Active discharging method for high-voltage direct-current bus, vehicle-mounted DC / DC conversion device and electric vehicle

CN119628427APending Publication Date: 2025-03-14HANGZHOU EV TECH CO LTD
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Patent Information

Application Number
CN202411772932.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-04
Publication Date
2025-03-14

AI Technical Summary

Technical Problem

The active discharge technology of existing high-voltage electrical systems of electric vehicles has problems such as slow discharge speed, complex control, and large impact current, which is difficult to meet the safety needs of higher voltage levels.

Method used

The cascade connection between the medium and high voltage bidirectional DC/DC converter and the low voltage DC/DC converter is adopted to realize the active discharge of the high voltage DC bus through the detection circuit and control unit. Specific steps include receiving an active discharge command, detecting the high-voltage DC bus voltage, and controlling the converter to work at the same time to discharge the power to the capacitor or consumption until the voltage drops to the set value.

Benefits of technology

It improves the discharge speed of the high-voltage DC bus, simplifies control logic, reduces impact current, meets the safety requirements of higher voltage levels, and does not require adding hardware circuits, reducing design difficulty and cost.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The invention provides a high-voltage direct-current bus active discharging method, a vehicle-mounted DC / DC conversion device and an electric vehicle. The method comprises the steps that S1, an active discharging instruction is received; s2, a high-voltage direct-current bus voltage value VC2 on the high-voltage direct-current bus is obtained through a detection circuit; s3, judging whether the high-voltage direct-current bus voltage value VC2 is greater than an active discharge voltage set value or not, and if so, entering step S4; s4, controlling the high-voltage bidirectional DC / DC converter and the low-voltage DC / DC converter to work at the same time so as to discharge the electric energy on the high-voltage DC bus to the first capacitor or consume the electric energy by the high-voltage bidirectional DC / DC converter and discharge the electric energy on the high-voltage DC bus to the low-voltage battery or consume the electric energy by the low-voltage DC / DC converter, and entering the step S5; and S5, judging whether the high-voltage direct-current bus voltage value VC2 is smaller than or equal to an active discharge voltage set value, if so, ending discharge, and if not, entering the step S4.
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Citation Information

Patent Citations

  • Hybrid active discharge circuit and control method thereof

    CN112455282A

  • Integrated power domain power supply system and device and electric vehicle

    CN118300410A

  • Method and system for controlling rapid discharge of high-voltage bus capacitor, and vehicle controller

    CN118631037A

  • Vehicle bus capacitor pre-charging system and pre-charging control method

    CN118826216A

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Cited By

  • Active discharge method for high-voltage direct-current bus, vehicle-mounted DC / DC conversion device, and electric vehicle

    WO2026118766A1