Resistance on-line detection circuit, insulation resistance detection circuit and automobile

Abstract

The invention relates to a resistor on-line detection circuit, an insulation resistor detection circuit and an automobile, and the resistor on-line detection circuit is provided with a standard resistor unit, an on-line verification switch array circuit, a divider resistor unit and a sampling resistor. A plurality of divider resistors connected in series with the divider resistor unit are electrically connected with the sampling resistor in sequence by adopting an online verification switch array circuit, and the current resistance value of the sampling resistor is determined based on the standard resistance value of the standard resistor unit through a detection unit of the insulation resistor detection circuit when the standard resistor unit is connected with the sampling resistor; when each divider resistor is correspondingly connected with the sampling resistor, on-line resistance values of the divider resistors are determined based on the current resistance values; the insulation resistance detection circuit comprises two paths of port switches, two paths of insulation detection circuits and a commutation unit, and multiplexing of the two paths of insulation detection circuits is carried out through the commutation unit. According to the invention, the beneficial effects of improving the insulation resistance detection precision and ensuring the reliability of the detection circuit are realized.

Description

technical field [0001] The present application relates to the technical field of automobiles, in particular to an online resistance detection circuit, an insulation resistance detection circuit and an automobile. Background technique [0002] Vehicles are often in harsh environments such as vibration, high temperature, high humidity, and gas corrosion during driving, and the insulation properties are prone to change. Once the insulation performance deteriorates, flashover breakdowns between the electrodes of the power battery pack are prone to occur and the battery will cause huge property damage. loss or pose a huge threat to the personal safety of vehicle personnel. [0003] The insulation resistance detection technology in the related art is based on the detection and calculation based on the known resistance value of the voltage dividing resistor. There is a deviation between the known value of the voltage-dividing resistance and the actual value when the insulation res...

AI Technical Summary

Problems solved by technology

[0005] The application provides an online resistance detection circuit, an insulation resistance detection circuit, and a car, to at least solve the problem of power failure due to the deviation between the known value of the measured voltage dividing resistance and the actual value when the insulation resistance is detected in the related art. The problem of the decrease of the detection accuracy of the insulation resistance of the battery pack

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