US 12,703,257 B2Granted

Charging circuit of on-board charger, on-board charger, and charging control method

AssigneeHuawei Digital Power Technologies Co., Ltd.

InventorsShida Gu, Wei Zhang, Yang Cheng, Zhaoxue Cui

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Abstract

A charging circuit of an on-board charger, where a second end of a first power conversion circuit of the charging circuit is coupled to a first end of a second power conversion circuit, a high-voltage output end of the second power conversion circuit charges a power battery pack of an electric vehicle, and a first low-voltage output end of the second power conversion circuit supplies power to a low-voltage system of the electric vehicle. The first power conversion circuit is configured to, when the electric vehicle is in a charging mode, convert an alternating current input from a first end of the first power conversion circuit into a direct current and transmit the direct current to the first end of the second power conversion circuit.

Claims20

Dependent claims

A charging circuit of an on-board charger and comprising:

a second power conversion circuit comprising:
a second controllable switching transistor;
a first end;
a high-voltage output end configured to charge a power battery pack of an electric vehicle;
a first low-voltage output end configured to supply power to a low-voltage system of the electric vehicle;
a primary-side switching circuit comprising:
a second switching transistor;
a fourth end, wherein the fourth end is the first end;
and
a fifth end;
a first transformer comprising:
a first primary-side winding coupled to the fifth end;
a high-voltage secondary-side winding;
and
a low-voltage secondary-side winding;
a high-voltage secondary-side switching circuit comprising:
a first switching transistor;
a sixth end coupled to the high-voltage secondary-side winding;
and
a seventh end that is the high-voltage output end;
and
a low-voltage secondary-side switching circuit comprising:
a third switching transistor;
an eighth end coupled to the low-voltage secondary-side winding;
and
a ninth end that is the first low-voltage output end;
a first power conversion circuit comprising:
a first controllable switching transistor;
a second end coupled to the first end;
and
a third end,
wherein the first power conversion circuit is configured to:
when the electric vehicle is in a charging mode:
convert an alternating current input from the third end into a direct current;
and
transmit the direct current to the first end;
and
when the electric vehicle is in a driving mode:
perform direct current conversion on the direct current to obtain a converted current;
and
supply the converted current to the low-voltage system, and
wherein when the electric vehicle is in the driving mode, the second power conversion circuit is configured to:
convert a high voltage of the power battery pack into a low voltage;
transmit the low voltage to the first low-voltage output end;
and
output the direct current to the first power conversion circuit;
and
a controller coupled to the first power conversion circuit and the second power conversion circuit and configured to:
control operating states of each of the first controllable switching transistor and the second controllable switching transistor;
and
when the electric vehicle is in the driving mode:
control the first switching transistor to convert a first direct current from the power battery pack into a first alternating current;
transmit the first alternating current to the high-voltage secondary-side winding;
control the second switching transistor to convert a second alternating current from the first primary-side winding into a second direct current;
transmit the second direct current to the first power conversion circuit;
control the third switching transistor to convert a third alternating current from the low-voltage secondary-side winding into a third direct current;
and
transmit the third direct current to the first low-voltage output end.

55 more elements

An on-board charger comprising:

a first alternating current input;
a charging circuit comprising:
a second power conversion circuit comprising:
a second controllable switching transistor;
a first end;
a high-voltage output end configured to charge a power battery pack of an electric vehicle;
a first low-voltage output end configured to supply power to a low-voltage system of the electric vehicle;
a primary-side switching circuit comprising:
a second switching transistor;
a fourth end, wherein the fourth end is the first end;
and
a fifth end;
a first transformer comprising:
a first primary-side winding coupled to the fifth end;
a high-voltage secondary-side winding;
and
a low-voltage secondary-side winding;
a high-voltage secondary-side switching circuit comprising:
a first switching transistor;
a sixth end coupled to the high-voltage secondary-side winding;
and
a seventh end that is the high-voltage output end;
and
a low-voltage secondary-side switching circuit comprising:
a third switching transistor;
an eighth end coupled to the low-voltage secondary-side winding;
and
a ninth end that is the first low-voltage output end;
a first power conversion circuit comprising:
a first controllable switching transistor;
a second end coupled to the first end;
and
a third end,
wherein the first power conversion circuit is configured to:
when the electric vehicle is in a charging mode:
convert a second alternating current input from the third end into a direct current;
and
transmit the direct current to the first end;
and
when the electric vehicle is in a driving mode:
perform direct current conversion on the direct current to obtain a converted current;
and
supply the converted current to the low-voltage system,
wherein when the electric vehicle is in the driving mode, the second power conversion circuit is configured to:
convert a high voltage of the power battery pack into a low voltage;
transmit the low voltage to the first low-voltage output end;
and
output the direct current to the first power conversion circuit;
and
a controller coupled to the first power conversion circuit and the second power conversion circuit and configured to:
control operating states of each of the first controllable switching transistor and the second controllable switching transistor;
and
when the electric vehicle is in the driving mode:
control the first switching transistor to convert a first direct current from the power battery pack into a first alternating current;
transmit the first alternating current to the high-voltage secondary-side winding;
control the second switching transistor to convert a second alternating current from the first primary-side winding into a second direct current;
transmit the second direct current to the first power conversion circuit;
control the third switching transistor to convert a third alternating current from the low-voltage secondary-side winding into a third direct current;
and
transmit the third direct current to the first low-voltage output end;
and
an electromagnetic interference (EMI) filter circuit comprising:
an input end coupled to the first alternating current input;
and
an output end coupled to the third end,
wherein the EMI filter circuit is configured to filter out electromagnetic interference.

63 more elements

A control method for an on-board charger, wherein the control method is applied to a charging circuit of the on-board charger, and wherein the control method comprises:

when an electric vehicle is in a charging mode:
controlling a first power conversion circuit of the charging circuit to convert an alternating current input from a third end of the first power conversion circuit into a direct current and transmit the direct current to a first end of a second power conversion circuit of the charging circuit;
and
when the electric vehicle is in a driving mode:
controlling the second power conversion circuit to convert a high voltage of a power battery pack into a low voltage, transmit the low voltage to a first low-voltage output end of the second power conversion circuit, and output the direct current to the first power conversion circuit;
controlling the first power conversion circuit to perform direct current conversion on the direct current to obtain a converted current and supply the converted current to a low-voltage system of the electric vehicle;
controlling a first switching transistor of a high-voltage secondary-side winding of the second power conversion circuit to convert a first direct current from the power battery pack into a first alternating current;
transmitting the first alternating current to the high-voltage secondary-side winding;
controlling a second switching transistor of a primary-side switching circuit of the second power conversion circuit to convert a second alternating current from a first primary-side winding of a transformer of the second power conversion circuit into a second direct current;
transmitting the second direct current to the first power conversion circuit;
controlling a third switching transistor of a low-voltage secondary-side winding of the second power conversion circuit to convert a third alternating current from the low-voltage secondary-side winding into a third direct current;
and
transmitting the third direct current to the first low-voltage output end.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/987,290Filed 15 Nov 2022 · continuation
Priority: CN 202010413876.415 May 2020
Published: US 2023/0070930 A19 Mar 2023
Granted: 11 Aug 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification24 codes

B60L 53/22
Characterised by converters located in the vehicle: constructional details or arrangements of charging converters specially adapted for charging…
B60L 1/00
Supplying electric power to auxiliary equipment of vehicles
H02J 7/06
Regulation of charging current or voltage: using discharge tubes or semiconductor devices
H02M 1/009
Converters characterised by their input or output configuration: having two or more independently controlled outputs