Abstract: A sequential switching shunt regulator cell comprising: a power line (PL) for connecting a power source (SA) to a power bus (PB); a shunting (SSW) switch for shunting said power line; and driving means (DM) for opening or closing said shunting switch depending on an error signal (MEA) indicative of a voltage level of said power bus; characterized in that it also comprises: a non-redundant rectifier (D3) connected in series to said power line for disconnecting the power bus from the shunting switch when the latter is closed; and a fault detector (FD) for detecting a short-circuit fault condition of said non-redundant rectifier, and for opening the shunting switch in reply to said condition. Advantageously, the rectifier can be a synchronous rectifier. A solar power regulator comprising a plurality of solar arrays connected to a power bus through respective sequential switching shunt regulator cells of the kind described above.

Abstract: A method and apparatus for converting a first power to a second power. In one embodiment the apparatus comprises a power conversion circuit for receiving the first power; and a controller, coupled to the power conversion circuit, for dynamically selecting between a non-interleaved mode and an interleaved mode for operating the power conversion circuit to convert the first power to the second power.

Abstract: An electrical conversion apparatus including a converter and an inverter comprises a capacitor that stores a DC electrical power; a ripple detection unit that detects a ripple of an active power that is output from the inverter; a voltage measuring instrument that measures a voltage across the capacitor; a DC voltage command generation unit that calculates a command value of the voltage across the capacitor according to a frequency of the AC voltage output from the inverter; and a DC voltage control unit that receives the voltage measured by the voltage measuring instrument and the command value calculated by the DC voltage command generation unit, to control the converter so that the voltage across the capacitor becomes the command value, wherein the DC voltage command generation unit makes the command value of the voltage across the capacitor higher than usual, within a predetermined range including a frequency of a ripple component of the voltage across the capacitor.

Abstract: A method of balancing current in a vehicle electric system having a system bus, a first battery, a first bi-directional battery voltage converter selectively transferring a first current between the first battery and the system bus, a second battery, a second bi-directional battery voltage converter selectively transferring a second current between the second battery and the system bus, and a controller controlling the first bi-directional battery voltage converter and the second bi-directional battery voltage converter. The method includes sensing the first current and sensing the second current. The first bi-directional battery voltage converter and the second bi-directional battery voltage converter are controlled so that the first current and the second current are equal portions of a load current supplied to an electrical load connected to the system bus.

Abstract: Disclosed is a method for suppressing a speed ripple occurring during an operation of an AC motor by using a torque compensator based on an activation function. The method includes the steps of calculating a speed error ?err based on a reference speed ?ref and an actual speed ?act; calculating a controller output Trm by using the speed error ?err as an input of a PI control and an operation of a compensated torque Tcom; and determining a torque variation based on the controller output Trm and a reference torque Tref and operating the torque variation in relation to an anti-windup gain Ka to use torque variation as an input of an integral (I) control. The method suppresses the speed ripple by compensating for the torque ripple through a controller which calculates the compensated torque by taking the signs of the speed error and the differential speed error into consideration.

Abstract: In one aspect of the present invention, a converter circuit with input voltage balance includes a plurality of modules having inputs electrically series-connected to each other and outputs electrically parallel-connected to each other and a plurality of switching circuits with each electrically connected to an input connection node of a corresponding module and its immediate next module, and configured such that when an input voltage of the corresponding module or its immediate next module is in a desired range from a first predetermine value to a second predetermined value greater than the first predetermined value, the switching circuit operates in an open state, while when the input voltage is out of the desired range, the switching circuit operates in a conductive state so as to regulate the input voltage of the corresponding module or its immediate next module in the desired range.

Abstract: This invention offers a power supply circuit that is capable of improving a power factor as well as reducing a ripple current of an input/output of the power supply circuit due to switching of a switching device. The power supply circuit is provided with a first power supply circuit including first and second switching devices, a second power supply circuit including third and fourth switching devices and a switching control circuit. The switching control circuit controls the switching devices so that the first switching device and the third switching device are turned on and off at timings different from each other when an alternating current voltage from an alternating current power supply is positive, and the second switching device and the fourth switching device are turned on and off at timings different from each other when the alternating current voltage is negative.

Abstract: A method of controlling at least one voltage converter having a plurality of cells in series, comprising an AC part and a DC part, characterized in that the AC input voltage (Vei) of each cell is determined directly by the use of a high speed current control loop relating to the AC part and a lower speed voltage control loop relating to the cells, the method including choosing the following voltage control law: ? i = C i 2 ? ( 2 R pi ? C i ? Z i + ? ? t ? Z i ? ? _ ? ? ref - K 1 ? Zi - K 2 ? Zi ? sign ? ( E Zi ) ) where: K1zi and K2zi are positive adjustment gains; Ci is the continuous capacitance of the capacitor Ci of each cell; Rpi is the losses associated with each cell; Zi—ref is the reference value of Zi=(UDCi)2, UDCi; being the direct voltage across the capacitor Ci; and EZi is such that EZi=Zi?Zi—ref.

Abstract: A system to control an asynchronous tri-phase motor may include a braking resistance coupled to receive output voltage from the voltage multiplier to dissipate energy when the system is in a braking mode. The system may further include a module to emit a pulse train (e.g., Pulse Width Modulation (PWM)) and having a frequency selectively determined by a microcontroller. The module may be operatively coupled to apply the pulse train to an H bridge circuit in the IGBT module, which is coupled to pass a conditioned line voltage to the tri-phase motor in response to the PWM pulse train applied to the H bridge circuit in the IGBT module.

Abstract: The power supply apparatus includes a plurality of voltage rising circuits each of which can be driven at a different duty ratio so as to convert and output a voltage output from a direct current power source according to a plurality of loads; and a control circuit which controls an input voltage from the direct current power source to each voltage rising circuit according to drive condition of the voltage rising circuit having the highest duty ratio of the plurality of voltage rising circuits. This configuration can provide a highly productive power supply apparatus capable of reducing a ripple voltage.

Abstract: An electronic device includes a central processing unit (CPU), a number of power supply units (PSUs), a north bridge, a south bridge, and a baseboard management controller (BMC). The number of power supply units (PSUs) supplies power to the CPU. Each PSU has a rated power. The north bridge is connected to the CPU. The south bridge is connected to the north bridge. The BMC is connected to the CPU by the north and south bridges. The BMC detects power supply states of each PSU and controls the north bridge to adjust a power consumption of the CPU according to the power supply states of the PSUs.

Abstract: A converter can include at least two power stages. Each power stage can include a power factor control circuit. An active shared control circuit for a three power stage system receives at least three sense signals. Each of the sense signals is associated with a parameter of the respective one of the power stages. The control circuit provides at least three control signals. Each of the control signals being associated with the respective power factor control circuit of the power stages. The active share control circuit balances the current supplied by the power stages via the control signals.

Abstract: Provided is a switching control method of a transformer coupled booster to suppress an increase in energizing current in a transformer of the transformer coupled booster and downsize the transformer coupled booster. A primary coil current that flows through a primary coil of the transformer, and a secondary coil current that flows through a secondary coil of the transformer are detected. The current difference between the detected primary coil current and the detected secondary coil current is calculated. Based on the calculated current difference, the cycle of ON/OFF periods of four arms provided on the transformer coupled booster is maintained at a constant level. Control is carried out so that the ratio of the first arm's ON period to the OFF period is always equal to the ratio of the third arm's ON period to the OFF period.

Abstract: Power supply devices are provided that can include power regulating circuitry for regulating (e.g., transforming or converting) electric power to be passed to an electronic device. A power supply device can also include control circuitry coupled with the regulating circuitry. The control circuitry can determine when the power supply device is coupled with an electronic device. The control circuitry can control the operation of the regulating circuitry based on whether or not the power supply device is coupled with the electronic device.

Abstract: A method for tracking power supplies includes the following steps: receiving, by a controller, a signal to be tracked and outputting, according to the signal to be tracked, a control signal. The control signal controls at least two sets of voltage level selection circuits in selecting at least one tracking voltage level from at least two groups of isolation voltage levels and controls each set of the voltage level selection circuits selecting at most one tracking voltage level from a group of isolation voltage levels. An isolation power supply provides the at least two groups of isolation voltage levels according to the voltage level interval of the signal to be tracked. Each group of isolation voltage levels includes at least two tracking voltage levels. The voltage level selection circuits provide the selected tracking voltage level to supply power to a load circuit. An apparatus for tracking power supplies is also provided.

Abstract: A single phase redundant power supply system may include a first power supply having an input coupled to a first phase voltage in a polyphase power distribution system and an output coupled to a load for supplying an amount of DC power to the load, and a second power supply having an input for coupling to a second phase voltage in the polyphase power distribution system and an output coupled to the load for supplying an amount of DC power to the load. At least the first power supply is configured to reduce phase current imbalances in the polyphase power distribution system by adjusting the amount of DC power supplied to the load by the first power supply and the amount of DC power supplied to the load by the second power supply.

Abstract: A power conversion system includes a first converter coupled to a power source, wherein the first converter includes an input side, and an output side electrically isolated from the input side. The power conversion system also includes a second converter coupled to the power source, wherein the second converter includes an input side, and an output side electrically isolated from the input side. The second converter input side is coupled in parallel with the first converter input side, and the second converter output side is coupled in series with the first converter output side. The power conversion system also includes an inverter coupled to the first converter output side and to the second converter output side, and the inverter supplies alternating current to an electrical distribution network.

Abstract: A power converter enhances conversion efficiency from DC power to AC power. A first chopper circuit chops DC voltage from a photovoltaic panel at a system frequency producing a first square-wave whose voltage level changes positively. A second chopper circuit chops the first square-wave at a frequency double the system frequency producing a second square-wave whose voltage level changes negatively and adds the first square-wave and the second square-wave to produce a third square-wave that changes positively and negatively in a sine-wave manner. A third chopper circuit charges and discharges by chopping the third square-wave at a third frequency fixed by timing according to a difference between the third square-wave and a sine-wave voltage. PWM control is performed on the charge and discharge outputs such that the difference is corrected, producing a sine-wave voltage that continuously changes positively and negatively. A spike noise of an output voltage is suppressed.

Abstract: An apparatus, device, and system for generating an amount of output power in response to a direct current (DC) power input includes a configurable power supply, which may be electrically coupled to the DC power input. The configurable power supply is selectively configurable between multiple circuit topologies to generate various DC power outputs and/or and AC power output. The system may also include one or more DC power electronic accessories, such as DC-to-DC power converters, and/or one or more AC power electronic accessories such as DC-to-AC power converters. The power electronic accessories are couplable to the configurable power supply to receive the corresponding DC or AC power output of the configurable power supply.

Abstract: A power supply device for providing an output voltage includes a first resonant converter, a second resonant converter, a first converting circuit, and a current regulating circuit. The first resonant converter is for converting a first input voltage into the output voltage. The second resonant converter is for converting a second input voltage into the output voltage. The output ends of the first and second resonant converters are coupled in parallel. The first converting circuit is coupled to the first resonant converter and is operable to provide the first input voltage to the first resonant converter. The current regulating circuit receives signals related to output currents of the first and second resonant converters, and drives operation of the first converting circuit according to the signals received thereby such that the output currents of the first and second resonant converters have substantially equal magnitudes.

Abstract: An apparatus, device, and system for generating an amount of output power in response to a direct current (DC) power input includes a configurable power supply, which may be electrically coupled to the DC power input. The configurable power supply is selectively configurable between multiple circuit topologies to generate various DC power outputs and/or and AC power output. The system may also include one or more DC power electronic accessories, such as DC-to-DC power converters, and/or one or more AC power electronic accessories such as DC-to-AC power converters. The power electronic accessories are couplable to the configurable power supply to receive the corresponding DC or AC power output of the configurable power supply.

Abstract: A power electronic converter for use in high voltage direct current power transmission and reactive power compensation comprises three converter limbs, each converter limb including first and second DC terminals for connection in use to a DC network and an AC terminal for connection in use to a respective phase of a three-phase AC network, each converter limb defining first and second limb portions being connected in series between the respective AC terminal and a respective one of the first and second DC terminals, each limb portion including at least one switching element being controllable in use to facilitate power conversion between the AC and DC networks, the power electronic converter further including a plurality of auxiliary units, each auxiliary unit being operably associated with the respective phase of the AC network, each auxiliary unit including at least one module including a voltage source, the limb portions being controllable in use to define at least one three-phase static synchronous compen

Abstract: A switching circuit for use in a power supply includes a first active switch coupled to a first terminal of a primary winding of a transformer. A second active switch is coupled to a second terminal of the primary winding of the transformer. An output capacitance of the first active switch is greater than an output capacitance of the second active switch. A first passive switch is coupled to the second active switch and to the second terminal of the primary winding. A second passive switch is coupled to the first active switch and to the first terminal of the primary winding. A reverse recovery time of the first passive switch is greater than a reverse recovery time of the second passive switch. A recovery circuit is coupled to receive a current from the first passive switch.

Abstract: A power conversion device according to an aspect of an embodiment includes a power conversion unit and a control unit. The power conversion unit includes N (N is an integer number not less than two) power converters that output voltages on the basis of base signals having the same period and phase differences equivalent to ½N of the period of the base signal. The control unit controls the N power converters by using ½ of the period of the base signal as a control period and shifts each of control timings of the N power converters by the ½N of the period of the base signal.

Abstract: A device comprises a first power cell, a second power cell, a power factor correction module, a boost inductor switch circuit, and an output. The first and second power cells are configured to provide first and second currents in response to an input voltage. The power factor correction module is configured to continuously activate and deactivate the first and second power cells based on an input current level, on the input voltage, and on an output voltage. The boost inductor switch circuit is configured to disable the first power cell in response to the input current level being below a predetermined level. The output is configured to provide the output voltage based on the first and second currents when the input current level is above the predetermined level, and to provide the output voltage based on the second current when the input current level is below the predetermined level.

Abstract: A power converter including a switching element, a switching power module containing a driving circuit for driving the switching element, a smoothing capacitor module for smoothing an input to the switching power module, and a heat sink for cooling the switching power module, wherein the switching power module is mounted on the heat sink, and the smoothing capacitor module is provided on a side surface of the heat sink.

Abstract: The invention relates to converters (inverters, pulse or frequency converters) and to driving “magnetically active” operating means. According to one embodiment, a circuit arrangement for feeding the operating means in at least one first winding phase (S1), comprises a first branch (Z1) of a frequency converter (WR1) adapted for and operable at a switching frequency of not higher than 5 kHz for outputting a main alternating current generated at said switching frequency and having a substantially lower operating frequency (f1) to a winding (L1). A second branch (z1) of another frequency converter (WR2) is adapted for and operable at a second switching frequency of more than 5 kHz for outputting a supplementary alternating current generated at said switching frequency to the same winding (L1). In the at least one winding (L1), the two alternating currents (iA(t); iB(t)) of the two branches (Z1, z1) are superimposed to form a sum current.

Abstract: A power supply includes a first power converter having a first transformer coupled to an input of the power supply and to a first output of the power supply. A clamp reset circuit is coupled to the first transformer. The clamp reset circuit includes a capacitor coupled to the first power converter and a Zener diode coupled to the capacitor. A second power converter is coupled to the clamp reset circuit. The second power converter includes a second transformer coupled to the clamp circuit and to a second output of the power supply. The capacitor is coupled to store energy received from the first power converter and the second power converter. The Zener diode is coupled to prevent the energy received from the first power converter and the second power converter from exceeding a threshold. The Zener diode limits voltage on the capacitor.

Abstract: An example power supply includes a first power converter, a second power converter, and a shared clamp reset circuit. The first power converter is adapted to convert an input to a first output and includes a first transformer having a first primary winding. The second power converter is also adapted to convert the input to a second output and includes a second transformer having a second primary winding. The second primary winding of the second transformer is not the first primary winding of the first transformer. The shared clamp reset circuit is coupled to the first primary winding of the first transformer and is coupled to the second primary winding of the second transformer to manage leakage inductance energy within the first transformer and within the second transformer.

Abstract: An arrangement for exchanging power, in shunt connection, with a three-phase electric power network includes a Voltage Source Converter having at least three phase legs with each a series connection of switching cells. Each switching cell has at least two semiconductor assemblies connected in series and having each a semiconductor device of turn-off- type and a rectifying element connected in anti-parallel therewith and at least one energy storing capacitor. A control unit is configured to control the semiconductor devices of each switching cell and to deliver a voltage across the terminals thereof being zero or U, in which U is the voltage across the capacitor. The control unit is also configured to calculate a value for amplitude and phase position for a second negative sequence-current or a zero-sequence voltage or a value of a dc current.

Abstract: A power system is disclosed. The power system comprises a plurality of power supply units, a voltage sharing bus, and a current sharing bus. The sharing bus is used to transmit a sharing voltage, and the current sharing bus is used to transmit a first current reference value. Each of the power supply units comprises: a power converter, a feed-forward control (FFC) circuit, and a feedback control (FBC) circuit. The feed-forward control circuit is used to generate a second current reference value according to a difference between an input voltage of the power converter and the sharing voltage. The feedback control circuit is used to generate a current compensation value according to the second current reference value and the first current reference value. The power converter can adjusts the output current thereof in accordance with the current compensation value.

Abstract: A method of controlling a multiphase power converter including a plurality of sub-converters coupled to provide power to a load is disclosed. Each sub-converter includes a power switch. The method includes selectively and consistently turning on the power switch of one or more of the sub-converters at substantially a same time as a reference signal representing a desired output of the power converter increases. The method further includes selectively and consistently turning off the power switch of one or more of the sub-converters at substantially a same time as the reference signal representing the desired output of the power converter decreases. Other methods, multiphase power converters and controllers for multiphase power converters are also disclosed.

Abstract: One embodiment of the invention provides a method for optimizing the power consumption in a redundant power system. A pulse width modulation waveform is generated in each of a first and second power supply to control the power output of each power supply. In response to the system load reaching a power setpoint, the first and second power supplies supply power to the system load in parallel. In response to the system load being below the power setpoint, the pulse width modulation waveform is disabled or blocked in the second power supply, and the system load is powered substantially entirely with the first power supply.

Abstract: Provided is a DC/DC converter including a power supply unit that includes a transformer having one primary side and a plurality of secondary sides and outputs a plurality of driving voltages for driving a load; and a constant current converting unit that is connected to one secondary side and a low-voltage stage of another secondary side adjacent to the one secondary side among the plurality of secondary sides of the transformer and boosts a driving voltage output from the one secondary side.

Abstract: A switched mode power supply allowing a half bridge converter to be use alone or in combination with another converter to form a full bridge converter. A common controller may be used for either half bridge or full bridge configurations. The modular approach simplifies design for a range of power supplies and reduces costs.

Abstract: We describe a photovoltaic power conditioning unit comprising: both dc and ac power inputs; a dc link; at least one dc-to-dc converter coupled between dc input and dc link; and a dc-to-ac converter coupled between dc link and ac output. The dc-to-dc converter comprises: a transformer having input and output windings; an input dc-to-ac converter coupled between dc input and input winding; and an ac-to-dc converter coupled between output winding the dc link. The output winding has a winding tap between the first and second portions. The ac-to-dc converter comprises: first and second rectifiers, each connected to a respective first and second portion of the output winding, to the dc link and winding tap; and a series inductor connected to the winding tap. Rectifiers are connected to the winding tap of the output winding via the series inductor wherein the series inductor is shared between the first and second rectifiers.

Abstract: An integrated-type high step-up ratio DC-AC conversion circuit with an auxiliary step-up circuit applies to converting a low DC voltage of alternative energy into a high AC voltage. The conversion circuit uses an isolated Cuk integration unit and an auxiliary step-up unit to form a multi-phase input and uses parallel charging and cascade discharging to boost the DC voltage in the DC side with a low voltage power switches and low duty cycle and then converts the boosted DC voltage into AC voltage. The auxiliary step-up unit not only shares the entirety of power but also exempts the DC-side circuit from using high voltage power switches, whereby the cost of elements is reduced. Further, the conversion circuit can decrease the switching loss and conduction loss of the DC-side switches and promote the efficiency of the circuit.

Abstract: A multiple-output switching power source apparatus has a series resonant circuit connected in parallel with a switch Q2 and including a primary winding and a current resonant capacitor, a first rectifying-smoothing circuit rectifying and smoothing a voltage of a secondary winding in an ON period of the switch to provide a voltage Vo1, a series resonant circuit connected in parallel with the switch and including a primary winding and a current resonant circuit, a second rectifying-smoothing circuit rectifying and smoothing a voltage of a secondary winding in the ON period of the switch Q2 to provide a voltage Vo2, and a control circuit controlling an ON period of a switch Q1 according to the output voltage Vo1 and the ON period of the switch Q2 according to the voltage Vo2 and limit the ON period of the switch Q1 if the voltage Vo2 exceeds a predetermined voltage.

Abstract: According to one aspect, embodiments of the invention provide power converter circuitry including an input including a plurality of input lines each configured to be coupled to a phase of a multiphase AC power source having a sinusoidal waveform, a plurality of DC buses including a first positive DC bus having a first nominal DC voltage, a second positive DC bus having a second nominal DC voltage, a first negative DC bus having a third nominal DC voltage and a second negative DC bus having a fourth nominal DC voltage; a first power converter coupled to the input and configured to supply power from the multiphase AC power source to the plurality of DC buses during a first positive region of the sinusoidal waveform and a first negative region of the sinusoidal waveform; and a second power converter coupled to the input and configured to supply power from the multiphase AC power source to at least some of the plurality of DC buses during a second positive region of the sinusoidal waveform and a second negative r

Abstract: In a unit inverter system where multiple unit inverters are connected in parallel, the quantity of operating unit inverters is determined in accordance with an amount of power to be converted. A gate signal of a semiconductor switching element of a unit inverter is turned off after an output current of the inverter is reduced when reducing the quantity of inverter units, thereby improving the partial load efficiency of the system without an adverse effect on the system. A regulator connected to the inverter determines dead time of the inverter according to the output current value and an average output current value of the unit inverters, waits for the determined dead time so as to reduce the output current of the unit inverter, and then turns off the gate signal.

Abstract: A power conversion system includes a power transformer for receiving AC power at a first voltage from an input side and for delivering AC power at a second voltage to an output side. A power converter is also included in the power conversion system wherein the power converter includes an input side converter on the input side and an output side converter on the output side coupled through a plurality of DC links. A converter controller in the power converter provides control signals to the input side converter and the output side converter for regulating an active power and a reactive power flow through the power converter. Each of the input side converters and the output side converters includes at least two power converter transformers coupled between respective power converter bridges coupled to the plurality of DC links and the input side or to the plurality of DC links and the output side.

Abstract: Disclosed herein is a method of controlling the current of a high-speed Switched Reluctance Motor (SRM) using an inverter circuit including a first switching element, a second switching element, a first diode, a second diode and a reactor, wherein the first switching element and the first diode, the second diode and the second switching element are connected to a bridge circuit, and one end of the reactor is connected to the junction of the first switching element and the first diode, and the remaining end of the reactor is connected to the junction of the second diode and the second switching element; and excitation mode, free-wheeling mode-1, the excitation mode, and free-wheeling mode-2 are sequentially performed in a unit period T, and, when the control is terminated, demagnetization is performed.

Abstract: The present invention relates to power converters of the type known generally as switch mode power converters (SMPCs). In particular, the present invention addresses the problem of reducing thermal stress across the phases of a multi phase converter. Specifically, a method of controlling a multi-phase switch mode power arrangement is provided. The multi-phase arrangement comprises a plurality of phases configured to deliver DC power to a common load. The method comprises the steps of: determining the thermal stress of each phase along with at least one other stress for each phase and controlling the share of DC power provided by the individual phases in an effort to equalize the thermal and other stress across the individual phases.

Abstract: An interleaved flyback converter device with leakage energy recycling includes: two flyback converters and an input power. Each flyback converter includes a capacitor, a switch, two diodes, and a transformer. The input power is connected to the capacitors of the two flyback converters respectively. By using the capacitors as input voltage, the two flyback converters are provided with lower voltage rating. The diodes are used to recycle leakage energy directly, and to clamp voltage on power components. Therefore, in addition to enhancing efficiency via recycling leakage energy, the two flyback converters have lower switching losses due to lower switching voltage.

Abstract: A multi-level parallel phase power converter has a power source, a converter, and an electrical node. The converter includes multiple converter modules. Each of the converter modules has multiple multi-level power converters, a poly-phase interphase inductor, and a set of poly-phase power summing connections. The summed power of each of the multiple converter modules are connected together to form a single poly-phase power converter.

Abstract: A method is provided for controlling a converter of the multiphase interleaving type. According to the method, there is detected when a change of a load applied to an output terminal of the converter occurs. When detected, all of the phases of the converter are simultaneously turned off by the generation of suitable PWM driving signals. The PWM driving signals are controlled so as to force the turn-on of the phases at the same time and to zero a time phase shift of driving of the interleaving type of the PWM driving signals. The interleaving of the driving time phase shift is recovered and a normal operation of the converter is restarted. A controller for controlling a converter of the multiphase interleaving type is also provided.

Abstract: A boost-forward-flyback convertor has a boost converting circuit, a forward converting circuit, a flyback converting circuit and a transformer. The boost converting circuit, the forward converting circuit and the flyback converting circuit are coupled by using elements of the boost and forward converting circuits to form the transformer. The boost-forward-flyback convertor combines benefits of conventional boost, forward and flyback convertors, specifically combines active clamping and lower power pressure to the element from the boost convertor, increases gain ratio by using the forward convertor and provides output to the load during a switch OFF-state from the combination of the flyback and boost converting circuit. The boost-forward-flyback convertor combines benefits of conventional boost, forward and flyback convertors and not only has very high gain, high converting efficiency and lower power loading for devices, but also is simple, cost less, easy to use and has a small volume.

Abstract: Systems and methods presented herein generally provide for the controlled voltage of bipolar electrical energy through the selected operation of power stages. In one embodiment, a system that provides electrical energy includes a power supply and at least two power stages coupled to the power supply. The power stages are operable to selectively output electrical energy. By selecting the number of power stages which are turned on at a given time the total voltage of the electrical energy is controlled at that time. The system may further include one or more controllers coupled to the power stages to control selection of the power stages and thereby vary the output voltage.

Abstract: The present invention relates to an electronic driver circuit and a corresponding method for supplying an electronic load (LED1, LED2, . . . , LEDn) with a DC current or voltage (Vload). To achieve a high efficiency and a low thermal stress on the electronic load, the proposed driver circuit comprises: —an AC input (L, N) for receiving an AC input voltage (Vmains), two buck-boost converters (10, 20) for alternately operating as rectifier for rectifying said AC input voltage (Vmains) and as DC/DC converter for DC conversion of said rectified AC input voltage, a control unit (11, 12, 13, 21, 22, 23; 40) for monitoring the zero crossing of the AC input voltage (Vmains) and for controlling said two buck-boost converters (10, 20) to change their modes of operation upon detection of a zero crossing, such that during all periods one buck-boost converter operates as rectifier and the other buck-boost converter operates as DC/DC converter.

Abstract: In a circuit apparatus for transformerless conversion of an electric direct voltage of a two-pole direct voltage source (1) connected to ground having a first voltage pole (+) and a second voltage pole (?) into an alternating voltage, hazardous capacitive leakage currents are avoided by connecting the direct voltage source (1) to ground and the DC-AC converter (400) is operated at a controlled intermediate circuit voltage, a DC-DC converter stage (300) being connected between the direct voltage source (1) and the DC-AC converter (400), said DC-DC converter stage providing at its output a +/? voltage that is symmetrical with respect to the grounding point, two series-connected capacitors (41, 42) having the same polarity and being connected to ground at their connecting point (V) and controlled are charged by two buck-boost choppers (100, 200) connected one behind the other.