Device and method for testing insulation performance of high-voltage control box of electric vehicle

Abstract

Embodiments of the present invention provide a device and method for testing the insulation performance of a high-voltage control box of an electric vehicle. The device includes: a high-voltage power supply, a relay switch matrix circuit, an adapter wiring harness, a programmable logic device, an acquisition circuit, and a single-chip microcomputer; the single-chip microcomputer sends control instructions to the programmable logic device according to the detected high-voltage level, and the programmable logic device switches the corresponding relay switch Closed; the relay switch matrix circuit transmits the high-voltage current output by the high-voltage power supply to the transfer harness through the closed relay switch. The transfer harness transfers high voltage current to the gated connector terminals. The acquisition circuit is connected to the conductive part of each connector terminal of the high-voltage wire harness, and the collected voltage value is transmitted to the single-chip microcomputer, and the single-chip microcomputer calculates the insulation resistance value according to the voltage value. The invention realizes the automation and intelligence of the insulation resistance test by adopting the control of the single-chip microcomputer and the programmable logic device, thereby reducing the workload of the quality inspectors.

Description

technical field [0001] The invention relates to the technical field of insulation performance testing, in particular to a device and method for testing the insulation performance of a high-voltage control box 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] Electric vehicle high-voltage control box is an important component of electric vehicles as a power distribution and protection device for power batter...

AI Technical Summary

Problems solved by technology

[0007] The disadvantage of the method for detecting the insulation resistance value of the connector and the high-voltage control box with many pins in the above-mentioned prior art is: because the high-voltage connector terminals of the high-voltage control box are more and more densely distributed, it is difficult to test a certain terminal. It is easy to touch other terminals when

It is time-consuming and inconvenient to manually connect the wires and define the plug-in wires according to the pins for each test.

Due to the large number of pins, it takes a long time for manual operation, and the detection results depend largely on the technical level and work experience of the personnel, and it is easy to miss and erroneously check.

When testing some connectors with pins, the test clips can easily cause the pins of the connector to be short-circuited, making it difficult to make a real judgment on its insulation performance

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