Device and method for measuring insulation performance of high-voltage wire harness of electric vehicle

Abstract

Embodiments of the present invention provide a device and method for measuring the insulation performance of a high-voltage wire harness of an electric vehicle. The device includes: a voltage dividing resistor circuit, a comparison circuit, a programmable logic device and a single-chip microcomputer. The programmable logic device controls and closes a voltage dividing resistor branch in the voltage dividing resistor circuit. The input end of the voltage dividing resistor circuit is connected to the high-voltage wiring harness to be detected, and the comparison circuit compares the output voltage of the voltage dividing resistor circuit with the set reference voltage. , and output high level, low level or zero level according to the comparison result; the microcontroller calculates the value to be Detect the resistance range of the insulation resistance of the connector terminal of the high-voltage wire harness. The invention effectively combines the single-chip control and the level type output by the comparator, and realizes the automatic and intelligent measurement of the resistance range of the insulation resistance of the connector terminal of the high-voltage wire harness.

Description

technical field [0001] The invention relates to the technical field of insulation performance detection, in particular to a device and method for measuring the insulation performance of a high-voltage wire harness of an electric vehicle. Background technique [0002] The insulation performance test is an important indicator in the safety requirements test of electrical equipment, and it is also one of the main parameters to effectively judge whether the insulator is complete and whether the surface of the insulator is polluted. In order to judge the insulation performance of electrical equipment, the insulation resistance test is A common and very effective method. By measuring the insulation resistance value of electrical equipment, defects such as general damp, local severe damp and penetration can be detected in time. [0003] The high-voltage wiring harness of electric vehicles acts as a bridge between the high-voltage control box and the high-voltage electrical applian...

AI Technical Summary

Problems solved by technology

[0007] The shortcoming of the method for measuring the insulation resistance value of the connector and the high-voltage wiring harness with many pins in the above-mentioned prior art is: due to the change of the external environment, the resistance range of the insulation resistance of the connector terminal of the high-voltage wiring harness changes. Larger, this method directly uses the voltage follower and A / D converter to read the voltage value of the conductive part of the connector terminal of the high-voltage wire harness to be detected, which will lead to large errors in the collection results, and it is difficult to insulate the connector terminals of the high-voltage wire harness. The performance makes a real judgment, and the resistance range of the insulation resistance of the connector terminal of the high-voltage wire harness cannot be accurately judged, and the test results are not clear.

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