Apparatus for temperature compensating one or more battery charg

Details Apparatus for temperature compensating one or more battery charg Apparatus for temperature compensating one or more battery charg

1990-07-16

1993-01-19

Stephan, Steven L.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 22, H02J 704

Patent

active

051809621

ABSTRACT:
An apparatus including a circuit which causes the float voltage of one or more battery chargers to change so as to compensate for changes in the ambient temperature of the batteries connected to the chargers. The circuit does not regulate the charge voltage to the battery but rather provides a battery temperature dependent variable voltage drop in the sense load of the charger(s). The circuit includes a thermistor which is used to sense the temperature of the battery. The temperature dependent resistance of the thermistor is used in a resistive divider for a reference voltage. Selection of the values for the divider components allows the battery temperature dependent variable reference voltage to be a linear approximation of the temperature compensation curve of the battery.

REFERENCES:
patent: 3600661 (1971-08-01), Briggs et al.
patent: 3852652 (1974-12-01), Jasinski
patent: 3917990 (1975-11-01), Sherman, Jr.
patent: 4013934 (1977-03-01), Frye
patent: 4220908 (1980-09-01), Nicol
patent: 4398140 (1983-08-01), Morishita
patent: 4667143 (1987-05-01), Cooper et al.
patent: 4847547 (1989-07-01), Eng, Jr.

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