Active short circuit circuit device for electric drive system, control method thereof, and vehicle

By introducing an active short-circuit circuit device into the electric drive system and using switching elements such as IGBTs and voltage regulating elements such as diodes to control the current path, the problem of power module overheating damage caused by high back electromotive force in permanent magnet synchronous motors is solved, thus improving the safety and reliability of the system.

CN116667289BActive Publication Date: 2026-06-23CHINA FAW CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA FAW CO LTD
Filing Date
2023-06-27
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

In existing technologies, the high back electromotive force generated by permanent magnet synchronous motors under high-speed control is fed back to the inverter system, causing overvoltage in the electric drive inverter system and the vehicle's electronic control system. Furthermore, the large current during active short circuits causes the power module to heat up too quickly, posing a risk of damage.

Method used

Design an active short-circuit circuit device, including a power module and an active short-circuit auxiliary module. By switching the active short-circuit auxiliary module to form a closed loop with the three-phase input terminal of the motor during active short circuit, and using switching elements such as IGBT or MOSFET and voltage regulating elements such as diodes, the current path is controlled to avoid high-temperature damage.

Benefits of technology

It effectively reduces the risk of overheating damage to the power module under active short-circuit conditions, and improves the safety and reliability of the electric drive system.

✦ Generated by Eureka AI based on patent content.

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    Figure CN116667289B_ABST
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Abstract

The application provides an active short circuit device for an electric drive system, a control method thereof and a vehicle. The active short circuit device comprises: a power module, an input end of the power module being connected with a power supply of the vehicle, an output end of the power module being connected with three-phase input ends of a motor, the power module being used for converting an output current of the power supply into three-phase currents of the motor; an active short circuit auxiliary module, the active short circuit auxiliary module being arranged between the output end of the power module and the three-phase input ends of the motor; the active short circuit auxiliary module having an operating state and a closed state, when the active short circuit auxiliary module is in the operating state, the active short circuit auxiliary module and the three-phase input ends of the motor form a closed loop to realize an active short circuit function, when the active short circuit auxiliary module is in the closed state, the output end of the power module is connected with the three-phase input ends of the motor. In the scheme, the initial temperature of the active short circuit auxiliary module is low, and the active short circuit auxiliary module is not prone to over-temperature problems after entering the active short circuit state.
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