Power battery high-voltage interlocking detection circuit and method

Abstract

The invention provides a power battery high-voltage interlocking detection circuit comprising a controller unit and a high-voltage interlocking detection circuit; the high0voltage interlocking detection circuit comprises a first signal conversion module, a second signal conversion module and a differential comparison module. The first output port of the controller unit is connected with an input end of the first signal conversion module, and outputs a first PWM signal to the first signal conversion module; an output end of the first signal conversion module accesses an input end of a high-voltage loop. The second output port of the controller unit is connected with an input end of the second signal conversion module, and outputs a second PWM signal to the second signal conversion module; an input end of the second signal conversion module accesses an output end of the high-voltage loop; the output ends of the first signal conversion module simultaneously access one input end of the differential comparison module, and the output ends of the second signal conversion module simultaneously access the other input end of the differential comparison module. The output end of the differential comparison module accesses the first input port of the controller unit.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a power battery high-voltage interlock detection circuit and method. Background technique [0002] Since the power battery system of an electric vehicle is usually composed of multiple high-voltage subsystems, they are all connected to each other through high-voltage connectors. The operating environment is very harsh, and they are under vibration and shock conditions most of the time. Therefore, in order to ensure driving safety and the safety and reliability of vehicle equipment, the design of high-voltage interlocks becomes particularly critical. [0003] The design of high-voltage interlock technology is mainly to prevent the risk of high-voltage electric shock after high-voltage components are exposed. The existing high-voltage interlock technology generally uses low-voltage signals to check all the branches connected to the high-voltage bus on the ele...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the disadvantage of poor anti-interference in the traditional high-voltage interlock detection circuit, the embodiment of the present invention provides a high-voltage interlock detection circuit for power battery power distribution system, which can effectively suppress the electromagnetic interference existing in the electric vehicle power distribution system and enhance Improve the anti-interference of the existing detection circuit

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