Direct current conversion circuit, charging and discharging system and vehicle

By incorporating an inductor module and a switching bridge module into the DC-DC converter circuit, bidirectional DC boost and buck functions are achieved, solving the unidirectional problem of vehicle charging and discharging functions, improving user experience and compatibility, and reducing the risk of motor winding demagnetization and current ripple noise.

CN223451833UActive Publication Date: 2025-10-17BYD CO LTD +1
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Patent Information

Application Number
CN202422764973.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-12
Publication Date
2025-10-17
Estimated Expiration
2034-11-12

AI Technical Summary

Technical Problem

In the existing technology, the vehicle charging and discharging function only has unidirectional step-up and step-down voltage capability, which cannot meet the user's need for the flexibility of vehicle charging and discharging function, resulting in poor user experience, poor compatibility, and easy demagnetization of motor windings, large current ripple noise, and increased risk of product damage.

Method used

It adopts a DC-DC conversion circuit, including a high-voltage battery module, an inductor module, and a switch bridge module. By setting a first switching element to control the inductor module, it realizes bidirectional DC boost and buck functions, which has strong compatibility and improves user experience.

Benefits of technology

It achieves flexibility and compatibility in vehicle charging and discharging functions, reduces the risk of demagnetization of motor windings, lowers current ripple noise, and improves user experience.

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Abstract

The utility model discloses a direct current conversion circuit, a charging and discharging system and a vehicle. The direct-current conversion circuit comprises a high-voltage battery module, a direct-current charging port, an inductance module, a switch bridge module and a first switch element. One end of the inductance module is connected with the high-voltage battery module through the first switch element and further connected with the positive electrode of the direct-current charging port, and the other end of the inductance module is connected with the bridge arm midpoint of the switch bridge module. The anode of the high-voltage battery module is connected with the bridge arm anode of the switch bridge module and the anode of the direct-current charging port, and the cathode of the high-voltage battery module is connected with the bridge arm cathode of the switch bridge module and the cathode of the direct-current charging port. According to the embodiment of the invention, the first switch element is arranged between one end of the inductor module and the high-voltage battery module so as to control the switch bridge module, and bidirectional DC boost and buck are realized. Therefore, the requirement of a user for the flexibility of the charging and discharging function of the vehicle can be met, the compatibility is extremely high, and the user experience is greatly improved.
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