Patent Number: 6,310,463

Title: Secondary battery cell protection circuit

Abstract: A secondary battery cell protection circuit includes an overcharge detection circuit detecting overcharge of a secondary battery cell, an overcharge prevention MOS transistor including a body-diode which is deactivated by a signal supplied from the overcharge detection circuit when the secondary battery cell is overcharged so as to suspend charging of the secondary battery cell, a discharge detection circuit detecting discharge of the secondary battery cell by comparing a voltage drop through the body-diode of the overcharge prevention MOS transistor with a first standard voltage, and a circuit that activates the overcharge prevention MOS transistor when the discharge detection circuit detects the discharge of the secondary battery cell.

Inventors: Nagaoka; Hiroshi (Atsugi, JP), Terada; Yukihiro (Atsugi, JP)

Assignee: Mitsumi Electric Co., Ltd.

International Classification: H02J 7/00 (20060101); H02J 007/00 ()

Expiration Date: 10/30/2018