A permanent magnet synchronous generator control system includes a charging circuit connected between a vehicle generator winding and a battery, a controller connected with the charging circuit, and a current detection circuit for detecting a magnitude of charging current and a voltage feedback circuit for detecting a magnitude of charging voltage that are connected with the controller. The charging circuit includes a chopper circuit for chopping an AC voltage output by the vehicle generator winding and a rectifier circuit for rectifying the chopped AC voltage into a DC voltage for charging the battery. The controller is configured to control the charging circuit to adjust the magnitude of charging current or voltage based on the detection result from the current detection circuit or voltage feedback circuit, so as to maintain the stability of the charging voltage for the battery and obtain a constant power output.

The present invention relates to a power supply circuit (400) for a breaking circuit (100), the power supply circuit (400) comprising a first connecting point (CP1) arranged to be connected to an input (102) of the breaking circuit (100) and a second connecting point (CP2) arranged to be connected to an output (104) of the breaking circuit (100). The power supply circuit (400) further comprises a first rectifier (416) and a second rectifier (418) connected in series and in opposite direction to each other between the first connecting point (CP1) and the second connecting point (CP2); a first switch (412) and a second switch (414) connected in series between the first connecting point (CP1) and the second connecting point (CP2), wherein the first switch (412) and the second switch (414) are connected in parallel to the first rectifier (416) and the second rectifier (418); and a first capacitor (C1) having a first connecting point (CP1.sub.C1) connected between the first rectifier (416) and the second rectifier (418) and a second connecting point (CP2.sub.C1) connected between the first switch (412) and the second switch (414), wherein the first connecting point (CP1.sub.C1) of the first capacitor (C1) is further arranged to be connected to a power consumer (110a, 110b, . . . , 110n) of the breaking circuit (100). The power supply circuit (400) is arranged to at least one of: open the first switch (412) so that a current running from the input (102) to the output (104) passes via the first rectifier (416), the first capacitor (C1) and the second switch (414) thereby charging the first capacitor (C1); and open the second switch (414) so that a current running from the output (104) to the input (102) passes via the second rectifier (418), the first capacitor (C1) and the first switch (412) thereby charging the first capacitor (C1).

A method of short-circuiting a faulty submodule for a voltage-source power converter is disclosed. The submodule is based on a full-bridge, asymmetric full-bridge or half-bridge circuit design having power semiconductor switches with anti-parallel freewheeling diodes and optionally non-controllable semiconductor valves. The method 36 includes identifying a faulty semiconductor device and determining a failure mode selected from a short-circuit failure mode and an open circuit failure mode. The method further includes selecting a minimum number of power semiconductor switches suitable to provide a bypass path through the submodule depending on the identified faulty semiconductor device and the determined failure mode and driving the selected power semiconductor switches by a modified driving voltage compared to normal operation to cause them to break down in order to provide a durable, stable, low impedance short-circuit path between the AC voltage terminals of the submodule. A power converter comprising a series connection of such submodules and supporting the method of short-circuiting a faulty submodule is also disclosed.

A three-phase power supply circuit is provided. The power supply circuit includes three LLC resonant voltage convertors, three step-down transformers, and a bridge rectifier. Each step-down transformer includes a primary and secondary coil, and each primary and secondary coil has a first node and a second node. Each step-down transformer is electrically coupled with one of the three LLC resonant voltage convertors by the first and second nodes of the primary coils. The bridge rectifier is electrically coupled with the first node of the secondary coil of each of the three step-down transformers. The second nodes of the secondary coils of each of the three step-down transformers are electrically coupled together.

A rectifying element includes a MOS transistor series-connected with a Schottky diode. A bias voltage is applied between the control terminal of the MOS transistor and the terminal of the Schottky diode opposite to the transistor. A pair of the rectifying elements are substituted for diodes of a rectifying bridge circuit. Alternatively, the control terminal bias is supplied from a cross-coupling against the Schottky diodes. In another implementation, the Schottky diodes are omitted and the bias voltage applied to control terminals of the MOS transistors is switched in response to cross-coupled divided source-drain voltages of the MOS transistors. The circuits form components of a power converter.

An image display apparatus is disclosed. The image display apparatus includes a display and a power supply configured to supply driving voltage to the display, wherein the power supply includes a converter to convert input AC voltage into DC voltage and a controller to control the converter, the converter includes a first leg including a first switching device and a second switching device connected to each other in series and a second leg including a first diode and a second diode connected to each other in series, the first diode and the second diode connected to the first leg in parallel, and the controller controls on time of the first switching device to gradually increase from a first level to a second level for a first period for which the input AC voltage rises after a zero crossing point.

A battery charger capable of receiving AC power and delivering both AC and DC power to an electric power storage battery in accordance to different embodiments disclosed herein using a rectifier circuit supplying the DC load and absorbing power as a five-level active rectifier with low harmonics on the AC input. In one aspect, the battery charger may have a bidirectional rectifier/inverter converter providing power conversion between a DC source and AC enabling the user to not only charge an electrical vehicle (“EV”) but also convert the energy charged in the EV/battery or solar panel to AC for use.

Power-electronic systems and components thereof such as electrical-energy storage apparatuses/subsystems in the form of supercapacitors and power-electronic apparatuses/subsystems are disclosed. A supercapacitor has a conductive or semi-conductive first metasurface layer, a conductive or semi-conductive second metasurface layer, and a dielectric layer sandwiched between the first and the second metasurface layers for electrically insulating the first metasurface layer from the second metasurface layer. An electrical power conversion apparatus has a first power conversion circuitry for converting a first portion of electrical power received from an electrical power source and outputting the converted electrical power via an output. The electrical power conversion apparatus also has one or more direct power transfer (DPT) channels electrically coupling to the first power conversion circuitry in parallel for bypassing the first power conversion circuitry and directing transferring a second portion of the electrical power received from the electrical power source to the output.

A circuit includes a capacitor-drop power supply including a series combination of a resistor and a first capacitor. The capacitor-drop power supply includes an output and is adapted to be coupled to a light source. The circuit also includes a second capacitor, a switch, and an active clamp circuit. The second capacitor couples to the output of the capacitor-drop power supply. The switch couples in parallel with the series combination of the resistor and the first capacitor. The switch is configured to cause the light source to illuminate. The active clamp circuit couples to the capacitor-drop power supply. The active clamp circuit has an output coupled to the capacitor-drop power supply. The active clamp circuit is configured to cause current to continuously flow through at least one of the switch or the series combination of resistor and first capacitor regardless of a magnitude of the voltage across the second capacitor.

The present disclosure relates to a power converter device including a power factor correction circuit, a resonance converter circuit, and a zero voltage switching circuit. The power factor correction circuit is coupled to the primary side rectifier circuit, and includes a first switching circuit, a first control circuit and a first output circuit. The resonance converter circuit includes a second switching circuit and a second control circuit. The second switching circuit is coupled to the first output circuit, and the second control circuit is coupled to the secondary side rectifier circuit. The zero voltage switching circuit is coupled between the first control circuit and the second control circuit. The zero voltage switching circuit is configured to obtain a switching voltage of a switch element in the second switching circuit, and output an adjustment signal to the first control circuit according to the switching voltage.