A power supply system is disclosed. The power supply module comprises a three-phase voltage source, for generating a power source with three phases; a plurality of power supply modules, coupled to the three-phase voltage source, each comprising a plurality of major transforming modules corresponding to the three-phase voltage source for generating a plurality of direct-current voltages according to the three-phase voltage source; and at least a backup supply module, coupled to the plurality of power supply modules, each comprising a plurality of backup transforming modules corresponding to the three-phase voltage source, for generating the plurality of direct-current voltages corresponding to the three-phase voltage source by a backup transforming module corresponding to at least one of the plurality of major transforming modules of the plurality of power supply modules when the at least one of the plurality of major transforming modules is in an abnormal operation.

A switching control circuit including: a command value output circuit that respectively outputs a command value indicating a first time period, and command values indicating second and third time periods, in first and second load states; a first driver circuit that, in the first load state, turns on a first transistor after a first inductor current reaches a first value, and subsequently turns off the first transistor when the first time period has elapsed; and a second driver circuit that, in the second load state, turns on a second transistor when a second inductor current reaches a second value, and subsequently turns off the second transistor when the third time period has elapsed. The first driver circuit, in the second load state, turns on the first transistor when the first inductor current reaches the first value, and subsequently turns off the first transistor when the second time period has elapsed.

A switching control circuit including: a command value output circuit that respectively outputs a command value indicating a first time period, and command values indicating second and third time periods, in first and second load states; a first driver circuit that, in the first load state, turns on a first transistor after a first inductor current reaches a first value, and subsequently turns off the first transistor when the first time period has elapsed; and a second driver circuit that, in the second load state, turns on a second transistor when a second inductor current reaches a second value, and subsequently turns off the second transistor when the third time period has elapsed. The first driver circuit, in the second load state, turns on the first transistor when the first inductor current reaches the first value, and subsequently turns off the first transistor when the second time period has elapsed.

An AC to DC conversion system is described. The conversion system consists of an electronic switch and control circuitry employed to provide controlled pulsed power to a storage device that provides power to a load at either a preselected or manually or automatic selectable voltages while ensuring the voltage drop across the switch is minimized to reduce power dissipated through the switch itself, thereby significantly increasing the efficiency and reducing thermal losses. The AC to DC converter in one minimal version consists of a pair of N-MOSFET transistors, a voltage divider, a storage element and a pair of diodes. The design enables high efficiency with minimal components that may be fully integrated onto silicon.

A method for power conversion includes coupling a first string to a second string via a first connecting node and a second connecting node to form at least one leg of a power converter. The first string is operatively coupled across a first bus and a second bus and comprises a first branch and a second branch coupled via a third connecting node. The first branch and the second branch include a plurality of controllable semiconductor switches. Furthermore, the second string comprises a first chain link and a second chain link coupled via an alternating current phase bus and includes a plurality of switching units. The first chain link and/or the second chain link are controlled to generate a negative voltage across at least one of the plurality of controllable semiconductor switches during a switch turn off process.

A secondary controller drives a light emitting element of a photocoupler such that a detection voltage V.sub.OUTS corresponding to an output voltage V.sub.OUT generated in an output capacitor C approximates to a reference voltage V.sub.REF. A primary controller controls a switching transistor M according to a feedback signal V.sub.FB. A protection circuit is activated and drives the light emitting element of the photocoupler when detecting an abnormal state. An auxiliary power supply circuit includes a power supply capacitor C provided separately from the output capacitor C and supplies a power supply voltage V.sub.CC to the protection circuit and an anode of the light emitting element of the photocoupler.

A secondary controller drives a light emitting element of a photocoupler such that a detection voltage V.sub.OUTS corresponding to an output voltage V.sub.OUT generated in an output capacitor C approximates to a reference voltage V.sub.REF. A primary controller controls a switching transistor M according to a feedback signal V.sub.FB. A protection circuit is activated and drives the light emitting element of the photocoupler when detecting an abnormal state. An auxiliary power supply circuit includes a power supply capacitor C provided separately from the output capacitor C and supplies a power supply voltage V.sub.CC to the protection circuit and an anode of the light emitting element of the photocoupler.

There is provided an AC-DC converter circuit (100) for high power charging of an electrical battery. The circuit comprises an input rectifier comprising a first node and a second node. The input rectifier (110) is configured to receive an AC voltage at the first node (112) and provide a rectified voltage at the second node (114). The circuit further comprises a first transistor (120), comprising a first gate node (122), a first source node (124), and a first drain node (126). The first drain node is connected to the second node of the input rectifier. The first gate node is connected to a ground node (170). The circuit further comprises a second transistor (130), comprising a second gate node (132), a second source node (134), and a second drain node (136). The second drain node is connected to the first source node. The second transistor materially corresponds to the first transistor. The circuit further comprises a duty cycle control unit (140) connected to the second gate node for providing the second transistor with a switching waveform. The circuit further comprises an output rectifier (150) connected to the second source node or the first source node. The circuit further comprises an output electronic filter (160) connected to the second source node or an output node (151) of the output rectifier. An AC-DC converter device, a method for charging an electrical battery, and a regenerative braking system is also provided.

There is provided an AC-DC converter circuit (100) for high power charging of an electrical battery. The circuit comprises an input rectifier comprising a first node and a second node. The input rectifier (110) is configured to receive an AC voltage at the first node (112) and provide a rectified voltage at the second node (114). The circuit further comprises a first transistor (120), comprising a first gate node (122), a first source node (124), and a first drain node (126). The first drain node is connected to the second node of the input rectifier. The first gate node is connected to a ground node (170). The circuit further comprises a second transistor (130), comprising a second gate node (132), a second source node (134), and a second drain node (136). The second drain node is connected to the first source node. The second transistor materially corresponds to the first transistor. The circuit further comprises a duty cycle control unit (140) connected to the second gate node for providing the second transistor with a switching waveform. The circuit further comprises an output rectifier (150) connected to the second source node or the first source node. The circuit further comprises an output electronic filter (160) connected to the second source node or an output node (151) of the output rectifier. An AC-DC converter device, a method for charging an electrical battery, and a regenerative braking system is also provided.

The present disclosure discloses a power conversion apparatus and a method for configuring the same. The power conversion apparatus includes a boost unit and at least two power conversion units; each of the power conversion units has two input ends; an input end of the boost unit is connected with one end of an alternating-current power supply, and an output end of the boost unit is connected with one input end of a first power conversion unit of the plurality of power conversion units; one input end of a last power conversion unit of the plurality of power conversion units is connected with the other end of the alternating-current power supply; and the input ends of the plurality of power conversion units are connected in series, and the output ends of the plurality of power conversion units are connected in parallel.