Converter and on-board charger

Patent metadata

Field	Value
Publication number	US-12051966-B2
Application number	US-202217710676-A
Country	US
Kind code	B2
Filing date	Mar 31, 2022
Priority date	Mar 31, 2021
Publication date	Jul 30, 2024
Grant date	Jul 30, 2024

Abstract

A converter for avoiding a short-circuit fault of the converter while inhibiting a surge impact includes: a power factor correction (PFC) circuit, a surge protection circuit, and a switch circuit. The PFC circuit is configured to: convert a first component of a first alternating current received by an alternating current terminal of the PFC circuit into a first direct current, and output the first direct current through a direct current terminal of the PFC circuit; and convert a second direct current received by the direct current terminal of the PFC circuit into a second alternating current, and output the second alternating current through the alternating current terminal of the PFC circuit.

First claim

What is claimed is:

1. A converter, comprising:
a power factor correction (PFC) circuit comprising two direct current terminals and two or more alternating current terminals;
a surge protection circuit comprising three unidirectional converters or two bridge arms, wherein each of the three unidirectional converters or each of the two bridge arms comprises two diodes, wherein an anode of a first diode of each of the three unidirectional converters or each of the two bridge arms is connected to a respective alternating current terminal of the surge protection circuit, and wherein a cathode of a second diode of each of the three unidirectional converters or each of the two bridge arms is connected to a respective alternating current terminal of the surge protection circuit;
a switch circuit comprising a first unidirectional switch and a second unidirectional switch, wherein a first end of the first unidirectional switch is connected to a cathode of the first diode of each of the three unidirectional converters or each of the two bridge arms, wherein a first end of the second unidirectional switch is connected to an anode of the second diode of each of the three unidirectional converters or each of the two bridge arms, and wherein a second end of the first unidirectional switch and a second end of the second unidirectional switch are connected to the two direct current terminals of the PFC circuit; and
a controller configured to:
turn on both the first and second unidirectional switches to control the PFC circuit to perform AC/DC conversion by receiving alternating current from the two or more alternating current terminals of the PFC circuit and outputting direct current from the two direct current terminals of the PFC circuit; and
turn off both the first and second unidirectional switches to control the PFC circuit to perform DC/AC conversion by receiving direct current from the two direct current terminals of the PFC circuit and outputting alternating current from the two or more alternating current terminals of the PFC circuit.

2. The converter according to claim 1 , wherein the two or more alternating current terminals of the PFC circuit form a three-phase alternating current terminal, and the PFC circuit comprises a first bidirectional converter, a second bidirectional converter, and a third bidirectional converter;
wherein an alternating current terminal of the first bidirectional converter is a first alternating current terminal of the three-phase alternating current terminal, an alternating current terminal of the second bidirectional converter is a second alternating current terminal of the three-phase alternating current terminal, an alternating current terminal of the third bidirectional converter is a third alternating current terminal of the three-phase alternating current terminal, and the first alternating current terminal, the second alternating current terminal, and the third alternating current terminal constitute the three-phase alternating current terminal; and
wherein a direct current terminal of the first bidirectional converter, a direct current terminal of the second bidirectional converter, and a direct current terminal of the third bidirectional converter constitute direct current terminals of the PFC circuit, and the direct current terminals of the PFC circuit are connected to a first direct current bus.

3. The converter according to claim 2 , wherein the first bidirectional converter comprises:
a first inductor, wherein a first terminal of the first inductor is connected to the first alternating current terminal;
a first bidirectional switch, wherein the first bidirectional switch is connected between a second terminal of the first inductor and a positive terminal of the first direct current bus; and
a second bidirectional switch, wherein the second bidirectional switch is connected between the second terminal of the first inductor and a negative terminal of the first direct current bus;
wherein the second bidirectional converter comprises:
a second inductor, wherein a first terminal of the second inductor is connected to the second alternating current terminal;
a third bidirectional switch, wherein the third bidirectional switch is connected between a second terminal of the second inductor and the positive terminal of the first direct current bus; and
a fourth bidirectional switch, wherein the fourth bidirectional switch is connected between the second terminal of the second inductor and the negative terminal of the first direct current bus; and
wherein the third bidirectional converter comprises:
a third inductor, wherein a first terminal of the third inductor is connected to the third alternating current terminal;
a fifth bidirectional switch, wherein the fifth bidirectional switch is connected between a second terminal of the third inductor and the positive terminal of the first direct current bus; and
a sixth bidirectional switch, wherein the sixth bidirectional switch is connected between the second terminal of the third inductor and the negative terminal of the first direct current bus.

4. The converter according to claim 3 , wherein the PFC circuit further comprises:
a seventh bidirectional switch, wherein the seventh bidirectional switch is connected between the positive terminal of the first direct current bus and a first neutral line; and
an eighth bidirectional switch, wherein the eighth bidirectional switch is connected between the negative terminal of the first direct current bus and the first neutral line.

5. The converter according to claim 2 , wherein the surge protection circuit comprises the three unidirectional converters, wherein the three unidirectional converters comprise a first unidirectional converter, a second unidirectional converter, and a third unidirectional converter;
wherein an alternating current terminal of the first unidirectional converter is connected to the first alternating current terminal of the PFC circuit, an alternating current terminal of the second unidirectional converter is connected to the second alternating current terminal of the PFC circuit, and an alternating current terminal of the third unidirectional converter is connected to the third alternating current terminal of the PFC circuit; and
wherein the alternating current terminal of the first unidirectional converter, the alternating current terminal of the second unidirectional converter, and the alternating current terminal of the third unidirectional converter constitute alternating current terminals of the surge protection circuit, and a direct current terminal of the first unidirectional converter, a direct current terminal of the second unidirectional converter, and a direct current terminal of the third unidirectional converter constitute direct current terminals of the surge protection circuit.

6. The converter according to claim 5 , wherein the first diode of the first unidirectional converter is connected between the first alternating current terminal of the surge protection circuit and the first end of the first unidirectional switch;
wherein the second diode of the first unidirectional converter is connected between the first alternating current terminal of the surge protection circuit and the second end of the second unidirectional switch;
wherein the first diode of the second unidirectional converter is connected between the second alternating current terminal of the surge protection circuit and the first end of the first unidirectional switch; and
wherein the second diode of the second unidirectional converter is connected between the second alternating current terminal of the surge protection circuit and the second end of the second unidirectional switch; and
wherein the first diode of the third unidirectional converter is connect

Assignees

• Huawei Digital Power Tech Co Ltd

Inventors

• Chen Chen
• Ma Bin
• Liu Weiping
• Cui Zhaoxue

Classifications

• H02H9/047

  Free-wheeling circuits · CPC title

• H02M7/797

  using semiconductor devices only · CPC title

• H02M7/125

  Avoiding or suppressing excessive transient voltages or currents · CPC title

• B60L53/22

  Constructional details or arrangements of charging converters specially adapted for charging electric vehicles · CPC title

• B60L3/0046

  relating to electric energy storage systems, e.g. batteries or capacitors · CPC title