Y capacitor balance detection method, system and circuit

Abstract

The invention provides a Y capacitor balance detection method, system and circuit. The method comprises the following steps of: continuously acquiring a first voltage of a first insulation detection point and a second voltage of a second insulation detection point on a voltage division circuit connected in parallel with a Y capacitor in an insulation detection circuit; respectively calculating theslope K1 of the first voltage and the slope K2 of the second voltage which are continuously acquired; calculating a slope difference K12 between the first voltage and the second voltage; and judgingwhether the charge on the Y capacitor is balanced or not according to the values of K1, K2 and K12. After the technical scheme is adopted, the detection of the charge balance on the Y capacitor is converted into the detection of the relationship between the slopes of the insulation detection points, the measurement is simple and reliable, whether the charge on the Y capacitor is balanced or not can be accurately judged when the battery voltage does not fluctuate, fluctuates upwards or fluctuates downwards, the waiting time of the insulation detection is reduced, and the accuracy of the insulation detection is ensured.

Description

technical field [0001] The present invention relates to the field of Y capacitance balance detection, in particular to a Y capacitance balance detection method, system and circuit. Background technique [0002] The measurement of the insulation resistance of the high-voltage power supply directly affects the safe operation of the high-voltage system. When the measured insulation resistance is lower than a certain safety value, it is necessary to disconnect the circuit in time to ensure safety. If the measured value of the insulation resistance is smaller than the actual value, It will cause circuit misoperation to disconnect the circuit, which is not conducive to the stable operation of the circuit. If the measured value of the insulation resistance is larger than the actual value, it will cause the actual insulation resistance to be lower than the safe value and not be discovered in time, which will bring potential safety hazards. . In the process of insulation detection, ...

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Problems solved by technology

In the prior art, by measuring the voltage of the insulation detection point, when the voltage of the insulation detection point is stable, the charge of the Y capacitor reaches balance, but this method is only applicable to the situation where the battery voltage does not fluctuate. When the battery voltage fluctuates, this method cannot judge Y Is the charge on the capacitor balanced?

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