Patent ID: 9069024
Filing Date: 2015-06-30
Classification: B60L,G01R

Abstract:
1. An insulation resistance measurement circuit comprising: a source resistance unit including a first source resistance unit connected to a positive terminal of an insulation resistance measurement battery and a second source resistance unit, and the second source resistance unit connected to a negative terminal of the insulation resistance measurement battery and the first source resistance unit; a voltage sensing unit including a first operational amplifier sensing a voltage of the first source resistance unit, as a first voltage, and a second operational amplifier sensing a voltage of the second source resistance unit, as a second voltage; a leakage current interrupting unit including a first switch connected to the positive terminal of the insulation resistance measurement battery and the first source resistance unit and a second switch connected to the negative terminal of the insulation resistance measurement battery and the second source resistance unit; a measurement circuit testing unit including a third switch connected to the first operational amplifier and a first voltage source, and a fourth switch connected to the second operational amplifier and a second voltage source; and an insulation resistance measurement unit measuring insulation resistance of the insulation resistance measurement battery through the first and second voltages, wherein the measurement circuit testing unit opens the first and second switches and closes the third and fourth switches, and measures the first and second voltages to determine whether or not the first and second operational amplifiers have an error, thereby enabling self-testing.