Ground fault detection circuit and ground fault detection apparatus

Abstract

A ground fault detection circuit may include a switch circuit that connects or disconnects a path between a bus bar connected to a secondary battery and a ground potential section; an I/V conversion resistance element for detecting a ground fault of the bus bar based on an electric current flowing through the path; and a resistance element connected in series to the I/V conversion resistance element.

What is claimed is: 
     
         1 . A ground fault detection circuit, comprising:
 a switch circuit that connects or disconnects a path between a bus bar connected to a secondary battery and a ground potential section;   an I/V conversion resistance element for detecting a ground fault of the bus bar based on an electric current flowing through the path; and   a resistance element connected in series to the I/V conversion resistance element.   
     
     
         2 . A ground fault detection circuit, comprising:
 a first switch circuit that connects or disconnects a first path between a positive bus bar connected to a positive terminal of a secondary battery and a ground potential section;   a second switch circuit that connects or disconnects a second path between a negative bus bar connected to a negative terminal of the secondary battery and the ground potential section;   an I/V conversion resistance element for detecting a ground fault of the positive bus bar or the negative bus bar based on an electric current flowing through the first path or the second path; and   a resistance element connected in series to the I/V conversion resistance element.   
     
     
         3 . A ground fault detection circuit, comprising:
 a first switch circuit that connects or disconnects a first path between a positive bus bar connected to a positive terminal of a secondary battery and a ground potential section;   a second switch circuit that connects or disconnects a second path between a negative bus bar connected to a negative terminal of the secondary battery and the ground potential section;   an I/V conversion resistance element for detecting a ground fault of the positive bus bar or the negative bus bar based on an electric current flowing through the first path or the second path; and   a resistance element connected in series to the I/V conversion resistance element, the resistance element being connected to front side of the first switch circuit and the second switch circuit.