Method and device for detecting insulation resistance

Abstract

The invention provides an insulation resistance detection method and device, which relate to the technical field of electric vehicle charging. By configuring the positive voltage divider switching module and the negative voltage divider switch module at the first resistance value, the acquisition control module determines the first ground voltage of the positive voltage divider switch module or the negative voltage divider switch module; and then configures the positive voltage divider The switching module or the negative voltage division switching module is at the second resistance value; so that the acquisition control module determines the second voltage to ground of the positive voltage division switching module or the negative voltage division switching module; finally according to the first voltage to ground, the second voltage to ground The voltage, the first resistance value and the second resistance value determine the first equivalent ground insulation resistance of the positive voltage output end and the second equivalent ground insulation resistance of the negative voltage output end. The insulation resistance detection method and device provided by the invention have the effect of being able to realize the detection of insulation resistance in a wide voltage range.

Description

technical field [0001] The invention relates to the technical field of electric vehicle charging, in particular to an insulation resistance detection method and device. Background technique [0002] With the deteriorating environment, people pay more and more attention to the field of new energy, so the equipment in the field of electric vehicles and related supporting facilities is rising rapidly. As an important supporting facility for electric vehicles, DC charging piles can quickly recharge electric vehicles. However, DC charging piles are usually installed in the open air. If they are affected by harsh conditions such as vibration, acid and alkali corrosion, salt spray, high temperature and high humidity, it may cause The aging and damage of power cables and other insulating materials of DC charging piles have potential safety hazards and cause insulation accidents. Therefore, in order to avoid the occurrence of insulation accidents, the most effective way is to add an...

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide an insulation resistance detection method to solve the problem that the insulation resistance cannot be detected in a wide voltage range in the prior art

[0005] Another object of the present application is to provide an insulation resistance detection device to solve the problem that the insulation resistance cannot be detected in a wide voltage range in the prior art

Images