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 provides a control device for a power factor correction circuit. The power factor correction circuit is disposed in a power supply device configured to generate a direct current output voltage from an alternating current voltage applied to a pair of power supply terminals. The power factor correction circuit is disposed between a full-wave rectifier circuit configured to generate a full-wave rectified voltage by full-wave rectifying the AC voltage and an output wiring configured to apply the output voltage. The power factor correction circuit includes an inductor inserted between the full-wave rectifier circuit and the output wiring, and a switching element configured to switch between an on state and an off state to control a current flowing through the inductor.

The present disclosure provides a control device for a power factor correction circuit. The power factor correction circuit is disposed in a power supply device configured to generate a direct current output voltage from an alternating current voltage applied to a pair of power supply terminals. The power factor correction circuit is disposed between a full-wave rectifier circuit configured to generate a full-wave rectified voltage by full-wave rectifying the AC voltage and an output wiring configured to apply the output voltage. The power factor correction circuit includes an inductor inserted between the full-wave rectifier circuit and the output wiring, and a switching element configured to switch between an on state and an off state to control a current flowing through the inductor.

An apparatus includes an energy storage system electrically connected across a bus. the energy storage system comprising: a first energy storage element. and a second energy storage element electrically connected to the first energy storage element at an energy node that is between the first energy storage element and the second energy storage element: and an energy filter system electrically connected to the energy node. The energy filter system is configured to electrically connect to one phase of a multi-phase alternating current (AC) power system.

Critical-mode soft-switching techniques for a power converter are described. In one example, a power converter includes a converter electrically coupled between an alternating current (AC) power system and a direct current (DC) power system, where the converter includes a number of phase legs. The power converter can also include a control system configured, during a portion of a whole line cycle of the AC power system, to clamp a first phase leg of the converter from switching and operate second and third phase legs of the converter independently in either critical conduction mode (CRM) or in discontinuous conduction mode (DCM).

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.

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.

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.