Detection circuit and method

Abstract

The embodiment of the invention relates to the technical field of circuits, and discloses a detection circuit and method. The detection circuit comprises a controller, a battery pack, a main positiveswitch module, a main negative switch module and at least one detection loop. The controller closes the main positive switch module or the main negative switch module, collects the voltage of the positive electrode and the negative electrode of the battery pack and the voltage between the outer side of the main positive switch module and the outer side of the main negative switch module. After anydetection loop is closed, the voltages of the positive electrode and the negative electrode of the battery pack and the voltage between the outer side of the main positive switch module and the outerside of the main negative switch module are collected again, and the insulation resistance of the outer side is obtained according to the insulation resistance of the inner sides of the main positiveswitch module and the main negative switch module, the voltages of the positive electrode and the negative electrode of the battery pack collected twice and the voltage between the outer side of themain positive switch module and the outer side of the main negative switch module. According to the invention, the insulation resistance on the outer sides of the main positive switch module and the main negative switch module can be detected.

Description

Technical field [0001] The embodiment of the present invention relates to the field of circuit technology, and in particular to a detection circuit and method. Background technique [0002] With the development of battery technology, electric vehicles have become the development trend of the automotive industry instead of fuel vehicles. The power battery pack is a key component of an electric vehicle. The two sides of the electric vehicle's relay are grounded separately. When the relay is closed, the insulation performance of the electric vehicle will be tested to ensure the safety of high-voltage power. [0003] The inventor found that there are at least the following problems in the prior art: when testing the insulation performance of electric vehicles, only the resistance value of the insulation resistance inside the relay can be detected, and the resistance value of the insulation resistance outside the relay cannot be detected; The failure of the resistor can cause dangerous...

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Problems solved by technology

[0003] The inventor has found that at least the following problems exist in the prior art: when detecting the insulation performance of electric vehicles, only the resistance value of the insulation resistance inside the relay can be detected, and the resistance value of the insulation resistance outside the relay cannot be detected; if the insulation resistance outside the relay Failure of the resistor can cause dangerous contact between the high voltage of the power battery pack and the ground

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