High-voltage interlocking detection circuit and fault detection method

Abstract

According to a high-voltage interlocking detection circuit and a fault detection method disclosed by the invention, an open-circuit fault voltage threshold and a short-circuit fault voltage threshold are preset, and the connection state of the whole high-voltage loop can be detected in real time by controlling the on-off and step-by-step detection of the controllable switch in the control detection switch circuit, the early interlocking fault of poor contact of the high-voltage component can be effectively detected, and the high-voltage component is prevented from working with faults under the condition of poor contact. Due to the independent detection of each control detection switch circuit and the high-voltage component connected with the control detection switch circuit, the fault occurrence point of the high-voltage interlocking loop can be effectively detected, the manual troubleshooting of each section of line and each high-voltage component is avoided, and the troubleshooting efficiency is effectively improved.

Description

technical field [0001] The invention relates to the field of high-voltage interlock loop detection of new energy vehicles, in particular to a high-voltage interlock detection circuit and a fault detection method. Background technique [0002] New energy vehicles and power hybrid vehicles have many high-voltage components. With the rapid development of the new energy vehicle industry, the voltage and energy of vehicle batteries are also increasing. The voltage generally ranges from 300-800V, which is much higher than the national standard. The specified safety voltage is 30 volts DC and 60 volts AC. In order to ensure the safety of people and equipment, it is necessary to test the high-voltage interlock circuit of the vehicle to determine whether the connection of the high-voltage interlock circuit is normal. [0003] The high-voltage interlock circuit detection is used to judge whether the connectors on the entire high-voltage system circuit are in reliable contact, so that ...

AI Technical Summary

Problems solved by technology

[0004]However, in the existing high-voltage interlock circuit detection technology, it is impossible to diagnose the early interlock fault of poor contact of high-voltage components, and it often takes until a certain high-voltage component is actually disconnected After the high-voltage interlock open-circuit fault occurs, the fault location cannot be accurately located, and each high-voltage component needs to be manually checked, which is inefficient and wastes manpower and material resources.

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