Insulation resistance detection circuit, insulation resistance detection method thereof and automobile

Abstract

The invention provides an insulation resistance detection circuit, an insulation resistance detection method thereof and an automobile. The circuit comprises a first insulation resistor of a battery positive electrode to a machine shell ground, a second insulation resistor of a battery negative electrode to the machine shell ground, a single-path resistance bridge detection circuit and an in-phase addition circuit. The first end of the single-path resistance bridge detection circuit is connected with the first insulation resistor, and the first end of the single-path resistance bridge detection circuit is connected with the second insulation resistor; and the second end of the single-path resistance bridge detection circuit is connected with the in-phase addition circuit. According to the insulation resistance detection circuit, the technical problems that in the prior art, an insulation resistance detection circuit is large in number of components, high in fault probability and high in cost are solved.

Description

technical field [0001] The present application relates to the field of circuit technology, in particular to an insulation resistance detection circuit, an insulation resistance detection method thereof, and an automobile. Background technique [0002] Since the vehicle is often in harsh environments such as vibration, high temperature, high humidity, and gas corrosion during driving, the insulation characteristics are prone to change. The insulation resistance detection circuit in the prior art adopts a double-bridge detection circuit, such as figure 1 As shown, including the upper bridge detection resistor and the lower bridge detection resistor, many measuring resistors are used, and the probability of short circuit, open circuit, large resistance deviation and other faults is relatively high, which will cause the detection circuit to fail to work or the insulation resistance to be detected. Inaccurate situation, which leads to misjudgment of the safety warning system, an...

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Problems solved by technology

[0003] The purpose of the embodiments of the present application is to provide an insulation resistance detection circuit and its insulation resistance detection method, and an automobile, which solves the technical problems of the existing technology that the insulation resistance detection circuit has many components, high probability of failure, and high cost

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