Insulation resistance detection circuit and system

By setting a voltage isolation sampling circuit and multiple isolating switches in the insulation resistance detection circuit, the problem that the detection circuit in the prior art is not fully isolated is solved, and the reliability and safety of detection are improved.

CN119644144APending Publication Date: 2025-03-18DONGFENG COMML VEHICLE CO LTD
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Patent Information

Application Number
CN202411742878.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-29
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

The existing insulation resistance detection circuit has not achieved full isolation detection, and there is a problem that the power battery high-voltage circuit affects the low-voltage control driving circuit, resulting in a reduction in detection reliability and an increase in safety risks.

Method used

An insulation resistance detection circuit is designed. By setting up a voltage isolation sampling circuit and multiple isolating switches, the resistance voltage divider circuit is isolated from the control driving circuit to avoid the high-voltage circuit affecting the low-voltage driving circuit.

Benefits of technology

The insulation resistance detection of the positive and negative electrodes of the power battery to be tested against the PE case is realized, and the reliability and safety of the detection circuit are improved.

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Abstract

The invention discloses an insulation resistance detection circuit and system, and relates to the technical field of power battery insulation resistance detection, the insulation resistance detection circuit comprises a resistance voltage division circuit, a voltage isolation sampling circuit, a plurality of isolation switches and a control drive circuit, each isolation switch end and the input end of the voltage isolation sampling circuit are connected with the resistance voltage division circuit; the control driving circuit is connected with the output end of the voltage isolation sampling circuit and the control ends of the plurality of isolation switches, and is configured to drive the plurality of isolation switches to act, so that the resistance voltage division circuit and the power battery to be detected work in different detection states; detection voltages of the resistance voltage division circuit in different detection states are obtained through the voltage isolation sampling circuit; and determining the insulation resistance of the to-be-detected power battery according to the detection voltage of the resistance voltage division circuit in different detection states and the resistance value of the resistance voltage division circuit. The invention can prevent the high-voltage circuit of the power battery from influencing the low-voltage control drive circuit, and improves the reliability and safety of the circuit.
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