Entries |
Document | Title | Date |
20080273358 | Power Supply Device - A power supply device includes a first switching element, a second switching element, a transformer having a primary coil, a low-pass filter including an input port connected to the secondary coil, an output terminal connected to an output port of the low-pass filter, a detector for outputting a voltage that follows a voltage at the output terminal, a reference signal generator for generating a reference voltage, a comparator unit for outputting a signal based on a result of comparison between the voltage supplied from the detector and the reference voltage, and an operation pause circuit controlling the first and second switching elements. The operation pause circuit is operable to drive the first and second switching elements according to the signal output from the comparator unit, and to cause the first and second switching elements not to conduct regardless of the signal output from the comparator unit. | 11-06-2008 |
20090027933 | VOLTAGE LINK CONTROL OF A DC-AC BOOST CONVERTER SYSTEM - Systems and methods are disclosed for a DC boost converter. The systems and methods combine operation of an inductor with the input capacitor of a DC/AC inverter via a switch configuration to power the DC/AC inverter. The switch configuration is controlled by a plurality of control signals generated by a controller based on a variety of control modes, and feedback signals. | 01-29-2009 |
20090067203 | THREE PHASE INVERTER WITH IMPROVED LOSS DISTRIBUTION - An inverter circuit couples a DC voltage source having a primary side and a reference side to an electric motor or other AC machine having multiple electrical phases. An inverter circuit includes switches, diodes and a controller. For each of the electrical phases, a first switch couples the electrical phase to the primary side of the DC voltage source and a second switch couples the electrical phase with the reference side of the DC voltage source. For each of the first and second switches, an associated anti-parallel diode is configured to provide an electrical path when the switch associated with the diode is inactive. The controller is coupled to the switching inputs of each of the first and second switches and is configured to provide a control signal thereto, wherein the control signal provided to each switch comprises, in a low frequency mode, a first portion and a second portion, wherein the first portion comprises a first pulse width modulation scheme and the second portion comprises a second pulse width modulation scheme different from the first modulation scheme. | 03-12-2009 |
20090067204 | SYSTEM AND METHOD FOR PROVIDING CONTROL FOR SWITCH-MODE POWER SUPPLY - System and method for providing control for switch-mode power supply. According to an embodiment, the present invention provides a system for regulating a power converter. The system comprises a signal processing component that is configured to receive a first voltage and a second voltage, to process information associated with the first voltage and the second voltage, to determine a signal based on at least information associated with the first voltage and the second voltage, and to send the signal to a switch for a power converter. The switch is regulated based on at least information associated with the signal. The signal processing component is further configured to determine the signal to be associated a first mode, if the first voltage is higher than a first threshold. | 03-12-2009 |
20090073734 | Programmable feedback voltage pulse sampling for switched power supplies - Disclosed is a method and apparatus that includes a power supply having a primary coil and a secondary coil. The secondary coil generates an output voltage and a feedback voltage related to the output voltage. The feedback voltage is sampled at a time instant that is digitally controllable. The output voltage is determined from the feedback voltage. | 03-19-2009 |
20090237968 | POWER INVERTER AND METHOD - An apparatus and method for converting an input signal to an output AC signal in which the input voltage signal is inverted and modulated to provide an intermediate AC signal having twice the desired output frequency. The intermediate signal is then full-wave rectified and then the polarity of the rectified signal is switched every second cycle to produce the output AC signal of a desired frequency and voltage. | 09-24-2009 |
20090237969 | Controller IC, DC-AC conversion apparatus, and parallel running system of DC-AC conversion apparatuses - A DC power source voltage is supplied to a center tap of a primary winding, and first and second semiconductor switches alternately turned on are disposed between each of both ends of the primary winding and a common potential point, and a current flowing through a load is fed back and PWM control of each of the semiconductor switches is performed. Also, snubber circuits are respectively connected between a ground and the center tap of the primary winding, and an abnormal high voltage at the time of switching is reduced. Also, a parallel running of plural inverters is simply performed by disposing PWM comparators corresponding to the first and second semiconductor switches. | 09-24-2009 |
20090323379 | High efficiency photovoltaic inverter - A photovoltaic (PV) inverter includes a single DC to AC converter configured to operate solely in a buck mode for PV array voltage levels greater than a connected power grid instantaneous voltage plus converter margin, and further configured to operate solely in a boost mode for PV array voltage levels plus margin less than the connected power grid instantaneous voltage, such that the PV inverter generates a rectified sine wave current in response to the available PV array power, and further such that the PV inverter generates a utility grid current in response to the rectified sine wave current. | 12-31-2009 |
20100033998 | CONTROL OF A RESONANT CONVERTER - The invention deals with the control of a resonant LLC converter by setting up criteria for state parameters of the resonant converter, so that the converter may be operated in a near capacitive mode. The current flowing in the resonant tank and optionally the voltage at the a predetermined point in the resonant tank are monitored, and wherein a switch (a high side switch or a low side switch) is turned off when a first criterion is fulfilled together with a second criterion or optionally a third criterion, the first criterion ensuring a minimum time has lapsed after the switch is turned on, the second criterion being that the absolute value of the current is reaching a predetermined current level, the third criterion being that the voltage at the predetermined point reaches a predetermined voltage level. | 02-11-2010 |
20100142237 | SYSTEM AND METHOD FOR CONTROL OF A GRID CONNECTED POWER GENERATING SYSTEM - A system for controlling a grid connected power generating system is provided. The system includes a wind turbine, a converter, a first controller and a second controller. The wind turbine supplies electrical power to a power grid and the converter couples the wind turbine to the power grid. The first controller calculates voltage commands to emulate a phasor back electromotive force behind an inductance. The controller further generates converter switching commands from the voltage commands. The voltage commands include a voltage magnitude reference and an internal frequency reference calculated from a power imbalance between an active power reference and the electrical power. The second controller is used to limit a converter current. | 06-10-2010 |
20100195359 | Power Supply Circuit and Information Processing Apparatus - A power supply circuit includes a rectifying unit for outputting a rectified input voltage, a transformer for receiving the voltage and outputting an induced voltage based on the input voltage, a first smoothing unit for smoothing the induced voltage to output a first output voltage, a detecting unit for outputting an error signal corresponding to the difference between the first output voltage and a reference voltage, and an insulating unit for receiving the error signal and outputting a signal corresponding to the error signal. The input and output terminals of the insulating unit are insulated. The circuit also includes a controlling unit for outputting a control signal for selectively inputting the input voltage into the transformer on basis of the signal from the insulating unit, and also includes a switching unit connected to the transformer for selectively inputting the input voltage into the transformer, based on the control signal. | 08-05-2010 |
20110157937 | DC TO AC CONVERTER - A method and apparatus for converting DC electricity to AC electricity, the AC electricity having a sine wave shape. DC electricity is supplied to a pulse width modulator. A pulse width modulated signal is formed from the DC electricity, the pulse width modulated signal comprising a plurality of pulses, each pulse having a duration representing an amplitude of the sine wave during an interval of the sine wave represented by the pulse, the pulse width modulated signal comprising a plurality of pulses (or a pulse train) during one sine wave period. The sine wave is generated from the pulse width modulated signal, values of the sine wave during successive sine wave intervals responsive to the duration of the pulse that represents the sine wave interval. | 06-30-2011 |
20110211376 | SWITCHING CONTROL CIRCUIT AND SWITCHING POWER SUPPLY DEVICE - A switching control IC outputs a rectangular wave signal from an output terminal thereof to a driving circuit. A feedback circuit compares a value of a divided voltage of a voltage across output terminals of a switching power supply device with a reference voltage, generates a feedback signal, and inputs the feedback signal into a feedback terminal of the switching control IC. A capacitor and a Zener diode are connected between the feedback terminal and a ground terminal. The Zener diode is selectively connected, and a voltage at the feedback terminal is changed in accordance with the presence of the Zener diode. A voltage at the feedback terminal is detected, and one of a latch method and a hiccup method is selected as a method for an overcurrent protection operation in accordance with the detected voltage. | 09-01-2011 |
20110222324 | CONTROL CIRCUIT, POWER CONDITIONER INCLUDING THE CONTROL CIRCUIT, AND PHOTOVOLTAIC SYSTEM - A power conditioner of a photovoltaic system is configured operate at higher accuracy. A chopper circuit, a capacitor connected in parallel to the chopper circuit, and a control circuit that controls an ON/OFF status of switch elements in the chopper circuit to control charging and discharging of the capacitor are provided. The control circuit includes a measurement control section that measures an inter-end voltage of the capacitor and a control circuit section that performs a predetermined control operation from a measurement output of the measurement circuit section. The measurement circuit section includes a differential amplifier circuit that differentially amplifies the inter-end voltage of the capacitor. The circuit control section calibrates an in-phase component in the output of the differential amplifier circuit as an in-phase error and performs the control from the calibrated output from the differential amplifier circuit. | 09-15-2011 |
20110267857 | Method and apparatus for distributed power generation - A method and apparatus for generating AC power. In one embodiment, the apparatus comprises a DC/AC inversion stage capable of generating at least one of a single-phase output power, a two-phase output power, or a three-phase output power; and a conversion control module, coupled to the DC/AC inversion stage, for driving the DC/AC inversion stage to selectively generate the single-phase output power, the two-phase output power, or the three-phase output power based on an input power to the DC/AC inversion stage. | 11-03-2011 |
20120069614 | POWER SUPPLY SYSTEM AND METHOD INCLUDING POWER GENERATOR AND STORAGE DEVICE - The present invention relates to a power supply system and method including a power generator and a storage device. Specifically, the power supply method using a power supply system which includes a power generator, a storage device, a unidirectional converter, and a bidirectional interleaved converter, and in which the other side of the unidirectional converter is connected to the other side of the bidirectional interleaved converter and power is output from the other side of the unidirectional converter, the power supply method comprises measuring one or more of an amount of power generation of the power generator and an amount of power storage of the storage device; forming a power transfer path by analyzing one or more of the amount of power generation and the amount of power storage; and controlling activation of devices on the formed power transfer path. | 03-22-2012 |
20120087165 | APPARATUS AND METHOD FOR CONTROLLING A POWER INVERTER - An apparatus and method for controlling a DC-to-AC inverter is disclosed. The DC-to-AC inverter may be configured to convert DC power received from an alternative energy source to AC power for supplying an AC grid or load. The inverter may determine whether the power presently supplied by the alternative energy source is less than a predetermined amount of power and, if so, disable an output converter of the inverter. Additionally, the inverter may predict the voltage of a DC bus of the inverter at a future point in time and, if the predicted DC bus voltage is greater than a predetermined maximum DC bus voltage, enable the output converter to transfer energy from the DC bus to the AC grid to reduce the DC bus voltage. | 04-12-2012 |
20120106214 | CIRCUIT FOR CONVERTING DC INTO AC PULSED VOLTAGE - The present invention proposes a circuit for converting DC into AC pulsed voltage. The circuit comprises two controllable semiconductor switches. By controlling the opening and closing of the semiconductor switches, the circuit can operate in different modes, i.e. high input voltage mode and low input voltage mode. The circuit for converting DC into AC pulsed voltage, proposed in the present invention, is suitable for a wide input voltage range. When the circuit is used as the driver circuit of a DBD lamp, the DBD lamp can still operate normally by switching to low-voltage DC supply in case of an AC supply failure, and the DBD lamp has a higher luminous efficiency. | 05-03-2012 |
20120120694 | POWER CONDITIONER FOR PHOTOVOLTAIC POWER GENERATION - Power generated by a solar battery of thin-film type is stepped up to a predetermined DC voltage by a step-up chopper circuit, and the predetermined DC voltage is converted into three-phase AC power by an inverter circuit, and the three-phase AC power is supplied to an AC power supply system via an output DC voltage circuit. The solar battery is not grounded, and a negative electrode thereof has a floating capacitance between the negative electrode and the ground. The AC power supply system is configured by three-phase star-connection, and the neutral point is grounded. The output DC voltage circuit includes three batteries, and the batteries are provided, for the respective phases, between the AC power supply system and a sine wave filter connected to the AC output side of the inverter circuit. Therefore, it is possible to prevent acceleration of the deterioration of the solar battery. | 05-17-2012 |
20120206948 | DEVICE AND METHOD FOR CONVERTING DIRECT CURRENT INTO ALTERNATE CURRENT - The device for converting direct current into alternate current comprises a multilevel converter associated with at least a source of direct current and a modulation unit having piloting means for piloting the converter for the conversion of the direct current into an alternate output current, in which the modulation unit comprises comparison means for comparing the output current value with a preset positive threshold value and a preset negative threshold value, the piloting means being suitable for piloting the converter with a pulse modulation of the unipolar type in the event of the output current value being above the positive threshold value or below the negative threshold value and with a pulse modulation of the complementary type in the event of the output current value being below the positive threshold value and above the negative threshold value. The method for converting direct current into alternate current comprises a piloting phase of a multilevel converter for the conversion of a direct voltage into an alternate output voltage, a comparison phase of the output current value with a preset positive threshold value and a preset negative threshold value, the piloting phase being suitable for piloting the converter with a pulse modulation of the unipolar type in the event of the output current value being above the positive threshold value or below the negative threshold value and with a pulse modulation of the complementary type in the event of the output current value being below the positive threshold value and above the negative threshold value. | 08-16-2012 |
20120218795 | PULSE WIDTH MODULATED CONTROL FOR HYBRID INVERTERS - A single-phase hybrid multilevel inverter is described that combines a 3-level leg and a 2-level leg to reduce the number of overall switching devices for a 5-level inverter. The 2-level inverter leg switches at a fundamental frequency and the 3-level flying capacitor leg uses PWM modulation to switch resulting in a low THD output voltage spectrum. The control method developed for the single-phase inverter is used to build a three-phase inverter comprised of three single-phase hybrid inverters in order to achieve a line-to-neutral voltage having five levels and a line-to-line voltage having nine levels. | 08-30-2012 |
20130051099 | Inverter Device - An inverter device includes: an inverter circuit which includes an upper-arm-use first switching element ( | 02-28-2013 |
20130077367 | SYSTEMS AND METHODS FOR USE IN GRID FAULT EVENT CONTROL - System, power modules, and methods for supplying an output voltage to an electric grid are provided. One example power module includes a switching device configured to supply an output from a power generator to an electric grid, a feedback unit configured to provide a feedback signal indicative of a deviation of a parameter associated with the electric grid, and a controller coupled to the feedback unit and the switching device. The controller is configured to adjust a reactive current of the output in response to at least one grid fault event to ride through the at least one grid fault event, to modify the deviation provided from the feedback unit, to control the switching device based on the modified deviation, and to detect an islanding condition based on the parameter associated with the electric grid. | 03-28-2013 |
20130088902 | PROPORTIONAL BIAS SWITCH DRIVER CIRCUIT - A switch bias system is provided that includes a bipolar junction transistor (BJT) switch comprising a base, emitter, and collector; a current sense circuit coupled to the emitter, the current sense circuit configured to sense current flow through the emitter of the BJT switch; and a proportional bias circuit configured to generate a bias current to the base of the BJT switch, the bias current set to a fixed proportion of the sensed current flow through the emitter of the BJT switch. | 04-11-2013 |
20130094260 | Multi-Level DC/AC Converter - The multi-level DC/AC converter, comprising: an input ( | 04-18-2013 |
20130107594 | METHODS AND SYSTEMS FOR OPERATING A POWER CONVERSION SYSTEM | 05-02-2013 |
20130141957 | POWER CONVERSION DEVICE - An electrode pattern is arranged near an output pattern, a leakage current leaked from the output pattern is detected by a leakage-current detection circuit via the electrode pattern, and a light emitting diode is driven based on a detection result of the leakage-current detection circuit, thereby notifying an operation state of an inverter. | 06-06-2013 |
20130163301 | POWER CONVERSION APPARATUS - A power conversion apparatus includes a comparison circuit which compares a determination element related to a loss in the power converter with a switching reference value and outputs a determination instruction when a difference has occurred between them, a determination circuit which outputs a two-level operation switching instruction when the determination element is greater than or equal to the switching reference value, and a switching circuit which, when having received a two-level operation switching instruction, turns off the alternating-current switch and turns on the valve devices in the arm sequentially, thereby bringing the power converter into a two-level operation state. | 06-27-2013 |
20130176759 | FUEL CELL SYSTEM - A fuel cell system includes: a converter disposed between a fuel cell and a load to increase an output voltage of the fuel cell; and a control unit that controls the converter at a predetermined duty ratio, wherein the control unit determines a duty command value for the converter from a feed-forward duty and a feed-back duty which are calculated using a command value of a reactor current that flows through a reactor in the converter and/or using a measurement value of the reactor current. In a low-load operation, the control unit sets, as a measurement value of the reactor current, a value obtained by multiplying a midpoint measurement value measured at an intermediate time of an on-duty period by a predetermined coefficient. | 07-11-2013 |
20130229843 | CURRENT-SOURCE POWER CONVERTING APPARATUS - A current-source power converting apparatus according to an embodiment includes an inverter and a drive controller. The inverter includes, in every output phase, a plurality of switching elements that are serially connected between the positive pole and the negative pole of a direct current source. The drive controller controls the inverter in accordance with a current command in an output mode of controlling the switching elements of different output phases for supplying current between the output phases and a short circuit mode of controlling the switching elements of the same output phase. An output phase in which the drive controller executes the short circuit mode is an output phase whose phase voltage or phase current has the minimum absolute value. | 09-05-2013 |
20130265808 | Power Inverter - A power inverter includes a power semiconductor module that includes a power semiconductor device, a control circuit board that outputs a control signal used for controlling the power semiconductor device, a driver circuit board that outputs a driving signal used for driving the power semiconductor device, a conductive metal base plate arranged in a space between the driver circuit board and the control circuit board in which a fine and long opening portion is formed, wiring that connects the driver circuit board and the control circuit board through the opening portion and delivers the control signal to the driver circuit board, and an AC busbar that is arranged on a side opposite to the metal base plate through the driver circuit board and delivers an AC current output from the power semiconductor module to a drive motor. At least a portion of the AC busbar that faces the opening portion extends in a direction directly running in a longitudinal direction of the fine and long opening portion. | 10-10-2013 |
20140043881 | POWER CONVERTER WITH PREEMPTIVE PROTECTION - Among many embodiments, a power conversion apparatus and a method for converting power are disclosed. The power conversion apparatus may include switching components configured to create an alternating current; a preemptive detector arranged and configured to provide, in advance of the alternating current reaching a zero-crossing, a control signal responsive to the alternating electrical current approaching the zero-crossing; and a controller configured, at least in part, to change a state of the switching components before the zero crossing, in response to the control signal. | 02-13-2014 |
20140049997 | TRANSFORMERLESS MULTIPLE OUTPUT CAPABLE POWER SUPPLY SYSTEM - An energy efficient apparatus includes a switching device, a frequency dependent reactive device, and a control element is provided. The switching device is coupled to a source of electrical power and includes a pair of transistors and is adapted to receive a control signal and to produce an alternating current power signal. The frequency of the alternating current power signal is responsive to the control signal. The frequency dependent reactive device is electrically coupled to the pair of transistors for receiving the alternating current power signal and producing an output power signal. The frequency dependent reactive device is chosen to achieve a desired voltage of the output power signal relative to the frequency of the alternating current power signal. The control element senses an actual voltage of the direct current power signal and modifies the control signal delivered to achieve the desired voltage of the direct current power signal. | 02-20-2014 |
20140049998 | DC to AC Power Converter - A direct current to alternating current converter method and apparatus is disclosed that may comprise a direct current (DC) input source; an alternating current (AC) output inverter circuit, having an input connected across the DC input source; a partial power DC-DC boosting circuit intermediate to the DC input source and the DC input of the inverter stage, configured to increase the input voltage of the DC input source whenever the input voltage falls below a minimum required to synthesize an output waveform of a selected shape and a partial power DC-DC boosting circuit intermediate to the DC input source and the DC input of the inverter stage, configured to increase the input voltage of the DC input source during higher amplitude portions of inverter circuit output voltage waveform. | 02-20-2014 |
20140049999 | Modulation Of Switching Signals In Power Converters - There is provided a method and control system for reducing noise in a power converter by controlling a switching device in the power converter according to a modulation scheme. The switching device couples a direct current (DC) source to provide an alternating current (AC) output at a particular switching frequency. The method comprises the step of, in each switching period, switching the switching device between active configurations providing a finite voltage at the output and inactive configurations providing a zero voltage at the output. The ratio between the total period of time in which the switching device is in an active configuration and the total period of time in which the switching device is in an inactive configuration is the same for each switching period and is determined according to the desired voltage at the AC output. | 02-20-2014 |
20140056044 | PHOTOVOLTAIC INVERTER AND A CONTROL METHOD THEREOF - A photovoltaic inverter includes an input circuit, a decoupling circuit and an output circuit. The input circuit has a DC input port, an input capacitor, a magnetizing inductor, a first unidirectional element and a first switch. The magnetizing inductor forms first and second connection nodes. The decoupling circuit has a second unidirectional element, a second switch, a third switch, a third unidirectional element and a decoupling capacitor. The second unidirectional element and the second switch are connected in series at a first node. The third switch and the third unidirectional element are connected in series at a second node. The output circuit has a transformer, a fourth unidirectional element, a fourth switch, an output capacitor, a fifth switch, a fifth unidirectional element, an output inductor and an AC output port. The transformer includes an input port and first and second output ports. A control method of the inverter is disclosed. | 02-27-2014 |
20140078799 | INVERTER MODULATOR WITH VARIABLE SWITCHING FREQUENCY RESPONSIVE TO A SENSED PARAMETER - An inverter control is used to control the output of a distributed power generating station, such as a photovoltaic (PV) solar power station, connected to a power grid. The power station is connected to an inverter output. Pulse width modulation is used to shape the output in order to maximize power output within power quality parameters and provides control of a switching frequency of the inverter responsive to a sensed parameter. The technique allows an increase in output efficiency and provides for adjustment of power output to meet power quality parameters to an extent required in order to connect to the power grid. | 03-20-2014 |
20140092658 | POWER CONVERSION APPARATUS - A power conversion apparatus includes a power converter and a PWM controller. A first switching element is coupled to a positive pole of a DC power source and one terminal of a load. A second switching element is coupled to a negative pole of the DC power source and another terminal of the load. A third switching element is coupled to the positive pole and the other terminal. A fourth switching element is coupled to the negative pole and the one terminal. The PWM controller PWM-controls the power conversion apparatus to repeat an on-period during which the DC power source outputs a voltage to the load and an off-period during which no voltage is output. The PWM controller alternately controls the first and second switching elements based on a signal set at a high or low level any time during a carrier wave period. | 04-03-2014 |
20140140116 | SWITCHING CONVERTER AND METHOD FOR CONTROLLING THE SWITCHING CONVERTER - A switching converter and method for controlling a switching converter in a quasi resonant mode of operation, wherein a sense voltage is predefined for a PWM controller to determine a switch off time of a switching element, a switch-on time of the switching element also falls in a valley of an oscillating voltage that is being applied to the switched-off switching element, and where the sense voltage is reduced in each valley occurring after a switch-off operation such that a stable operating point is thus reached under any load. | 05-22-2014 |
20140153302 | 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. | 06-05-2014 |
20140160818 | SYSTEMS AND METHODS FOR CONTROLLING AN ELECTRICAL POWER SUPPLY - Systems and methods for controlling an electrical power supply are provided. One system includes an input configured for receiving voltage measurement signals for the power supply and a controller for one or more electrical phases of the power supply. The controller includes an integrator configured to integrate the received voltage measurement signals and to generate integrated control signals or integrated error signals. The controller is configured to generate an output signal using the integrated control signals or the integrated error signals. The system also includes an output configured to output the output signal to control switching of the power supply. | 06-12-2014 |
20140218985 | Control of Energy Storage System Inverter System in a Microgrid Application - A system that manages a supplemental energy source connected to a power grid uses a two stage control strategy to manage power transfers in and out of the power grid as well as in and out of an energy storage system, such as a battery bank. One stage uses a non-linear transfer function to control an output frequency of a DC-to-AC inverter to limit undesired effects of power transients that occur on the grid. A second stage uses control strategy for transferring energy between the energy storage system and an internal DC link based on a relationship between a voltage on a DC link connecting the first and second stages and a DC link reference voltage, the voltage on the DC link, and a voltage at the energy storage system. The control strategy includes rapid charging, over-charging protection, and grid transient stabilization. | 08-07-2014 |
20140268958 | INVERTER COMMUNICATIONS USING OUTPUT SIGNAL - Technologies for communicating information from an inverter configured for the conversion of direct current (DC) power generated from an alternative source to alternating current (AC) power are disclosed. The technologies include determining information to be transmitted from the inverter over a power line cable connected to the inverter and controlling the operation of an output converter of the inverter as a function of the information to be transmitted to cause the output converter to generate an output waveform having the information modulated thereon. | 09-18-2014 |
20140307494 | POWER DECOUPLING CONTROLLER AND METHOD FOR POWER CONVERSION SYSTEM - A power conversion system is disclosed including a DC bus for receiving DC power, a power converter for converting the DC power to AC power, and a controller. The controller includes an active power regulator for generating a phase angle command signal, a reactive power regulator for generating a voltage magnitude command, and an active power (P) and reactive power (Q) decoupling unit for decoupling interaction between the active and reactive power regulators. The PQ decoupling unit includes an active power compensation element and a reactive power compensation element. The active power compensation element is used for generating a phase angle compensation signal based on a reactive power error signal, to compensate the phase angle command signal. The reactive power compensation element is used for generating a voltage magnitude compensation signal based on an active power error signal, to compensate the voltage magnitude command signal. | 10-16-2014 |
20140328099 | CONTROL CIRCUIT FOR POWER CONVERTER AND METHOD THEREOF - A control circuit for a power converter includes a pulse width modulation signal generating circuit, a power estimation circuit, and a current limiting signal generating circuit. The pulse width modulation signal generating circuit generates pulse width modulation signals according to a current sense signal and a current limiting signal for configuring the conduction status of a switch circuit of the power converter. The power estimation circuit generates a power estimation signal for estimating the power which the power converter provides to a load. The current limiting signal generating circuit generates the current limiting signal according to the power estimation signal so that the power converter may provide suitable power to the load. | 11-06-2014 |
20140334206 | METHOD FOR BALANCING CAPACITORS IN AN INVERTER - The PWM modulating method comprises the following steps: detecting actual voltage values (Vc1, Vc1, Vc2, Vc3 . . . ) across bulk capacitors (C | 11-13-2014 |
20140355317 | APPARATUS AND A METHOD FOR ENHANCING POWER OUTPUT - An apparatus and a method for enhancing power output, the apparatus comprising: a thyristor having an anode, a cathode and a gate; and a controller connected to the gate, the cathode and the anode wherein, when the anode is provided with a voltage, the controller is configured for activating the thyristor to allow current flow between the anode and the gate in a first instance and is configured for activating the thyristor to allow current flow between the gate and the cathode in a second instance so as to provide the cathode with an enhanced voltage, the enhanced voltage being an enhancement of the voltage at the anode. | 12-04-2014 |
20140355318 | FEED-IN/FEEDBACK CONVERTER - A method of controlling a frequency converter comprises steps for measuring phase currents flowing in a three-phase supply network, for generating a first modulation space vector that comprises an angle that is synchronous to a supply voltage of the three-phase supply network and a determined modulation index as an amplitude, for generating a third modulation space vector depending on the first modulation space vector and the measured phase currents and for modulating the frequency converter according to the third modulation space vector. | 12-04-2014 |
20140362623 | Control Method, Control Device And Mobile Electric Power Storage Apparatus - The invention is a control method and a control device for determining components of a control voltage of an inverter adapted for feeding power to a grid, in the course of which a vector direction (θ*) of a voltage of the grid is determined, on the basis of active power and reactive power of the grid, current reference signal components (i | 12-11-2014 |
20140369099 | POWER CONVERTER INCLUDING SMOOTHING CAPACITOR AND DISCHARGE RESISTOR - A power converter includes a body including a switching element; a plurality of semiconductor modules each having a control terminal projected from the body; a circuit board controlling the switching element; a cooler that cools the semiconductor modules; a smoothing capacitor smoothing direct-current voltage applied to the switching element; a discharge resistor disposed on a surface of the circuit board and electrically connected parallel to the smoothing capacitor. The semiconductor modules are mounted on the circuit board with the control terminal, the discharge resistor includes a first connecting portion at one end of the discharge resistor in a longitudinal direction thereof and a second connecting portion at an other end of the discharge resistor in the longitudinal direction, and the first connecting portion is connected to the control terminal via a wiring pattern provided on the surface of the circuit board. | 12-18-2014 |
20150009732 | CONTROL UNIT FOR AN INVERTER LOADED BY A RESONANT LOAD NETWORK - An inverter may include at least two switching means for feeding a series oscillator circuit from a source, wherein a control device of the inverter controls the switching means in such a way that: in a first mode A, the inverter feeds the oscillator circuit via the switching means from the source; and in a second mode B, the oscillator circuit is decoupled from the source, wherein the control device switches back and forth between the two modes A and B to set a reference current in the oscillator circuit or a reference voltage on the oscillator circuit. | 01-08-2015 |
20150009733 | POWER SUPPLY SYSTEM AND POWER SOURCE APPARATUS - A power supply system that comprises an electrical storage device; a power conversion circuit configured to convert a power from the electrical storage device into converted DC power; and a power control unit configured to receive the converted DC power and output AC power. The converted DC power is controlled such that the output AC power is a predetermined AC power. | 01-08-2015 |
20150062988 | HYBRID ZERO-VOLTAGE SWITCHING (ZVS) CONTROL FOR POWER INVERTERS - A power inverter combination includes a half-bridge power inverter including first and second semiconductor power switches receiving input power having an intermediate node therebetween providing an inductor current through an inductor. A controller includes input comparison circuitry receiving the inductor current having outputs coupled to first inputs of pulse width modulation (PWM) generation circuitry, and a predictive control block having an output coupled to second inputs of the PWM generation circuitry. The predictive control block is coupled to receive a measure of Vin and an output voltage at a grid connection point. A memory stores a current control algorithm configured for resetting a PWM period for a switching signal applied to control nodes of the first and second power switch whenever the inductor current reaches a predetermined upper limit or a predetermined lower limit. | 03-05-2015 |
20150085543 | Inverter with Dual-Range Load Sensing - An inverter assembly includes an inverter and a load sensor. The inverter is configured to provide electrical power to a load. The load sensor has a first amplifier for sensing current of the load when the load is a low power load connected to the inverter and a second amplifier for sensing the load current when the load is a high power load connected to the inverter. Vehicle functionality such as start/stop functionality may be disabled while the load sensor senses that the load is connected to the inverter whereas the start/stop functionality may be disabled while the load sensor senses that the load is not connected to the inverter. | 03-26-2015 |
20150109836 | Power Conversion System and Method for Detecting Isolated Operation of the Same - A power conversion system is capable of distinguishing easily and clearly between being interconnected to the power system and being in an isolated operation. The power conversion system converts DC power to AC power to interconnect with a power system and injects reactive power into a grid node for determining an isolated operation, including: a voltage detector that detects an output voltage at the grid node; a current detector that detects an output current at the grid node; a frequency measurement unit that measures a frequency of the output voltage at the grid node; a reactive-power measurement unit that measures reactive power at the grid node; and an isolated-operation determination unit that determines whether or not the power conversion system is in an isolated operation as disconnected from the power system. The isolated-operation determination unit includes a reactive-power-fluctuation determination unit that performs a first isolated-operation determination from the reactive power. | 04-23-2015 |
20150124502 | DRIVING APPARATUS FOR DRIVING SWITCHING ELEMENTS OF POWER CONVERSION CIRCUIT - A driving apparatus for driving switching elements of a power conversion circuit. In the apparatus, a first determination unit determines whether or not a dead time that occurs immediately after a setting of discharge rate is changed is greater than the dead time assumed at the time of designing. When the dead time occurring immediately after the setting of discharge rate is changed is greater than the dead time assumed at the time of designing, a shift unit shifts in time at least one of transition to an OFF state of one of the upper-arm and lower-arm switching elements and transition to an ON state of the other of the upper-arm and lower-arm switching elements immediately after the transition to the OFF state so as to reduce a time difference between the transition to the OFF state and the transition to the ON state. | 05-07-2015 |
20150146462 | CURRENT SOURCE POWER CONVERSION APPARATUS AND CURRENT SOURCE POWER CONVERSION METHOD - When first drive signals are driving signals for applying a short-circuit mode for turning on a plurality of switching elements of the same output phase, the current source power conversion apparatus according to one embodiment generates second drive signals for applying the short-circuit mode to an output phase having the smallest absolute value of a phase voltage, and switches the first drive signals to the second drive signals. | 05-28-2015 |
20150303825 | POWER CONVERTER - An operation area of a motor is increased without increasing the capacity of a switching element. A current limiter which limits a current flowing in switching elements to prevent the current from exceeding a predetermined current limit value is provided. A current limit value controller which decreases the current limit value if a loss generated in the switching elements increases at a same current value, and increases the current limit value if the loss decreases at a same current value, is provided. | 10-22-2015 |
20150303826 | Neutral Point Clamped Multilevel Converter - A neutral point clamped, multilevel level converter includes a DC voltage link; a first capacitor coupling one side of the DC link to a neutral point; a second capacitor coupling another side of the DC link to the neutral point; a plurality of phase legs, each phase leg including switches, each phase leg coupled to an AC node; a current sensor associated with each AC node; and a controller generating a PWM signal to control the switches, the controller generating a current zero sequence component in response to current sensed at each of the current sensors, the controller adjusting a modulation index signal in response to the current zero sequence component to produce the PWM signal. | 10-22-2015 |
20150303827 | CONTROLLER FOR GRID TIED INVERTER SYSTEM - The present invention relates to a controller for a grid tied inverter system with an improved control configuration for increasing response speed of an output current according to specific electric power required. The controller comprises a first control circuit section to output a direct current (DC)-DC converter control signal, and a second control circuit section to output an inverter control signal, wherein the first control circuit section and the second control circuit section are independent of each other without a link for signal input and output therebetween. | 10-22-2015 |
20150311819 | INVERTER DEVICE - An inverter device includes a three-phase inverter, which has switching elements, and a controller, which is programmed to perform two-phase modulation control on switching of the switching elements between an ON state and an OFF state. The controller computes the power factor of a load. The controller determines whether or not the computed power factor is less than a preset threshold value. If the computed power factor is greater than or equal to the threshold value, the controller performs a phase shift to shift the central time point of an ON period or an OFF period for two phases other than a stop phase in the two-phase modulation control by 180 degrees, and if the computed power factor is less than the threshold value, the controller supplies the switching elements with ON and OFF control commands to perform the two-phase modulation control without performing the phase shift. | 10-29-2015 |
20150311820 | POWER CONVERTER - A power inverter device includes an inverter that converts a direct-current (DC) power to an alternating-current (AC) power having an output AC voltage, and a capacitor circuit electrically connected to the inverter. The capacitor circuit is operable to start supplying a capacitor voltage to the inverter at a time point when a predetermined waiting time lapses from a zero cross point of the output AC voltage at a starting up of the inverter circuit, wherein the capacitor voltage has a phase shifted by π/4 radian from the output AC voltage. The inverter is operable to generate the output AC power based on the capacitor voltage and the DC power. The predetermined waiting time is a duration is equal to 2πn+3π/4 radian or 2πn+7π/4 radian of a phase of the output AC voltage (n is an integer not smaller than zero). This power inverter device can reduce a ripple power of the input power early after the starting-up. | 10-29-2015 |
20150311821 | SWITCHING CONTROL APPARATUS - A switching control apparatus is applied to a load drive system that includes a DC voltage converter having a reactor and at least one switching element, and a power transducer including multiple switching element pairs. The switching control apparatus controls a switching timing of the switching element in the DC voltage converter and the switching element pairs in the power transducer. The switching control apparatus includes a DC voltage converter control circuit, a DC voltage converter drive circuit, a power transducer control circuit, a power transducer drive circuit, a switching prohibition period calculation portion, and a switching correction portion. | 10-29-2015 |
20150318793 | CONVERTER APPARATUS - A converter apparatus is presented which includes a converter that includes a switching element and an inductor, a controller that sets a duty at a predetermined duty setting cycle, and executes an ON/OFF switching of the switching element of the converter at switching timing according to a relationship between the set duty and a carrier signal, the predetermined duty setting cycle corresponding to a half cycle of the carrier signal. The controller determines the duty to be set at this duty setting cycle such that sampling of a current value of a current flowing through the inductor and calculation of the duty to be set at the next duty setting cycle based on the sampled current value are completed before next duty setting timing. | 11-05-2015 |
20150318796 | INVERTER INRUSH CURRENT LIMITING - A method and circuit arrangement is described for start-up and shut-down of high power DC to AC inverters which limits inrush current for capacitor charging, reduces input and output relay contact stress and discharges internal capacitors upon shut down. A preferred inrush limiting component has a higher resistance when hot than when cold, such as an incandescent filament lamp. | 11-05-2015 |
20150326144 | DC-ELIMINATING CURRENT CONTROLLER FOR GRID-CONNECTED DC/AC CONVERTERS - Systems, methods, and devices which eliminate the DC current from the output of grid-connected inverters. A current controller is provided which interfaces with a grid-connected DC/AC inverter. The current controller uses a nonlinear adaptive filter which receives, as input, the output current of the inverter along with grid current frequency. The nonlinear adaptive filter estimates the DC value of the grid current and, in conjunction with an integrator, removes this DC current component. This is done by adjusting the duty cycle of the grid-connected inverter. | 11-12-2015 |
20150357936 | METHOD FOR VOLTAGE DIP COMPENSATION OF INVERTER - Disclosed is a method for voltage dip compensation of inverter, the method including reducing an output frequency of an inverter to obtain a regenerative energy when it is determined that power failure has occurred during the inverter operation, adjusting increase/decrease of inverter output frequency in response to size of exceeding current and voltage based on an output current and DC-link voltage of the inverter, increasing the inverter output frequency in order to prevent excessive current flow when power restoration occurs at a power failure state, and returning to a speed prior to the momentary voltage dip by gradually increasing the inverter output frequency in a state where the inverter output frequency does not exceed an over-current limit by monitoring the inverter output frequency. | 12-10-2015 |
20150357937 | THREE-PHASE POWER CONVERSION DEVICE - A three-phase power conversion device includes: single-phase inverters having AC output ends connected in series to the respective phases of the three-phase AC lines; a control device for performing PWM control for each single-phase inverter based on a voltage command V*; and an AC voltage detection circuit for detecting a phase and a voltage amplitude of three-phase AC voltage. The control device adds a zero-phase component Vo common to the three phases to a basic command Vx* for each phase to generate a voltage command V*. The zero-phase component Vo is generated by applying an amplitude a calculated based on the phase and the voltage amplitude to reference zero-phase voltage Voo that has been set, thereby reducing a peak of the voltage command V* for each single-phase inverter. | 12-10-2015 |
20150381073 | Inverter Control Method, Apparatus and System - An inverter control method, apparatus, and system are provided. The method in the embodiments of the present invention includes obtaining power distribution line graph of an inverter switch according to an output power and an input voltage that are of an inverter; when an area to which the inverter belongs is a first area and the inverter switch works at a second frequency, switching the inverter switch to a first frequency; and when the area to which the inverter belongs is a second area and the inverter switch works at the first frequency, switching the inverter switch to the second frequency. In the embodiments of the present invention, whether a working frequency of an inverter switch needs to be changed is determined according to an output power and an input voltage, which improves control efficiency, thereby effectively improving conversion efficiency of an inverter. | 12-31-2015 |
20160020706 | METHOD FOR CONTROLLING AN INVERTER, AND INVERTER - The invention relates to a method for controlling an inverter and to an inverter a DC/DC stage, which comprises at least one main switch (S2) and a discharge circuit, and with a DC/AC stage. The discharge circuit is formed by a series connection of a bidirectional switching element, which comprises two switches (SA1, SA2), and an inductivity. A device is provided for controlling the switches (SA1, SA2) and is designed such that one switch (SA1, SA2) is activated in an alternating manner and the switch-on time of the switch is determined by the controlling device prior to a switch-off time of the main switch (S2). | 01-21-2016 |
20160072404 | SYNCHRONOUS BUCK INVERTER - A power inverter, such as a synchronous buck power inverter, that is configured with a high frequency switching control having a (PWM) controller and sensing circuit. Controller provides a low frequency oscillating wave to effect switching control on a synchronous-buck circuit portion that includes a plurality of switches to invert every half cycle of the frequency provided by controller. The inverting process thus creates a positive and negative transition of the oscillating wave signal. A low frequency switching stage includes a further plurality of switches configured to operate as zero voltage switching (ZVS) and zero current switching (ZCS) drives Charge on an output capacitor is discharged to zero on every zero crossing of low frequency switching stage and advantageously discharges energy every half cycle. During this discharge of energy, the zero crossing distortion in the low frequency sine wave is greatly reduced. | 03-10-2016 |
20160072405 | GATE DRIVING CIRCUIT, SEMICONDUCTOR DEVICE, AND POWER CONVERSION DEVICE - A gate driving circuit of embodiments is provided with a first transistor which controls a gate-on voltage applied to a gate electrode of a switching device, a second transistor which controls a gate-off voltage applied to the gate electrode of the switching device, a driving logic circuit which controls turn-on/turn-off of the first and second transistors, a first power source which supplies the gate-on voltage to the gate electrode when the first transistor is turned on, a second power source which supplies the gate-off voltage to the gate electrode when the second transistor is turned on, a first gate resistance variable circuit in which a plurality of field effect transistors is connected in parallel, a second gate resistance variable circuit in which a plurality of field effect transistors is connected in parallel, and a gate resistance control circuit which controls gate voltages of a plurality of field effect transistors. | 03-10-2016 |
20160094149 | OBSERVER-BASED CONTROL SYSTEM FOR GRID-CONNECTED DC/AC CONVERTERS WITH LCL-FILTER - Systems, methods, and devices related to controlling a DC/AC converter. A control system uses a nonlinear adaptive observer to estimate the state variables i | 03-31-2016 |
20160099662 | Method and Circuit for the Improved Use of Capacitance in an Intermediate Circuit - The disclosure relates to a method and a circuit for the improved use of a capacitance in an intermediate circuit. According to the disclosure, a change in a voltage in an intermediate circuit is detected and electrical energy is actively provided depending on the change in the electrical variable in order to compensate the change. According to the disclosure, a capacitance used in the intermediate circuit can end up significantly smaller if the electrical energy fed in is used, in that the voltage of the capacitance is supported by a current fed into the capacitance on the earth side. | 04-07-2016 |
20160105127 | POWER CONVERSION DEVICE CONTROL DEVICE AND POWER CONVERSION DEVICE CONTROL METHOD - Provided are a power conversion device control device and a power conversion device control method, which are capable of reducing harm to other electronic devices and electromagnetic noise due to a switching frequency compared to the related art. Carrier change patterns of the respective phases, which are defined by parameters of an average switching frequency, a spectral diffusion index, and a repetition frequency, are generated so that at least the carrier change pattern of one phase differs from the carrier change patterns of the other phases. Semiconductor switching elements are controlled as instructed by duty command values while the switching frequency is switched for each phase separately, from one frequency to another sequentially based on carriers output in patterns that follow the generated carrier change patterns. | 04-14-2016 |
20160105128 | Robust single-phase DC/AC inverter for highly varying DC voltages - A single-phase DC/AC inverter has a single-phase inverter bridge with binary switches connected to an RLC low-pass filter. Digital control logic in a control circuit (or in a microcontroller) determines and controls a logic state q determining the position of the switches in the inverter bridge from sensed i | 04-14-2016 |
20160111975 | CONTROL DEVICE OF NEUTRAL-POINT-CLAMPED POWER CONVERTER APPARATUS, AND CONTROL METHOD OF NEUTRAL-POINT-CLAMPED POWER CONVERTER APPARATUS - According to one embodiment, there is provided a control device of a neutral-point-clamped power converter apparatus including a converter configured to convert current which were obtained by passing a d-axis current and a q-axis current of a rotating coordinate system through a filter having a time constant which is greater than an inverse number of a fundamental wave frequency of a three-phase currents, to three-phase currents, and a controller configured to calculate, based on the three-phase currents converted, a zero-phase voltage instruction value for controlling voltages into which a DC input voltage is divided at a neutral point, as an instruction value which is superimposed on three-phase voltage instruction values. | 04-21-2016 |
20160126861 | ADJUSTABLE PWM METHOD TO INCREASE LOW SPEED STARTING TORQUE AND INVERTER VOLTAGE MEASUREMENT ACCURACY - Methods, control apparatus and computer readable mediums are presented for controlling a switching inverter in which a controller selectively suspends PWM carrier signals to provide inverter switching control signals using zero vectors in response to a maximal pulse width value for a present PWM half cycle being greater than a threshold value, and accumulates a present output control value for individual output phases for use in a subsequent PWM half cycle for selective effective reduction in switching frequency for low-speed operation while maintaining high frequency control loop sampling. | 05-05-2016 |
20160141978 | CONTROL APPARATUS FOR PHOTOVOLTAIC INVERTER - There is provided a control apparatus for a photovoltaic inverter. The control apparatus includes a system voltage detector, a DC voltage detector that detects a DC voltage applied to the inverter, an output voltage deficiency detector that detects an output voltage deficiency of the inverter based on the system voltage and the DC voltage, an output-current detector, an output-current distortion detector that detects distortion of the output current based on a harmonic included in the output current, a MPPT controller, and an output-current distortion controller that performs control to set the DC voltage applied to the inverter to a voltage at a power point less than a maximum power point when the output voltage deficiency is detected and the distortion of the output current is detected. | 05-19-2016 |
20160190956 | Method And Apparatus For Controlling A Multilevel Soft Switching Power Converter - A system for controlling a multilevel soft switching power converter including a DC bus, a pair of switching arms, and a controller is disclosed. The DC bus has a positive rail and a negative rail operable to have a voltage potential present across the DC bus. Each switching arm is connected between the positive rail and the negative rail and includes four soft switches. Each soft switch is connected between the positive rail, the negative rail, or one of three intermediate connections between the positive and negative rails. Each soft switch is also controlled by a gating signal. A flying capacitor is connected between the first intermediate connection and the third intermediate connection and an output terminal is connected at the second intermediate connection of each switching arm. A controller is operable to generate each of the gating signals utilizing at least three control routines. | 06-30-2016 |
20180026549 | METHOD AND DEVICE FOR CONTROLLING OPERATION OF INVERTER | 01-25-2018 |