Charging circuit with battery charge monitor circuit

Details Charging circuit with battery charge monitor circuit Charging circuit with battery charge monitor circuit

1994-06-24

1996-10-08

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 39, H02J 704

Patent

active

055634958

ABSTRACT:
A charging circuit charges a nickel-cadmium battery by means of a constant current source. A resistor, diodes and a tantalum capacitor are connected between an output terminal of the charging circuit and a ground potential. A junction between the capacitor and the diode is connected to one input terminal and an output terminal of a comparator and to the output terminal of the charging circuit. The other input terminal of the comparator is supplied with a reference potential. An output signal having a period which depends on a voltage of the battery is generated at the output terminal. The diodes compensate for a variation of the period of the output signal caused by temperature dependent capacitance change of the capacitor.

REFERENCES:
patent: 4213081 (1980-07-01), Taylor
patent: 4370606 (1983-01-01), Kakumoto et al.
patent: 4746854 (1988-05-01), Baker et al.
patent: 4918368 (1990-04-01), Baker et al.
patent: 5212439 (1993-05-01), Sano et al.

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