Applicant: Seiko Instruments Inc, Japan
A battery state monitoring circuit using a low breakdown voltage and simple circuitry forms the subject of this patent. It is capable of coping with variations in a number of batteries. A battery device is also provided. The battery state monitoring circuit is composed of a first voltage monitoring terminal and a second voltage monitoring terminal; a first transmission terminal and a second transmission terminal; and a first reception terminal and a second reception terminal. Also included is a control terminal; an overcharge detection circuit, for detecting whether or not a battery is in an overcharged state, based on the voltage between the first and second voltage monitoring terminals; and a way of outputting an overcharge signal to indicate the detection result. The system also uses an overcharge information communication circuit for transmitting the overcharge signal, which indicates overcharge state, from the first transmission terminal to the outside world, in the case where at least one of the overcharge signals indicates whether or not a battery is in an overcharge state, and the overcharge detection signal received through the first reception terminal indicates an overcharge state.
Patent number: WO/2009/008314
Inventors: A. Sakurai and K. Sano
Publication date: 15 January 2009
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