Patent ID: 8791702
Filing Date: 2014-07-29
Classification: B60L,G01R,H02H

Abstract:
1. A ground fault detection circuit that detects the occurrence of a ground fault of a battery that is insulated, comprising: an AC signal generation section that generates an AC signal; a first capacitive element that couples the AC signal generated by the AC signal generation section to the battery; a voltage division section that voltage divides the AC signal that is coupled to the battery by the first capacitive element; a ground fault detection unit that detects a ground fault of the battery based on an AC component of an input signal; and a second capacitive element that couples the AC signal that has been voltage divided by the voltage division section to the ground fault detection unit as the input signal, wherein, the AC signal voltage divided by the voltage division section is inputted to the ground fault detection unit via the second capacitive element, in which the AC signal generated by the AC signal generation section is superimposed upon the voltage of the battery by being coupled to the battery by the first capacitive element, is voltage divided by the voltage division section.