Bidirectional DC/DC converter, control method thereof, and vehicle

Patent metadata

Field	Value
Publication number	US-12470149-B2
Application number	US-202318361151-A
Country	US
Kind code	B2
Filing date	Jul 28, 2023
Priority date	Jan 29, 2021
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

A bidirectional DC/DC converter includes a first terminal circuit, a transformer, a second terminal circuit, and a reset circuit, and the transformer includes a first winding and a second winding. The first terminal circuit is coupled to the first winding, and the second terminal circuit and the reset circuit are coupled to the second winding. In a first time period in which the bidirectional DC/DC converter is in a second working state, the second terminal circuit transmits a second alternating current to the first terminal circuit by using the second winding and the first winding; and in a second time period in which the bidirectional DC/DC converter is in the second working state, the reset circuit is in a conducted state, to reset the second winding.

First claim

What is claimed is:

1 . A bidirectional DC/DC converter, comprising:
a first terminal circuit; a transformer comprising a first winding and a second winding, wherein the first terminal circuit is coupled to the first winding; a second terminal circuit; and a reset circuit, wherein the second terminal circuit and the reset circuit are coupled to the second winding; wherein when the bidirectional DC/DC converter is in a first working state, the first terminal circuit is configured to transmit a first alternating current to the second terminal circuit through the first winding and the second winding, the second terminal circuit is configured to convert the first alternating current into a first direct current, and the reset circuit is in a broken state; wherein in a first time period in which the bidirectional DC/DC converter is in a second working state, the second terminal circuit is configured to transmit a second alternating current to the first terminal circuit through the second winding and the first winding, and the first terminal circuit is configured to convert the second alternating current into a second direct current; and wherein in a second time period in which the bidirectional DC/DC converter is in the second working state, the reset circuit is in a conducted state, the reset circuit is configured to reset the second winding, and the second terminal circuit is configured to stop transmitting the second alternating current to the first terminal circuit.

2 . The bidirectional DC/DC converter according to claim 1 , wherein:
the second winding has a central tap, and the central tap is configured to divide the second winding into a first sub-winding and a second sub-winding; and the second terminal circuit is separately coupled to a dotted terminal of the first sub-winding, the central tap, and an undotted terminal of the second sub-winding; and the reset circuit is coupled between the dotted terminal of the first sub-winding and a reference ground or the reset circuit is coupled between the undotted terminal of the second sub-winding and the reference ground.

3 . The bidirectional DC/DC converter according to claim 1 , wherein:
the second winding has a central tap, and the central tap is configured to divide the second winding into a first sub-winding and a second sub-winding; the second terminal circuit is separately coupled to a dotted terminal of the first sub-winding, the central tap, and an undotted terminal of the second sub-winding; and the reset circuit is coupled between the central tap and the dotted terminal of the first sub-winding or is coupled between the central tap and the undotted terminal of the second sub-winding.

4 . The bidirectional DC/DC converter according to claim 1 , wherein the reset circuit comprises a first capacitor and a first switch connected in series to the first capacitor, and the first switch is configured to control the first capacitor to reset the second winding.

5 . The bidirectional DC/DC converter according to claim 4 , wherein:
a corresponding working period in which the bidirectional DC/DC converter is in the second working state comprises the first time period, the second time period, a third time period, and a fourth time period; the first switch is configured to: control, in the second time period, a first sub-winding of the second winding to form a first reset loop with the first capacitor, reset the first capacitor in a short-circuit manner in the first time period, and break the first reset loop in the third time period and the fourth time period; and the reset circuit further comprises a second switch, and the second switch is configured to: control, in the fourth time period, a second sub-winding of the second winding to form a second reset loop with the first capacitor, break the second reset loop in the first time period and the second time period, and reset the first capacitor in a short-circuit manner in the third time period.

6 . The bidirectional DC/DC converter according to claim 4 , wherein:
a corresponding working period in which the bidirectional DC/DC converter is in the second working state comprises the first time period, the second time period, a third time period, and a fourth time period; the reset circuit further comprises a third switch and a fourth switch; the third switch is coupled to a dotted terminal of a first sub-winding of the second winding, the fourth switch is coupled to an undotted terminal of a second sub-winding of the second winding, and the third switch and the fourth switch are connected in parallel to each other and are connected in series to the first switch and the first capacitor; the third switch and the first switch are configured to control, in the second time period, the first sub-winding to form a third reset loop with the first capacitor; the fourth switch and the first switch are configured to control, in the fourth time period, the second sub-winding to form a fourth reset loop with the first capacitor; and the first switch is further configured to: break the third reset loop in the first time period, and break the fourth reset loop in the third time period.

7 . A bidirectional DC/DC converter control method, comprising:
in a first time period in which the bidirectional DC/DC converter is in a second working state, controlling a second terminal circuit to transmit a second alternating current to a first terminal circuit through a second winding and a first winding, and controlling the first terminal circuit to convert the second alternating current into a second direct current, wherein the bidirectional DC/DC converter comprises the first terminal circuit, a transformer, the second terminal circuit, and a reset circuit, the transformer comprises the first winding and the second winding, the first terminal circuit is coupled to the first winding, and the second terminal circuit and the reset circuit are coupled to the second winding; in a second time period in which the bidirectional DC/DC converter is in the second working state, controlling the second terminal circuit to stop transmitting the second alternating current to the first terminal circuit, and controlling the reset circuit to be conducted, so as to reset the second winding; and when the bidirectional DC/DC converter is in a first working state, controlling the first terminal circuit to transmit a first alternating current to the second terminal circuit through the first winding and the second winding, controlling the second terminal circuit to convert the first alternating current into a first direct current, and controlling the reset circuit to be broken.

8 . The control method according to claim 7 , wherein the reset circuit comprises a first capacitor and a first switch connected in series to the first capacitor, and controlling the reset circuit to be conducted, so as to reset the second winding comprises:
controlling the first switch to be turned on, to enable the first capacitor to reset the second winding.

9 . The control method according to claim 8 , wherein:
a corresponding working period in which the bidirectional DC/DC converter is in the second working state comprises the first time period, the second time period, a third time period, and a fourth time period; the reset circuit further comprises a second switch, the first switch is coupled to a dotted terminal of a first sub-winding, the second switch is coupled to an undotted terminal of a second sub-winding, and the first switch and the second switch are connected in parallel to each other and are connected in series to the first capacitor; and controlling the first switch to be turned on, to enable the first capacitor to reset the second winding comprises:
con

Assignees

• Huawei Digital Power Tech Co Ltd

Inventors

• Li Yanfeng
• Ma Yu
• Zhou Yongsheng

Classifications

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/06

  using discharge tubes or semiconductor devices · CPC title

• B60L2210/10

  DC to DC converters · CPC title

• H02M3/33573

  Full-bridge at primary side of an isolation transformer · CPC title

• H02J2207/20

  Charging or discharging characterised by the power electronics converter · CPC title