obtainment unit configured to obtain a system impedance from a distribution substation to each of power adjustment apparatuses; a control variable calculating unit configured to calculate a control variable including at least one of (i) a value corresponding to an allowable upper limit of a voltage value at the first voltage measuring point and (ii) a value corresponding to an allowable lower limit of the voltage value at the first voltage measuring point, based on the voltage values at the one or more voltage measuring points and the system impedances; and a notification unit configured to notify the power adjustment apparatuses of the calculated control variable. | 03-12-2015 |
20150069979 | POWER SUPPLIES AND CONTROL METHODS CAPABLE OF IMPROVING POWER FACTOR DURING LIGHT LOAD - An apparatus is capable of improving the power factor of a power supply powered by a high power line and a ground power line. The apparatus comprises a line voltage detector and an ON time controller. The line voltage detector provides a scaled voltage to represent a line voltage of the high power line. The ON time controller has a valley voltage detector, which provides, in response to the scaled voltage, a valley representative representing a valley voltage of the line voltage. The ON time controller controls an ON time of a power switch in the power supply in response to the valley representative. | 03-12-2015 |
20150077068 | VOLTAGE FLUCTUATION SUPPRESSING APPARATUS - According to an embodiment, a voltage fluctuation suppressing apparatus is provided with a power storage device connected to an electric power system, a basic control unit to control an output of the power storage device, a voltage detector to measure a voltage of a connection point to the electric power system, and an output control unit to divide a control amount to be outputted to the basic control unit into a reactive power command value and an active power command value and to output them. The output control unit is provided with a reactive power upper limit value calculation unit, a reactive power calculation/output unit, and an active power calculation/output unit. | 03-19-2015 |
20150102785 | Dynamic High Energy Switch - A dynamic high-energy switch used for correcting load imbalance through connecting and disconnecting capacitance in a power feed circuit. | 04-16-2015 |
20150108952 | COMPENSATION OF REACTIVE POWER AT A SUBSEA AC TRANSMISSION CABLE HAVING AN OFF-SHORE INPUT END AND AN ON-SHORE OUTPUT END - A transmission system and a method for transmitting electrical power which has been produced by at least one off-shore wind turbine to a utility grid being located on-shore is provided. The transmission system has (a) an off-shore transformer, which is connectable to the at least one wind turbine and which is configured for changing a first AC voltage level provided by the at least one wind turbine to a second AC voltage level, (b) a subsea AC transmission cable having an off-shore input end and an on-shore output end, wherein the input end is connected to the off-shore transformer, and (c) a compensation unit for compensating at least partially a reactive power being produced within the subsea AC transmission cable, wherein the compensation unit is electrically coupled to the subsea AC transmission cable at a node being located in between the off-shore input end and the on-shore output end. | 04-23-2015 |
20150123626 | POWER CONTROL APPARATUS, POWER CONTROL METHOD, AND POWER CONTROL PROGRAM - A power control apparatus includes: a first obtainment unit which obtains a power flow value at a power flow measuring point and a voltage value at a voltage measuring point provided; a power flow control unit which calculates a first power change value, to cause the power flow value to approach a predetermined target value; a voltage control unit calculates a voltage value at the voltage measuring point when the first power has been changed by the first power change value, and sets a second power change value, based on whether or not the voltage value falls within a predetermined voltage range; and a notification unit which notifies the power adjustment apparatus of a command value for causing the power adjustment apparatus to input or output the first power changed by the first power change value and the second power changed by the second power change value. | 05-07-2015 |
20150137772 | POWER FACTOR CORRECTION SUB-SYSTEM FOR MULTI-PHASE POWER DELIVERY - Systems and methods are disclosed for providing power factor correction (“PFC”) for multi-phase power delivery. A PFC sub-system can include multiple active PFC modules and multiple isolated DC-to-DC converters. Each active PFC module can increase a respective power factor associated with a respective phase of the multi-phase power system. Each DC-to-DC converter can be electrically connected to a respective active PFC module. Each isolated DC-to-DC converter can modify a respective DC voltage level for a respective DC voltage received from a respective active PFC module. Outputs of the isolated DC-to-DC converters are electrically connectable for providing a combined voltage or combined current to a load device. The combined voltage or combined current corresponds to the voltages received by the DC-to-DC converters from the active PFC modules. | 05-21-2015 |
20150349629 | MULTI-FUNCTION POWER REGULATOR FOR PRIORITIZING FUNCTIONS AND ALLOCATING RESOURCES THEREOF - A multi-function power regulator for prioritizing functions and allocating resources thereof, the multi-function regulator including a plurality of resources each having a resource capacity limit. The multi-function regulator also includes a shunt converter is configured to perform one or more shunt converter functions while consuming one or more of the resources, a series converter is configured to perform one or more series converter functions while consuming one or more of the resources. A control engine coupled to the shunt converter, the series converter, and a plurality of sensors, the control engine is configured to monitor and control the one or more shunt converter functions and the one or more series converter functions. The multi-function regulator also includes a priority control engine coupled to the control engine, the priority control engine is configured to set a priority order for performing the one or more shunt converter functions and/or the one or more series converter functions and configured to determine whether one or more resource capacity limits has been exceeded or not exceeded by the shunt converter functions and/or the series converter function and in response to one or more exceeded resource capacity limits adjust the operation of the shunt converter functions and/or the series converter based on the priority order such that the one or more resource capacity limits exceeded is no longer exceeded. | 12-03-2015 |
20160087524 | GENERATION OF DRIVE CURRENT INDEPENDENT OF INPUT VOLTAGE - Systems and methods to generate drive current in a power supply, independent of the input voltage, are provided. The power supply includes front end circuitry, control circuitry, and drive circuitry. The front end circuitry includes protection circuitry to defend against damage from EMI, voltage spikes, and the like. The control circuitry includes startup circuitry, power factor correction (PFC) circuitry, and output power configuration circuitry. The startup circuitry provides operational voltage to the PFC circuitry, derived from an input voltage, until an internally generated operational voltage becomes available. The PFC circuitry uses the operational voltage to generate output power for the drive circuitry based on the output power configuration circuitry. The drive circuitry includes drive current configuration circuitry to generate a drive current to drive a load, coupled to the power supply, independent of the input voltage. | 03-24-2016 |
20160094141 | SINGLE CONVERSION STAGE BIDIRECTIONAL SOFT-SWITCHED AC-TO-AC POWER CONVERTER - A single conversion stage bidirectional soft-switched AC/AC power converter system is capable of converting power in both directions between high- and low-voltage sources. The system has substantially loss-less switching and regulated output in both directions of power transfer. The semiconductor and electro-magnetic components of the system provide both output regulation and soft switching in both the step-up and the step-down directions of power conversion. The commonality of components between the two directions of power transfer reduces total component count, cost and volume, and enhances power conversion efficiency. An associated method of power transfer employs structural symmetry in a resonant circuit of the system to ensure high efficiency line power transfer in both directions. | 03-31-2016 |
20160105095 | PFC SHUTDOWN CIRCUIT FOR LIGHT LOAD - A power converter includes a front end stage having a power factor correction controller, an output stage with a DC/DC controller, and light load detection circuitry coupled to detect relatively low power consumption by a load on an output of the output stage. In response to the detection, the power factor correction controller in the front end stage is turned off. | 04-14-2016 |
20160118878 | Overall Dynamic Reactive Power Control In Transmission Systems - There is provided a method of stabilizing the voltage and reducing power losses in an electric network having a flow of live current and a flow of reactive power, the method comprising reducing the flow of live current by controlling the flow of reactive power within the network. There is also provided an electric network node having a first load point and a second load point, the second load point being at a lower load level than the first load point, the node comprising a reactive power absorber at the first load point and a reactive power generator at the lower load point. An electric network comprising a first substation comprising a first load bus-bar having a first voltage and a second load bus-bar having a second voltage lower than the first voltage; second substations in connection with the first substation, each one comprising a third load bus-bar having a third voltage equal to the second voltage and a fourth load bus-bar having a fourth voltage lower than the third voltage; a reactive power absorber connected to the second load bus-bar; and for each one of the second substations, a reactive power generator connected to the fourth bus-bar. | 04-28-2016 |
20160204693 | TWO-STAGE CLOCKED ELECTRONIC EVERGY CONVERTER | 07-14-2016 |
20160254742 | PFC Current shaping | 09-01-2016 |
20160254743 | PFC CIRCUIT | 09-01-2016 |
20160380529 | PULSE WIDTH MODULATION CONTROLLER ARCHITECTURES - Systems, apparatuses, and techniques for pulse width modulation (PWM) are described. A described system includes a circuit that contains an inductor and a transistor that controls current through the inductor based on a PWM signal to produce an output; and a controller to provide the PWM signal, which includes PWM cycles that include on-durations and off-durations. The controller can receive a first signal indicating an input voltage that is applied to the inductor, receive a second signal indicating a current through the inductor, use an on-duration parameter value to control the on-duration, determine a maximum off-duration of the off-durations corresponding to the PWM cycles occurring within a first voltage cycle, the first voltage cycle being defined between two consecutive zero-crossing events as indicated by the first signal, and adjust the on-duration parameter value for a second, subsequent voltage cycle based on the maximum off-duration to regulate the output voltage. | 12-29-2016 |