CN-224233354-U - Pre-charging system and vehicle

CN224233354UCN 224233354 UCN224233354 UCN 224233354UCN-224233354-U

Abstract

The embodiment of the application provides a pre-charging system and a vehicle, wherein the pre-charging system comprises a high-voltage battery, a high-voltage direct current connector, a flyback circuit, a low-voltage direct current connector, a first capacitor and a low-voltage battery, wherein the positive electrode of the high-voltage battery is connected with the first end of the high-voltage direct current connector, the negative electrode of the high-voltage battery is connected with the second end of the high-voltage direct current connector, the third end of the high-voltage direct current connector is connected with the first end of the flyback circuit and the positive electrode of the first capacitor, the fourth end of the high-voltage direct current connector is connected with the second end of the flyback circuit and the negative electrode of the first capacitor, the positive electrode of the low-voltage battery is connected with the first end of the low-voltage direct current connector, the third end of the low-voltage direct current connector is connected with the third end of the flyback circuit, the fourth end of the low-voltage direct current connector is connected with the fourth end of the flyback circuit, and the pre-charging of the low-voltage battery to the first capacitor is realized. The embodiment of the application can improve the reverse pre-charging efficiency.

Inventors

CHEN Jin
HOU CUNFENG
LIU PENGFEI
DU YIMING
WU RENHUA

Assignees

深圳欣锐科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250415

Claims (10)

1. The pre-charging system is characterized by comprising a high-voltage battery, a high-voltage direct-current connector, a flyback circuit, a low-voltage direct-current connector, a first capacitor and a low-voltage battery, wherein the positive electrode of the high-voltage battery is connected with the first end of the high-voltage direct-current connector, the negative electrode of the high-voltage battery is connected with the second end of the high-voltage direct-current connector, the third end of the high-voltage direct-current connector is connected with the first end of the flyback circuit and the positive electrode of the first capacitor, the fourth end of the high-voltage direct-current connector is connected with the second end of the flyback circuit and the negative electrode of the first capacitor, the positive electrode of the low-voltage battery is connected with the first end of the low-voltage direct-current connector, the third end of the low-voltage direct-current connector is connected with the fourth end of the flyback circuit, and the fourth end of the low-voltage direct-current connector is connected with the fourth end of the flyback circuit; And the flyback circuit is used for realizing the pre-charging of the low-voltage battery to the first capacitor.
2. The priming system of claim 1, wherein said flyback circuit comprises a first transformer module, a first switching tube and a first diode, wherein a first end of a primary winding of said first transformer module is connected to a third end of said low voltage DC connector, a second end of a primary winding of said first transformer module is connected to a first end of said first switching tube, a second end of said first switching tube is connected to a fourth end of said low voltage DC connector, a first end of a secondary winding of said first transformer module is connected to an anode of said first diode, a cathode of said first diode is connected to a third end of said high voltage DC connector, and a second end of a secondary winding of said first transformer module is connected to a fourth end of said high voltage DC connector.
3. The priming system of claim 2, wherein the first transformation module comprises a first transformer or a first transformer.
4. The priming system of claim 1, wherein said flyback circuit comprises a second transformer module, a second switching tube, a third switching tube, a second diode, a third diode, a fourth diode, a first inductor and a second inductor, wherein a first end of said second switching tube is connected to a negative pole of said second diode and a third end of said low voltage DC connector, a second end of said second switching tube is connected to a first end of said first inductor and a negative pole of said third diode, a second end of said first inductor is connected to a first end of said second inductor and a first end of a primary winding of said second transformer module, a positive pole of said second diode is connected to a first end of said third switching tube and a second end of a primary winding of said second transformer module, a second end of said third switching tube is connected to a positive pole of said third diode and a negative pole of said low voltage DC connector, a second end of said second switching tube is connected to a positive pole of said second diode is connected to a second end of said high voltage DC connector, and a positive pole of said fourth diode is connected to a second end of said high voltage DC connector.
5. The priming system of claim 4, wherein the second transformation module comprises a second transformer or a second transformer.
6. The priming system of claim 1, wherein said flyback circuit comprises a third transformer module, a fourth switching tube, a fifth diode, a sixth diode, a second capacitor, and a first resistor, wherein a first end of said first resistor is connected to a first end of said second capacitor, a first end of a primary winding of said third transformer module, and a third end of said low voltage DC connector, a second end of said first resistor is connected to a second end of said second capacitor and a negative electrode of said fifth diode, a positive electrode of said fifth diode is connected to a second end of a primary winding of said third transformer module and a first end of said fourth switching tube, a second end of said fourth switching tube is connected to a fourth end of said low voltage DC connector, a first end of a secondary winding of said third transformer module is connected to a positive electrode of said sixth diode, a negative electrode of said sixth diode is connected to a third end of said high voltage DC connector, and a fourth end of said third secondary winding is connected to a high voltage DC connector.
7. The priming system of claim 1, wherein said flyback circuit comprises a fourth transformer module, a fifth switching tube, a sixth switching tube, a seventh diode, a third capacitor and a third inductor, wherein a first end of said third capacitor is connected to a first end of said third inductor, a first end of a primary winding of said fourth transformer module and a third end of said low voltage DC connector, a second end of said third capacitor is connected to a first end of said fifth switching tube, a second end of said fifth switching tube is connected to a second end of said third inductor, a first end of said sixth switching tube and a second end of a primary winding of said fourth transformer module, a second end of said sixth switching tube is connected to a fourth end of said low voltage DC connector, a first end of a secondary winding of said fourth transformer module is connected to a positive electrode of said seventh diode, a negative electrode of said seventh diode is connected to a third end of said high voltage DC connector, and a fourth end of said fourth secondary winding is connected to a fourth end of said high voltage DC connector.
8. The pre-charge system of any one of claims 1-7, wherein the high voltage battery and the low voltage battery are located on the same side of a vehicle.
9. The priming system according to any one of claims 1 to 7, wherein the power of the flyback circuit is less than a set threshold.
10. A vehicle comprising a priming system as claimed in any one of claims 1 to 9.

Description

Pre-charging system and vehicle Technical Field The application relates to the technical field of electronic circuits, in particular to a pre-charging system and a vehicle. Background A Direct current-Direct current (DC-DC) converter is a key component of an electrical system of a new energy automobile, and a reverse pre-charging function of the DC-DC converter is generally implemented through a reverse pre-charging circuit. The current reverse pre-charge circuit is generally integrated in a DC-DC converter, and the reverse pre-charge efficiency is low. Disclosure of utility model The embodiment of the application provides a pre-charging system and a vehicle, which can improve reverse pre-charging efficiency. The first aspect of the embodiment of the application provides a pre-charging system, which comprises a high-voltage battery, a high-voltage direct-current connector, a flyback circuit, a low-voltage direct-current connector, a first capacitor and a low-voltage battery, wherein the positive electrode of the high-voltage battery is connected with the first end of the high-voltage direct-current connector, the negative electrode of the high-voltage battery is connected with the second end of the high-voltage direct-current connector, the third end of the high-voltage direct-current connector is connected with the first end of the flyback circuit and the positive electrode of the first capacitor, the fourth end of the high-voltage direct-current connector is connected with the second end of the flyback circuit and the negative electrode of the first capacitor, the positive electrode of the low-voltage battery is connected with the first end of the low-voltage direct-current connector, the third end of the low-voltage direct-current connector is connected with the third end of the flyback circuit, and the fourth end of the low-voltage direct-current connector is connected with the fourth end of the flyback circuit; And the flyback circuit is used for realizing the pre-charging of the low-voltage battery to the first capacitor. In the embodiment of the application, the high-voltage direct current connector is an interface for connecting the high-voltage battery and the flyback circuit, and the low-voltage direct current connector is an interface for connecting the low-voltage battery and the flyback circuit. The high-voltage direct current connector and the low-voltage direct current connector can enable the DC-DC converter to be well matched with the whole vehicle, and good waterproof and dustproof effects of the vehicle can be guaranteed. Flyback circuits are more efficient at low power (e.g., within 400W) than integrating a reverse precharge circuit in a DC-DC converter. The reverse pre-charging power of the flyback circuit is generally about 100W, and the pre-charging system of the embodiment of the application can improve the reverse pre-charging efficiency. Optionally, the flyback circuit comprises a first voltage transformation module, a first switch tube and a first diode, wherein a first end of a primary coil of the first voltage transformation module is connected with a third end of the low-voltage direct current connector, a second end of the primary coil of the first voltage transformation module is connected with a first end of the first switch tube, a second end of the first switch tube is connected with a fourth end of the low-voltage direct current connector, a first end of a secondary coil of the first voltage transformation module is connected with an anode of the first diode, a cathode of the first diode is connected with a third end of the high-voltage direct current connector, and a second end of a secondary coil of the first voltage transformation module is connected with a fourth end of the high-voltage direct current connector. In the embodiment of the application, the flyback circuit has a simple structure, and can realize the function of pre-charging when the first switching tube is in a conducting state, so that the pre-charging of the first capacitor by the low-voltage battery can be controlled. Optionally, the first transformation module includes a first transformer or a first transformer. In the embodiment of the application, the first transformation module can be realized by a first transformer or a first transformer. The first transformer may comprise a voltage transformer or a current transformer. The flyback circuit comprises a second transformer module, a second switch tube, a third switch tube, a second diode, a third diode, a fourth diode, a first inductor and a second inductor, wherein the first end of the second switch tube is connected with the negative pole of the second diode and the third end of the low-voltage direct current connector, the second end of the second switch tube is connected with the first end of the first inductor and the negative pole of the third diode, the second end of the first inductor is connected with the first end of the second inductor and