Class / Patent application number | Description | Number of patent applications / Date published |
323207000 | Using converter | 70 |
20080197818 | Switching converter having an activatable and deactivatable damping circuit - A switching converter for power factor correction which has-input terminals, an inductive storage element coupled to the input terminals, a rectifier arrangement, a control arrangement, and a damping circuit. The rectifier arrangement is connected to the inductive storage element and has output terminals for providing an output voltage. The control arrangement is configured to control a current drawn by the inductive storage element. The control arrangement is also configured to magnetize the inductive storage element during an actuation period for a magnetization time, demagnetize it for a demagnetization time, and wait a waiting time before a subsequent magnetization time. The damping circuit is coupled to the inductive storage element, and is configured to be activated and deactivated dependent at least in part on a magnetization state of the inductive storage element. | 08-21-2008 |
20080211462 | METHOD AND APPARATUS FOR ACTIVE POWER FACTOR CORRECTION - A power factor correction method and apparatus which use Pulse Frequency Modulation (PFM) to control an AC/DC converter is disclosed. The average current drawn by the AC/DC converter is compared with a reference sinusoidal signal and the error is used to determine the switching frequency. The switching frequency varies with the sinusoidal reference signal such that the converter emulates a resistive load. By using PFM control, EMI is spread over a range rather than concentrated at a few frequencies. Since the switching frequency decreases with the loading of the converter, the switching loss decreases with the loading as well. Thus, the need of meeting efficiency standards, e.g. the 80 PLUS and Energy Star, can be fulfill without extra circuitry. | 09-04-2008 |
20080211463 | METHOD AND APPARATUS FOR ACTIVE POWER FACTOR CORRECTION WITHOUT SENSING THE LINE VOLTAGE - A power factor correction apparatus which uses Pulse Frequency Modulation (PFM) to control an AC/DC converter is disclosed. Only a current signal from the converter is used to determine the switching frequency. Sensing of the input line voltage is not needed. The switching frequency varies with the line voltage such that the converter emulates a resistive load. By using PFM control, EMI is spread over a range rather than concentrated at a few frequencies. Thus a smaller EMI filter can be used. Since the switching frequency decreases with the loading of the converter, the switching loss decreases with the loading as well. Thus, the need of meeting efficiency standards, e.g. the 80 PLUS and Energy Star, can be fulfill without extra circuitry. | 09-04-2008 |
20080211464 | SYSTEMS OF PARALLEL OPERATING POWER ELECTRONIC CONVERTERS - A converter unit is disclosed which produces an output voltage based on reference signals (u* | 09-04-2008 |
20080246444 | SYSTEM AND METHOD FOR POWER CONTROLLER - System and method for power controller. According to an embodiment, the present invention provides a power factor correction apparatus. The apparatus includes a multiplier component that is configured to process a first input signal and a second input signal. For example, the first input signal is associated with a rectified alternating current signal, and the second input signal is associated with an error signal. The multiplier component further is configured to generate a first output signal based on the first input signal and the second input signal. The apparatus also includes a comparator component that is configured to process a third input signal and fourth input signal. The third input signal is associated with the first output signal. The comparator component is further configured to generate a second output signal based on the third input signal and the fourth input signal. | 10-09-2008 |
20080246445 | Power factor correction by measurement and removal of overtones - A power factor correction circuit ( | 10-09-2008 |
20080252268 | Method for actuation, and actuating circuit for a switch in a power factor correction circuit - The document describes a method and an actuating circuit for actuating a switch regulating the power consumption in a power factor correction circuit which has input terminals for applying an input voltage and output terminals for providing an output voltage. In this case, the switch is cyclically turned on for an on-time and turned off for an off-time, respectively, with the on-time having a first on-time period and a second on-time period which is directly adjacent to the first on-time period. A length for the first on-time period is in this case dependent on the control signal, and a length for the second on-time period is proportional, at least for a prescribed range of values for an instantaneous value of the input voltage, to a quotient with a first first-degree function for this instantaneous value in the denominator and a second first-degree function for the instantaneous value in the numerator, with function values for the first function increasing as the instantaneous value rises. | 10-16-2008 |
20080272748 | Power Factor Correction (PFC) Controller and Method Using a Finite State Machine to Adjust the Duty Cycle of a PWM Control Signal - A power factor correction (PFC) controller and method uses a finite state machine to adjust the duty cycle of a pulse width modulation (PWM) switching control signal. The PFC controller has a target current generator that receives the link output voltage and generates a target current proportionate to the rectified line input voltage. The PFC controller further includes a comparator which outputs a two-level current comparison result signal. The finite state machine responsive to the two-level current comparison result signal, generates a switch control signal that has a duty cycle which is adjusted for controlling the switch so that the sensed current is approximately proportionate to the rectified line input voltage, such that power factor correction is performed. | 11-06-2008 |
20090033296 | DEVICE, METHOD, AND SYSTEM FOR IMPROVING ELECTRICAL POWER FACTOR AND HARMONIC POWER QUALITY THROUGH ACTIVE CONTROL OF POWER QUALITY IMPROVING ELECTRICAL APPLIANCES - A system, method and device for controlling and modifying the current drawn by an electrical load in a way that will improve the electrical power factor and harmonic quality of at least a portion of an electrical power system. In one embodiment of the invention, the invention includes a controller device that monitors the electrical current entering a site and modifies or corrects power quality of the current by directing how power will be consumed by the appliances at a site to improve the harmonic and power factor qualities of the electrical current entering the site. | 02-05-2009 |
20090102436 | Controller for the three-phase cascade multilevel converter used as shunt active filter in unbalanced operation with guaranteed capacitors voltages balance - The present invention comprises a controller for the cascade H-bridge three-phase multilevel converter used as a shunt active filter. Based on the proposed mathematical model, the controller is designed to compensate harmonic distortion and reactive power due to a nonlinear distorting load. Simultaneously, the controller guarantees regulation and balance of all capacitor voltages. The idea behind the controller is to allow distortion of the current reference during the transients to guarantee regulation and balance of the capacitors voltages. The controller provides the duty ratios for each H-bridge of the cascade multilevel converter. | 04-23-2009 |
20090146619 | POWER FACTOR CORRECTION METHOD FOR AC/DC CONVERTERS AND CORRESPONDING CONVERTER - An indirect and passive method for AC/DC( converter power factor correction is disclosed. The correction is achieved by stabilizing the input impedance of the converter with keeping the inversely proportional dependence between the current i | 06-11-2009 |
20090200994 | METHOD AND APPARATUS FOR DISTRIBUTED VAR COMPENSATION - A method and apparatus for generating on-demand power. The method comprises receiving a peak reactive current request, generating a control signal based on the peak reactive current request, and utilizing the control signal to drive a DC/AC inverter to generate reactive power commensurate with the peak reactive current request. | 08-13-2009 |
20090230929 | BRIDGELESS PFC CIRCUIT FOR CRM AND CONTROLLING METHOD THEREOF - The configurations of a bridgeless PFC circuit system and a controlling method thereof are provided. The proposed system includes a bridgeless PFC circuit having a first and a second input terminals, a first switch having a first terminal, a first inductor having a first terminal coupled to the first input terminal and a second terminal coupled to the first terminal of the first switch, and a second inductor having a first terminal coupled to the second input terminal, a first auxiliary winding coupled to the first inductor and generating a first sensing signal, and a second auxiliary winding coupled to the second inductor and generating a second sensing signal, wherein the first and the second sensing signals are used to generate an inductor current sensing signal controlling the switching of the first switch accordingly. | 09-17-2009 |
20090251114 | ALTERNATING-CURRENT POWER SUPPLY DEVICE RECOVERING MAGNETIC ENERGY - The present invention relates to an alternating-current power supply device which can improve a power factor of an alternating-current load, realizes low cost and miniaturization, and recovers magnetic energy. The alternating-current power supply device includes a bridge circuit composed of four reverse conducting semiconductor switches, a capacitor that is connected between direct-current terminals of the bridge circuit and absorbs the magnetic energy at the time of cutting off the current, an alternating-current voltage source that is connected to the induction load in series and is inserted between alternating-current terminals of the bridge circuit, and a control circuit that gives a control signal to gates of the respective reverse conducting semiconductor switches and controls on/off states of the respective reverse conducting semiconductor switches. The control circuit simultaneously controls the on/off operation of the paired reverse conducting semiconductor switches positioned on a diagonal line of the four reverse conducting semiconductor switches composing the bridge circuit, makes a control so that when one pair of the two pairs is ON, the other pair is OFF, and switches the control signal in synchronization with a voltage of the alternating-current voltage source. | 10-08-2009 |
20090278511 | METHOD FOR REDUCING THE REACTIVE POWER REQUIREMENT OF A FUNDAMENTAL FREQUENCY CLOCKED POWER SUPPLY SIDE CONVERTER UNDER NO LOAD AND WITH LOW MOTOR LOADING - The invention relates to a method for reducing the idle current requirement of a base frequency clocked supply side converter ( | 11-12-2009 |
20100013444 | POWER CONVERTER - This invention relates to a power converter ( | 01-21-2010 |
20100127671 | INTERLEAVED POWER FACTOR CORRECTOR BOOST CONVERTER - The present invention relates to an interleaved power factor (PFC) correction boost converter. In order to enable the interleaved PFC boost converter circuit to operate over a wide range of input voltages and frequencies the circuit comprises: A first converter (A); A second converter (B) configured to operate in conjunction with the first converter; and A timing circuit (X) connected to both the first converter (A) and the second converter (B), wherein timing information is shared between the first converter and the second converter. | 05-27-2010 |
20100134076 | REACTIVE POWER REGULATION AND VOLTAGE SUPPORT FOR RENEWABLE ENERGY PLANTS - Systems and methods are provided for reactive power regulation and voltage support for renewable energy plants. In one embodiment, a system and method are provided for coordinating voltage and reactive power output of a plant with one or more requirements associated with a utility. The method can include generating a VAR regulator output signal based at least in part on a reactive power control signal received from a utility, controlling reactive power and voltage output of the one or more power sources based at least in part on the generated VAR regulator output signal, aggregating reactive power output or the one or more power sources, and providing the aggregated reactive power to the utility. | 06-03-2010 |
20100171472 | Statcom System For Providing Reactive And/Or Active Power To A Power Network - A static compensator system for providing reactive and/or active power to a power network. The system includes a static compensator, which has a DC capacitor U | 07-08-2010 |
20110037443 | PARALLEL CONNECTED PFC CONVERTER - A parallel PFC converter comprises a first PFC circuit, a second PFC circuit, and a voltage divider. The second PFC circuit is connected in parallel with the first PFC circuit for generating an output voltage of the parallel PFC converter. The voltage divider is coupled to receive the output voltage for generating a first feedback signal and a second feedback signal. The first feedback signal is higher than the second feedback signal. The first PFC circuit and the second PFC circuit respectively comprises a first switching control circuit and a second switching control circuit for regulating the output voltage. It is an object of the present invention to reduce the power loss for improving the efficiency of the PFC converter. | 02-17-2011 |
20110095732 | POWER FACTOR CORRECTION CIRCUIT AND DRIVING METHOD THEREOF - The present invention relates to a power factor correction circuit and a driving method thereof. | 04-28-2011 |
20110095733 | POWER FACTOR CORRECTION CIRCUIT AND DRIVING METHOD THEREOF - The present invention relates to a power factor correction circuit and a driving method thereof. | 04-28-2011 |
20110095734 | CASCADED PFC AND RESONANT MODE POWER CONVERTERS - A power supply includes a PFC (power factor correction) converter that has an input and an output. The PFC converter input is coupled to an input of the power supply. The power supply also includes a resonant mode converter that has an input and an output. The resonant mode converter input is coupled to the PFC converter output and the resonant mode output is coupled to an output of the power supply. A control unit is also included in the power supply and is coupled to receive a feedback signal that is representative of the output of the power supply. The control unit is coupled to provide control signals coupled to control switches of the resonant mode converter at a controlled switching frequency to control the output of the power supply. The control unit is further coupled to provide a PFC control signal coupled to control a switch of the PFC converter at a switching frequency that is harmonically related to the controlled switching frequency. | 04-28-2011 |
20110210706 | CONVERTER DEVICE AND METHOD FOR CONVERTING ELECTRICAL POWER - A converter device for power conversion in e.g. a power plant such as a wind turbine is disclose. The converter device is configured for converting an electrical input power to an electrical output power. The converter device may be configured for receiving mechanical input power or, according to another embodiment, may be configured for receiving electrical input power. The converter device includes a voltage input for receiving a voltage signal, which is indicative of a voltage in a electricity network to which the converter device is coupled during operation in order to provide the electrical output power to the electricity network The converter device includes a controller being configured for setting a reactive component of the electrical output power depending on the voltage signal according to a out-of-band reactive current gradient if the voltage indicated by the voltage signal is outside a predetermined voltage band. | 09-01-2011 |
20110254517 | SELF-EXCITED REACTIVE POWER COMPENSATION APPARATUS - A control device of a self-excited reactive power compensation apparatus controls a reactive current output from a self-excited converter to a power system. The control device includes a first reference generating unit, a second reference generating unit, and a selecting unit. The first reference generating unit generates a first voltage reference of an output voltage output from the self-excited converter, such that the reactive current detected by a reactive current detecting unit follows a current reference. The second reference generating unit generates a second voltage reference of the output voltage output from the self-excited converter, such that a value of the reactive current becomes a predetermined value. The selecting unit selects a maximum value from the first and second voltage references. | 10-20-2011 |
20110260700 | POWER FACTOR CORRECTION CONVERTER AND CONTROL METHOD THEREOF - A power factor correction converter and a control method thereof are provided includes an interleaving control tube set, an interface to an alternating current power supply, a first inductor, a second inductor, a third inductor, a capacitor, a first bridge arm and a second bridge arm. Abridge arm includes a first switch tube and a second switch tube connected in series; The first bridge arm, the second bridge arm, and the capacitor are connected to each other in parallel; the alternating current power supply and the first inductor are connected in series, and the second inductor and the third inductor are connected in parallel, and then connected to the first inductor in series; the second inductor is connected to the first bridge arm, and the second inductor is connected to the second bridge arm; and the alternating current power supply and the first inductor are connected in series. | 10-27-2011 |
20110260701 | Multilevel Converter as Reactive Power Compensator Having Active Power Symmetrization - A multilevel converter has a plurality of converter strands, which are connected to the phases of a three-phase-network in a star or delta connection. From phase voltage values and phase current values, an active component characteristic of the overall active current and two asymmetrical components characteristic of a distribution of the overall flowing active and reactive currents are determined. The active and the two asymmetrical components are each filtered and multiplied with the phase voltage values and the two filtered asymmetrical components. The multiplied values are then weighed and added to the phase current values. From the asymmetrical components and the phase voltage values, a zero current is determined and added to the phase current values such that it symmetrizes a potential asymmetrical active current flow that would occur without the zero current. From the modified phase current values, a control state for the converter strands is determined. | 10-27-2011 |
20120001600 | CONTROL CIRCUIT OF INTERLEAVED PFC POWER CONVERTER - A control circuit of an interleaved PFC power converter according to the present invention comprises a master switching control circuit, a slave switching control circuit, and a slave reference signal generator. The master switching control circuit generates a control signal and a first switching signal in response to an input voltage and a feedback signal. The first switching signal is utilized to control a first switch of the PFC power converter. The slave reference signal generator generates a slave control signal in response to a load condition of the PFC power converter and the control signal. The slave switching control circuit generates a second switching signal in response to the slave control signal. The slave control signal is utilized to control a second switch of the PFC power converter. The slave reference signal generator adjusts the control signal in response to the load condition for generating the slave control signal correspondingly. The slave control signal drives the slave switching control circuit to adjust the switching frequency of the second switch for reducing the switching loss. | 01-05-2012 |
20120056604 | Power supply circuit - A power supply circuit to detect whether or not abnormal current is generated in a power factor compensation circuit and forcibly stop an operation of an interleaved power factor compensation circuit controller if abnormal current is generated. The power supply circuit includes a rectifier, a power factor compensation circuit including a plurality of reactors, a plurality of switches and a plurality of current detectors, a power factor compensation circuit controller to control switching of the switches and to control a power factor compensation operation, and a power factor compensation circuit protection circuit to receive the voltages output from the plurality of current detectors and to stop the operation of the power factor compensation circuit controller if at least one of the voltages output from the plurality of current detectors is abnormal. Thus, it is possible to prevent failure of the switches and the current detectors due to abnormal current. | 03-08-2012 |
20120086412 | Arrangement For Exchanging Power - Power exchanging arrangement, in shunt connection, with a three-phase electric power network including on one hand for each said phase a reactive impedance element and a Voltage Source Converter connected in series with said element, and on the other hand a control unit configured to control semiconductor devices of turn-off type of said converter for generating a voltage with a fundamental frequency being equal to the fundamental frequency of the voltage of the respective said phase and by that control a flow of reactive power between said arrangement and the respective phase of said electric power network. Each Voltage Source Converter includes a series connection of switching cells in the form of so-called H-bridges including two switching elements connected in parallel and each having at least two semiconductor assemblies connected in series. Each switching cell further comprises at least one energy storing capacitor connected in parallel with said switching elements. | 04-12-2012 |
20120105023 | AUTOMATIC AC BUS VOLTAGE REGULATION FOR POWER DISTRIBUTION GRIDS - A system for automatically regulating voltage on a distribution-level AC bus having an actual voltage and a nominal voltage includes an electronic power converter connected to the distribution-level AC bus. The system generates a feedback signal representative of the actual voltage of the distribution-level AC bus and produces an input control signal in response to the feedback signal. The input control signal is representative of a commanded level of reactive power. The electronic power converter is responsive to the input control signal to deliver a commanded reactive power output to the distribution-level AC bus, and the commanded reactive power output pushes the actual voltage towards the nominal voltage. | 05-03-2012 |
20120112712 | POWER FACTORY CORRECTION CIRCUIT AND POWER SUPPLY HAVING THE SAME - A power supply includes an EMI filter removing noises from an input signal, a rectifying circuit rectifying and outputting the input signal, and a power factor correction circuit varying a magnitude in output voltage according to a duty ratio of a driving signal while generating an output voltage by an energy storage unit storing and discharging energy, controlling the duty ratio of the driving signal according to the change in the output voltage, and controlling the magnitude in output voltage before the output voltage is determined to be in an overvoltage state by using a second threshold voltage to be set lower than the first threshold voltage while determining whether the output voltage is in an overvoltage state by using the first threshold voltage. The power supply controls the magnitude in output voltage before it is determined that the output voltage is in an overvoltage state by being overshot. | 05-10-2012 |
20120112713 | METHOD AND APPARATUS FOR AUTOMATIC NETWORK STABILIZATION IN ELECTRIC POWER SUPPLY SYSTEMS USING AT LEAST ONE CONVERTER - Method and apparatus for automatic stabilization of an electric power supply network system comprising a network and at least one converter adapted to exchange maximum transferrable power with the network by changing the real current through a stabilizing controller, whereby the necessary direction of current change is determined through real-time stability analysis. | 05-10-2012 |
20120139505 | Bridgeless PFC Converter and the Method Thereof - A bridgeless PFC (power factor correction) converter with improved efficiency is disclosed. The bridgeless PFC converter comprises: a first input terminal and a second input terminal configured to receive an input AC signal; an output terminal; an inductor set comprising N inductors, wherein a first terminal of each inductor is coupled to the first input terminal; and an output stage comprising (N+1) switching circuits coupled between the output terminal and a ground node. | 06-07-2012 |
20120169300 | INTEGRATED ELECTRIC METER WITH VAR CAPABILITY - An integrated electric meter with VAR capability is disclosed. In one aspect, an electric meter determines a plurality of power related parameters for an AC network, and a VAR generation unit integrated with the electric meter uses the plurality of power related parameters to inject a desired amount of reactive power in the AC network and correct power factor. | 07-05-2012 |
20120206113 | PARAMETER CONFIGURATION METHOD FOR ELEMENTS OF A POWER FACTOR CORRECTION CONVERTER - Systems and methods for configuring parameters of elements of a power factor correction (PFC) converter are disclosed herein. The PFC converter may include a PFC circuit configured to modulate input power into DC modulated power, and a transformer configured to transform the DC modulated power into an output power. A storage capacitor configuration procedure, a storage inductor configuration procedure, and a phase angle and voltage verification procedure may be utilized with the PFC converter. A phase comparator and storage capacitor configuration may be used to determine a test voltage and phase angle, where a rated bus phase angle that is lower than the test voltage and test phase angle may determine a parameter of the storage capacitor network to supply the rated bus voltage and subsequent phase angle correction. | 08-16-2012 |
20120206114 | Method and device for operating a solar cell assembly - A method is described for operating a solar cell assembly, particularly having solar cells that are organically based for power output from it, wherein an electric power output is controlled according to a specified time program, or at least one state variable of the solar cell assembly is monitored in a time-dependent manner, and the output electric power is controlled as a function of recorded measured values of the state variable. | 08-16-2012 |
20120249091 | POWER FACTOR CORRECTION BOOST CONVERTER AND FREQUENCY SWITCHING MODULATION METHOD THEREOF - The instant disclosure provides a Power Factor Correction (PFC) boost converter including a PFC converter unit and a control unit and a frequency switching modulation method thereof. The control unit outputs a pulse width modulation (PWM) signal to the PFC converter unit for adjusting an electronic power output to a voltage converter. As the output load of the PFC converter unit increases, the control unit increases the frequency of the PWM signal. Conversely, as the output load of the PFC converter unit decreases, the control unit reduces the frequency of the PWM signal. Consequently, the switching loss of the PFC converter unit is reduced. | 10-04-2012 |
20120262132 | OVERVOLTAGE REPETITION PREVENTION CIRCUIT, METHOD THEREOF, AND POWER FACTOR COMPENSATION CIRCUIT USING THE SAME - The present invention relates to an overvoltage repetition prevention circuit, a method thereof, and a power factor correction circuit including the same. | 10-18-2012 |
20120293141 | BRIDGELESS PFC CONVERTER AND THE METHOD THEREOF - A bridgeless PFC (power factor correction) converter with improved efficiency is disclosed. The bridgeless PFC converter comprises: input terminals configured to receive an input AC power supply; an output terminal configured to provide power supply; a high frequency bridge arm comprising a first switch and a third switch coupled between the output terminal and a ground node; a low frequency bridge arm comprising a second switch and a fourth switch coupled between the output terminal and the ground node; an inductor coupled between the input AC power supply and the high frequency bridge arm; and a control circuit configured to control the switching of switches in the high frequency bridge arm and the low frequency bridge arm. | 11-22-2012 |
20130043847 | POWER FACTOR CORRECTION CIRCUITRY AND METHODOLOGY TO COMPENSATE FOR LEADING POWER FACTOR - Aspects relate to utilizing power factor correction to compensate for a leading power factor produced mainly due to electromagnetic interference (EMI) capacitors in front of a power factor correction stage. Provided is a power supply that includes a power factor correction circuit that includes a second harmonic generator component. The harmonic generator component includes a filter component and an integrator component. The filter component is configured to receive a rectified voltage and a power factor correction current and block a direct current component. The integrator component is configured to receive an alternating current component from the filter component and produce a harmonic that causes an angle of the power factor correction current to change from a leading power factor to a unity power factor or to a lagging power factor. | 02-21-2013 |
20130082666 | BUCK POWER FACTOR CORRECTION SYSTEM - The invention disclosed buck power factor correction system. The system includes: a first storing device, for storing and discharging energy; a first converter device, coupled to the first storing device, for transferring and converting energy; a second storing device, coupled to the first storing device, for storing and discharging energy; and a second converter device, coupled to the second storing device, for transferring and converting energy. | 04-04-2013 |
20130169242 | ACTIVE BUCK POWER FACTOR CORRECTION DEVICE - The present disclose relates to a power active buck power factor correction device, comprising: a AC source; a rectifying device coupled to the AC source for receiving and rectifying the AC source so as to generate an input voltage; a first converting device coupled to the assistance device for receiving, transmitting, converting and storing energy; a load coupled to the first converting device; and an assistance device coupled to the first converting device for generating an assistance voltage. Specifically, the polarity of the assistance voltage is same with the input voltage, but is contrary to an output voltage, so that the first converting device may continue to work and receive an input current under the input voltage is smaller than the output voltage while the discontinue time of the input current is getting shorter so as to obtain the perfected power factor correction effect. | 07-04-2013 |
20130207622 | SYSTEM AND METHOD FOR REACTIVE POWER REGULATION - A system and method are provided for performing reactive power control. The system includes a power converter and a controller coupled to the power converter. The power converter is configured to convert a first form of electric power generated from the power source to a second form of electric power suitable to be distributed by the electrical grid. The controller is configured to monitor the electric power transmitted between the power converter and the electrical grid. The controller is further configured to decouple a positive sequence component and a negative sequence component from the monitored electric power. The controller is further configured to perform a positive reactive power control and a negative reactive power control with respect to the decoupled positive and negative sequence components. The controller is further configured to transmit a control signal to the power converter based on the positive and negative reactive power control. | 08-15-2013 |
20130207623 | Power Supply Device for a Nonlinear, Time-Varying Load - A power supply device for a nonlinear, time-varying load has a multi-phase power system. The load and a reactive power compensator are connected to the phases of the power system. The reactive power compensator is embodied as a multilevel converter with multiple strands, each connected to one of the power system phases and to the other strands at a common star point. The power supply device has a filter circuit that filters harmonics of load and converter currents. The filter circuit has multiple strands, each connected to one of the power system phases and to the other strands at a common star point of the filter circuit, which is connected to the common star point of the multilevel converter such that the common star point of the multilevel converter is connected to the power system phases both via the strands of the multilevel converter and via the filter circuit. | 08-15-2013 |
20130214746 | POWER MODULE AND AIR CONDITIONER - A power module is a power module having a PFC (power factor correction) function. The power module includes: IGBTs in a pair; first diodes in a pair connected to the IGBTs in a pair, the first diodes forming a reverse-conducting element; and second diodes in a pair connected to the IGBTs in a pair, the second diodes having a rectifying function. The power module further includes a driving IC that drives the IGBTs in a pair, and P terminals in a pair provided independently of each other. The P terminals are connected to one ends of the first diodes in a pair, respectively, the one ends being opposite to the other ends of the first diodes to which the IGBTs in a pair are connected. | 08-22-2013 |
20130249504 | POWER FACTOR CORRECTION (PFC) CONTROLLER AND BRIDGELESS PFC CIRCUIT WITH THE SAME - A power factor correction (PFC) controller for controlling at least a switching unit is provided. The PFC controller has a feedback control circuit, a conductive current detecting circuit, and a switching control circuit. The feedback control circuit generates a feedback control signal for turning off the switch according to a feedback voltage signal. The conductive current detecting circuit has a clamp circuit, which generates a clamped signal restricted in a positive potential varying range according to a negative potential portion of a conductive-current detecting signal, and generates a cutoff signal for turning off the switch according to at least the clamped signal. The switching control circuit is utilized for controlling the switch according to the feedback control signal and the cutoff signal. | 09-26-2013 |
20130257391 | Power-Factor Correction Using Voltage-To-Current Matching - An example apparatus includes a power-factor correction (PFC) circuit coupleable to a primary load that exhibits a change in resistance with a change in applied voltage, with the respective voltage being a primary-load voltage, and current through the primary load being a primary-load current. The PFC circuit is configured to provide an auxiliary load and control current therethrough, with the respective current being an auxiliary-load current. In this regard, the PFC circuit is configured to control the auxiliary-load current such that the sum of the primary-load current and auxiliary-load current is a substantially-constant proportion of the primary-load voltage, the respective sum being a sum current. | 10-03-2013 |
20130265014 | Reactive Power Compensator, Computer Programs And Computer Program Products - A reactive power compensator. The reactive power compensator includes a power transformer having an AC bus side and a compensator bus side, wherein the power transformer is connectable to an AC grid at the AC bus side. The reactive power compensator further includes a thyristor-switched capacitor and a thyristor-controlled reactor connected to the compensator bus side. The reactive power compensator includes a booster transformer connected in series with the power transformer and to the compensator bus side. The invention also relates to computer programs and computer program products. | 10-10-2013 |
20140002034 | POWER QUALITY DEVICE AND ITS CONTROL APPARATUS | 01-02-2014 |
20140049230 | NOVEL MULTI-LEVEL CONVERTER TOPOLOGY WITH THE POSSIBILITY OF DYNAMICALLY CONNECTING INDIVIDUAL MODULES IN SERIES AND IN PARALLEL - The present invention describes an electrical converter system for power supply systems, comprising at least two identical individual modules connected consecutively, characterised in that each individual module have at least four internal switching elements, at least one energy storage element and at least four connectors, wherein the connectors are paired and serve as a first and a second terminal pair; the internal switching elements of each individual module are designed in such manner that they are able to selectively connect one or both connectors of each terminal pair to the energy storage element; the cascaded connection of at least two individual modules is made in such manner that the connectors in the second terminal pair of a preceding individual module are each connected to the connectors of the first terminal pair in the respective following individual module, and at least one terminal of the first terminal pair of the first individual module of the cascaded connection and at least one terminal of the second terminal pair of the last individual module of the cascaded connection serve as terminals for the cascaded connection; and wherein the switching elements of the respective individual modules in the cascaded connection of at least two individual modules connect their respective energy storage element to the terminals of the cascaded connection in such manner that a selective serial or parallel connection of the energy storage elements is made. | 02-20-2014 |
20140049231 | PFC SIGNAL GENERATION CIRCUIT, PFC CONTROL SYSTEM USING THE SAME, AND PFC CONTROL METHOD - A PFC signal generation circuit which generates a PFC signal to control a PFC circuit including a first inductor connected to a first switch and a second inductor connected to a second switch includes: a counter whose count value is cleared based on a first timing when a zero current of the first inductor is detected; a counter clear control circuit that clears the counter value after waiting until a cycle lower limit is reached, when the first timing is below the cycle lower limit; a first control signal output unit that outputs a first PFC signal to turn on the first switch at a timing when the count value is cleared; and a second control signal output unit that outputs a second PFC signal to turn on the second switch based on a second timing when a zero current of the second inductor is detected. | 02-20-2014 |
20140103886 | Method for producing reactive current with a converter and converter arrangement and energy supply plant - in a method for producing reactive current with a converter ( | 04-17-2014 |
20140103887 | POWER CONVERTER AND METHOD FOR CONTROLLING SAME - A power converter | 04-17-2014 |
20140132228 | PWM CONTROLLER DETECTING TEMPERATURE AND AC LINE VIA A SINGLE PIN AND POWER CONVERTER USING SAME - A PWM controller detecting temperature and AC line via a single pin and a power converter using the PWM controller, the PWM controller comprising: an output pin for providing a PWM signal; and a dual-function pin for receiving a temperature signal when the PWM signal is at a high level, and for receiving an AC line signal when the PWM signal is at a low level. | 05-15-2014 |
20140132229 | STATIC SYNCHRONOUS COMPENSATOR SYSTEMS AND RELATED METHODS - Static synchronous compensator (STATCOM) systems and methods are disclosed. An example STATCOM system includes a reactive component configured for electrical connection to a power network. For example, the reactive component may be a capacitor bank. The system also includes an inductor electrically connected in series with the reactive component. Further, the system includes a converter electrically connected in series with the reactive component and the inductor. A method may include using the static synchronous compensator system to provide one of reactive power and active power to the power network. | 05-15-2014 |
20140152271 | POWER FACTOR CORRECTION APPARATUS AND METHOD FOR CORRECTING POWER FACTOR USING THE SAME - There are provided a power factor correction device and a method for controlling power factor correction using the same. The power factor correction device includes a power factor correction circuit and a control circuit. The power factor correction circuit includes first and second inductors connected to an input power source stage and first and second main switches performing a switching operation on the first and second inductors, respectively. The control circuit may provide control signals to the first and second main switches, respectively, and when phase currents flowing in the respective first and second inductors are unbalanced, the control circuit may change a phase of at least one of the first and second main switches to correct an imbalance of the phases. | 06-05-2014 |
20140176088 | DISTRIBUTION TRANSFORMER POWER FLOW CONTROLLER - A distribution transformer power flow controller apparatus includes at least one external source terminal configured to be coupled to a distribution transformer, at least one external load terminal configured to be coupled to a load, and a converter circuit configured to be coupled between the at least one external source terminal and the at least one external load terminal to provide series connection of the converter circuit with the load and to control a power transfer of the distribution transformer. The converter circuit may be configured to control a reactive power transfer of the distribution transformer. The converter circuit may also be configured to control a reactive power transfer and a real power transfer. In some embodiments, the converter circuit may be configured to be coupled to at least one energy storage capacitor, at least one battery and/or at least one power generation device. | 06-26-2014 |
20140176089 | PHASE SHIFT CIRCUIT AND POWER FACTOR CORRECTION CIRCUIT INCLUDING THE SAME - There are provided a phase shift circuit and a power factor correction circuit including the same. The phase shift circuit includes a ramp generation unit charging or discharging a capacitor connected to a switch device to generate a ramp signal, a reference signal generation unit generating a predetermined reference signal from the ramp signal, and a comparison unit comparing the ramp signal with the reference signal to generate a clock signal, wherein at least one of the reference signal generation unit and the comparison unit changes a negative or positive value of offset components included in the reference signal or the ramp signal within every operating period of the switch device. | 06-26-2014 |
20140354246 | BRIDGELESS PFC POWER CONVERTER WITH HIGH EFFICIENCY - A bridgeless PFC boost converter has two auxiliary transistor switches coupled to an input AC voltage source and two boost inductors coupled to opposing ends of the input AC voltage source. A first boost inductor is coupled to a junction node of a first rectifying diode and a first transistor switch coupled in series. A second boost inductors is coupled to a junction node of a second rectifying diode and a second transistor switch coupled in series. The rectifying diodes are commonly coupled to an output capacitor, and the transistor switches are commonly coupled to a second node of the output capacitor. A first auxiliary transistor switch is commonly coupled with the first boost inductor and to a first node of the input AC voltage source. A second auxiliary transistor switch is commonly coupled with the second boost inductor and to a second node of the input AC voltage source. | 12-04-2014 |
20140354247 | BRIDGELESS PFC POWER CONVERTER WITH REDUCED EMI NOISE - A bridgeless PFC boost converter has either a single switching cell or two identical switching cells configured to operate 180 degrees out of phase. A switching cell includes first and second transistor switches coupled to opposing ends of an input AC voltage source, and first and second rectifying diodes, one rectifying diode coupled in series to each of the two transistor switches. A boost inductor is coupled to a junction node between each transistor switch and rectifying diode series. Either a third rectifying diode or a third transistor switch is coupled to a junction node between the input AC voltage source and the first transistor switch. Either a fourth rectifying diode or a fourth transistor switch is coupled to a junction node between the input AC voltage source and the second transistor switch. The rectifying diodes are coupled an output capacitor. Two switching cells can be interleaved. | 12-04-2014 |
20150015216 | THREE-PHASE POWER CONVERSION WITH POWER FACTOR CORRECTION OPERATIONAL DAY AND NIGHT - System and method for controlling power factor correction (PFC) for three-phase AC power conveyed via a three-phase AC power grid. Currents and voltages on the grid are monitored and used to generate waveform data enabling dynamic control of switching circuitry used in controlling one or more phase offsets between the currents and voltages. | 01-15-2015 |
20150069980 | CONVERTER IN DELTA CONFIGURATION - A converter for three-phase voltage has three electrically delta-connected series circuits. Each of the series circuits has at least two switching modules connected in series. A control device is connected to the switching modules and can drive the switching modules in such a way that branch currents with a fundamental frequency of the three-phase voltage and with at least one additional current harmonic flow in the series circuits. The additional current harmonic is dimensioned such that it flows in the series circuits of the converter and remains inside the converter. | 03-12-2015 |
20150077069 | NOVEL MULTI-LEVEL CONVERTER TOPOLOGY WITH THE POSSIBILITY OF DYNAMICALLY CONNECTING INDIVIDUAL MODULES IN SERIES AND IN PARALLEL - The present invention describes an electrical converter system for power supply systems, comprising at least two identical individual modules connected consecutively, characterised in that each individual module have at least four internal switching elements, at least one energy storage element and at least four connectors, wherein the connectors are paired and serve as a first and a second terminal pair; the internal switching elements of each individual module are designed in such manner that they are able to selectively connect one or both connectors of each terminal pair to the energy storage element; the cascaded connection of at least two individual modules is made in such manner that the connectors in the second terminal pair of a preceding individual module are each connected to the connectors of the first terminal pair in the respective following individual module, and at least one terminal of the first terminal pair of the first individual module of the cascaded connection and at least one terminal of the second terminal pair of the last individual module of the cascaded connection serve as terminals for the cascaded connection; and wherein the switching elements of the respective individual modules in the cascaded connection of at least two individual modules connect their respective energy storage element to the terminals of the cascaded connection in such manner that a selective serial or parallel connection of the energy storage elements is made. | 03-19-2015 |
20150115905 | Power Compensator - A power compensator for compensating voltage at a location along a power transmission line, the compensator having a controller for controlling a voltage generated across the compensator, wherein the voltage is controlled to maintain a power transmission line voltage at a value dependent on the power transmission line location. | 04-30-2015 |
20160072377 | POWER SUPPLY AND APPARATUS INCLUDING THE SAME - A power supply may include a control signal generating unit outputting a control signal in response to a load information signal input thereto, a controlling unit activating and outputting a first gate signal or activating and outputting first and second gate signals in response to the control signal, a first power factor correction unit operating in response to the first gate signal, and a second power factor correction unit operating in response to the second gate signal. | 03-10-2016 |
20160087522 | DISTRIBUTED POWER GRID CONTROL WITH LOCAL VAR CONTROL - A distributed control node enables local control of reactive power. A metering device of the control node measures energy delivered by a grid network at a point of common coupling (PCC) to which a load is coupled. The metering device determines that the load draws reactive power from the grid network. The control node draws real power from the grid and converts the real power from the grid into reactive power. The conversion of real to reactive power occurs on the consumer side of the PCC. The conversion of real to reactive power enables delivery of reactive power to a local load from real power drawn from the grid. | 03-24-2016 |
20160141952 | Digital Power Factor Correction - A circuitry for providing a power factor correction is suggested. The circuitry includes a digital pulse width modulator, a switching element, a control unit, and a combiner. An output of the digital pulse width modulator is connected to the switching element. The combiner determines a combined signal based on an output of the control unit and an input signal. The combined signal is conveyed towards the digital pulse width modulator. An output of the switching element provides a feedback signal for the digital pulse width modulator and for the control unit such that an error in the feedback signal is reduced. | 05-19-2016 |
20160149481 | METHODS AND DEVICES FOR POWER COMPENSATION - A method is performed in a control device for controlling a power compensation arrangement including a voltage source converter and one or more power compensation branches, each power compensation branch including a thyristor controlled reactor, a thyristor switched reactor or a thyristor controlled capacitor. The voltage source converter and the one or more power compensation branches are connected to a same busbar. The method includes: detecting a request in an electrical power system to which the power compensation arrangement is connected; determining, based on the request, a need for reactive power supply to the electrical power system; providing reactive power by means of the voltage source converter and/or by one or more of the power compensation branches; and compensating, by means of the voltage source converter, any disturbances caused by the power compensation branches when providing the reactive power to the electrical power system. Corresponding devices are also disclosed. | 05-26-2016 |
20160164399 | MULTILEVEL CONVERTER FOR POWER FACTOR CORRECTION AND ASSOCIATED OPERATING METHOD - A method operates a multilevel converter for power factor correction of a polyphase mains voltage. Each phase of the polyphase main has an associated phase module with a plurality of sub modules which are connected in series and each have an electrical energy store. Each sub module can be connected to the phase of the mains voltage or disconnected there from by an electronic switch. A circuit breaker is provided for disconnecting the converter from the mains voltage. The converter has a regulation system by which the voltages of the phase modules are balanced when the circuit breaker is open. | 06-09-2016 |