Power module and charging device

Patent metadata

Field	Value
Publication number	US-2026088712-A1
Application number	US-202519408502-A
Country	US
Kind code	A1
Filing date	Dec 4, 2025
Priority date	Jun 5, 2023
Publication date	Mar 26, 2026
Grant date	—

Abstract

A power module includes N groups of interleaved parallel PFC circuits and a controller. Each group of the interleaved parallel PFC circuits includes a PFC inductor, an autotransformer, a first rectifier bridge arm, and a second rectifier bridge arm. The autotransformer includes a first winding and a second winding that are coupled to each other. The controller is configured to: in response to that an absolute value of a difference between a current of the first winding and a current of the second winding is greater than or equal to a preset value, adjust a duty cycle of a drive signal of a switching transistor of the first rectifier bridge arm or the second rectifier bridge arm in a next switching cycle.

First claim

1 . An AC-DC power module, comprising:
a controller; and N groups of interleaved parallel power factor correction (PFC) circuits, wherein each group of the interleaved parallel PFC circuits is configured to convert an alternating current of one phase of an alternating current power supply into a direct current and output the direct current to a direct current bus, wherein 1≤N≤3, and N is an integer; each group of the interleaved parallel PFC circuits comprises a PFC inductor, an autotransformer, a first rectifier bridge arm, and a second rectifier bridge arm, the autotransformer comprises a first winding and a second winding, one end of the PFC inductor is configured to receive the alternating current, the other end of the PFC inductor is configured to connect to one end of the first winding and one end of the second winding, the other end of the first winding is configured to connect to the first rectifier bridge arm, and the other end of the second winding is configured to connect to the second rectifier bridge arm; and the controller is configured to:
in response to an absolute value of a difference between a current of the first winding and a current of the second winding being greater than or equal to a preset value and that an absolute value of the current of the first winding being greater than an absolute value of the current of the second winding, reduce a duty cycle of a drive signal, in a next switching cycle, of a switching transistor that is in the first rectifier bridge arm and whose operating frequency is greater than a frequency of the alternating current; or
in response to an absolute value of a difference between a current of the first winding and a current of the second winding being greater than or equal to a preset value and that an absolute value of the current of the second winding being greater than an absolute value of the current of the first winding, reduce a duty cycle of a drive signal, in a next switching cycle, of a switching transistor that is in the second rectifier bridge arm and whose operating frequency is greater than a frequency of the alternating current.

2 . The power module according to claim 1 , wherein the N groups of interleaved parallel PFC circuits comprise bus capacitors, the bus capacitors comprise a positive bus capacitor and a negative bus capacitor that are connected in series, one end of the positive bus capacitor is connected to a positive direct current bus, and the other end of the negative bus capacitor is connected to a negative direct current bus.

3 . The power module according to claim 2 , wherein the first rectifier bridge arm comprises a first diode, a second diode, a third diode, a fourth diode, a first switching transistor, and a second switching transistor, wherein the first diode, the second diode, the third diode, and the fourth diode are connected in series, a cathode of the first diode is connected to the positive direct current bus, an anode of the fourth diode is connected to the negative direct current bus, one end of the first switching transistor is connected to a midpoint between the first diode and the second diode that are connected in series, the other end of the first switching transistor is connected to a midpoint between the bus capacitors, one end of the second switching transistor is connected to a midpoint between the third diode and the fourth diode that are connected in series, and the other end of the second switching transistor is connected to the midpoint between the bus capacitors; and
the second rectifier bridge arm comprises a fifth diode, a sixth diode, a seventh diode, an eighth diode, a third switching transistor, and a fourth switching transistor, wherein the fifth diode, the sixth diode, the seventh diode, and the eighth diode are connected in series, a cathode of the fifth diode is connected to the positive direct current bus, an anode of the eighth diode is connected to the negative direct current bus, one end of the third switching transistor is connected to a midpoint between the fifth diode and the sixth diode that are connected in series, the other end of the third switching transistor is connected to the midpoint between the bus capacitors, one end of the fourth switching transistor is connected to a midpoint between the seventh diode and the eighth diode that are connected in series, and the other end of the fourth switching transistor is connected to the midpoint between the bus capacitors.

4 . The power module according to claim 3 , wherein the controller is further configured to:
in response to phase voltage of the alternating current being in a positive half cycle, the absolute value of the difference between the current of the first winding and the current of the second winding being greater than or equal to the preset value, and the absolute value of the current of the first winding being greater than the absolute value of the current of the second winding, reduce a duty cycle of a drive signal of the first switching transistor in the next switching cycle.

5 . The power module according to claim 3 , wherein the controller is further configured to:
in response to phase voltage of the alternating current being in a positive half cycle, the absolute value of the difference between the current of the first winding and the current of the second winding being greater than or equal to the preset value, and the absolute value of the current of the first winding being less than the absolute value of the current of the second winding, reduce a duty cycle of a drive signal of the third switching transistor in the next switching cycle.

6 . The power module according to claim 3 , wherein the controller is further configured to:
in response to phase voltage of the alternating current being in a negative half cycle, the absolute value of the difference between the current of the first winding and the current of the second winding being greater than or equal to the preset value, and the absolute value of the current of the first winding being greater than the absolute value of the current of the second winding, reduce a duty cycle of a drive signal of the second switching transistor in the next switching cycle.

7 . The power module according to claim 3 , wherein the controller is further configured to:
in response to phase voltage of the alternating current being in a negative half cycle, the absolute value of the difference between the current of the first winding and the current of the second winding being greater than or equal to the preset value, and the absolute value of the current of the first winding being less than the absolute value of the current of the second winding, reduce a duty cycle of a drive signal of the fourth switching transistor in the next switching cycle.

8 . The power module according to claim 1 , wherein the first rectifier bridge arm comprises a first switching transistor and a second switching transistor that are connected in series, one end of the first switching transistor is configured to connect to a positive direct current bus, and one end of the second switching transistor is configured to connect to a negative direct current bus;
the second rectifier bridge arm comprises a third switching transistor and a fourth switching transistor that are connected in series, one end of the third switching transistor is configured to connect to the positive direct current bus, and one end of the fourth switching transistor is configured to connect to the negative direct current bus; and the other end of the first winding is configured to connect to a midpoint between the first switching transistor and the second switching transistor that are connected in series, and the other end of the second winding is configured to connect to a midpoint bet

Assignees

• Huawei Digital Power Tech Co Ltd

Inventors

• Yang Jin
• Lv Zejie
• Liu Yaping
• He Xinliang

Classifications

• H02M1/4266

  using passive elements · CPC title

• H02M1/084

  using a control circuit common to several phases of a multi-phase system · CPC title

• B60L2210/30

  AC to DC converters · CPC title

• H02M1/0009

  Devices or circuits for detecting current in a converter · CPC title

• B60L53/11

  DC charging controlled by the charging station, e.g. mode 4 · CPC title