Discharge control circuit used for motor controller and meeting function safety requirements

Abstract

The invention provides a discharge control circuit used for a motor controller and meeting function safety requirements. The circuit includes a low voltage energy storage module, a low voltage controlmodule, a high-low voltage isolation module and a switch control discharge module, wherein the output terminal of the low voltage control module and the output terminal of the low voltage energy storage module are connected with the input terminal of the high-low voltage isolation module; the input terminal of the switch control discharge module is connected with the output terminal of the high-low voltage isolation module and battery voltage. The switch control discharge module includes a control unit, a discharge unit and a bus support capacitor, wherein the control unit is connected with the discharge unit in series and is then connected with a bus support capacitor in parallel. After a control power source receives discharge signals, the discharge unit is controlled to discharge energy stored in the bus support capacitor below a safety voltage. The invention has beneficial effects of high safety, elimination of threats to drivers and operators due to high voltage and discharge quickness and reliability.

Description

technical field [0001] The invention relates to the field of motor controller discharge, in particular to a motor controller discharge control circuit satisfying functional safety. Background technique [0002] New energy electric vehicles are favored by the market and consumers because of their energy saving, emission reduction, low pollution, clean environment and air, low noise and high energy efficiency. However, the battery voltage of electric vehicles is usually high voltage Electricity, which is easy to pose a threat to the lives of personnel; usually in order to reduce the input ripple of the controller and the problem of energy storage near the IGBT, we will set a capacitor with a large capacity inside the controller, and the capacitor will be stored after the motor controller is powered on. If there is no relevant discharge circuit after power off, it is difficult to quickly release a large amount of charge in a short period of time; now it is commonly used to dire...

AI Technical Summary

Problems solved by technology

[0004] After the high-voltage power supply is powered off, the residual voltage on the bus capacitor cannot be released to a safe value immediately, which may cause electric shock threats to the lives of operators such as after-sales maintenance and testing, and a series of serious safety problems

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