Patent ID: 8232806
Filing Date: 2012-07-31
Classification: B60L,G01R

Abstract:
1. An insulation state detector for detecting an insulation state with respect to a ground potential portion of a DC power source, in which a positive-side Y capacitor is provided between the ground potential portion and a positive electrode of the DC power source and a negative-side Y capacitor is provided between the ground potential portion and a negative electrode of the DC power source, on the basis of a charging voltage of a flying capacitor, which is charged by the DC power source, in a state that the DC power source is insulated from the ground potential portion and a charging voltage of the flying capacitor, which is charged by the DC power source and the Y capacitors, in a ground fault state where one of the positive and negative electrodes of the DC power source is connected to the ground potential portion by a positive-side ground fault resistor or a negative-side ground fault resistor, the insulation state connector comprising: a detecting section that detects the insulation state of the DC power source by defining the charging voltage of the flying capacitor in the ground fault state as a charging voltage based on the Y capacitors and the DC power source in the case that it is set that the Y capacitors have assumed capacitances different from actual capacitances of the Y capacitors, in an unbalanced state where voltages across both ends of the positive-side Y capacitor and the negative-side Y capacitor are not equal to voltages obtained by dividing the voltage of the DC power source according to a voltage division ratio of the positive-side ground fault resistor and the negative-side ground fault resistor.