Patent Number: 8,797,042

Title: Ground fault detection circuit and ground fault detection apparatus

Abstract: A ground fault detection circuit includes: a first switch circuit that connects/disconnects a first path between a positive bus bar and a ground potential section, the positive bus bar being connected to positive electrodes of secondary battery units through a field-effect transistor including a parasitic diode; a second switch circuit that connects/disconnects a second path between a negative bus bar and a ground potential section, the negative bus bar being connected to negative electrodes of the secondary battery units; and a ground fault detection unit that detects 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.

Inventors: Ike; Takehito (Moriguchi, JP), Abe; Takayoshi (Moriguchi, JP), Nakai; Tomomichi (Moriguchi, JP), Nakashima; Takeshi (Moriguchi, JP), Ishimoto; Kazuo (Moriguchi, JP)

Assignee: Sanyo Electric Co., Ltd.

International Classification: G01N 27/416 (20060101)

Expiration Date: 8/05/12018