Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1978-06-27
1980-09-02
Hickey, Robert J.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 23, 320DIG1, H02J 700
Patent
active
042209056
ABSTRACT:
A battery charging circuit includes a switching transistor which controls the flow of charging current to the battery at a high rate or a low rate. The operation of the transistor is, in turn, controlled by a voltage sensing circuit which includes a voltage detector module characterized in a very low current drain. The battery is, in fact, isolated from the charging circuit by a diode; the sensing circuit, however, is not isolated from the battery by a diode. This arrangement permits a more sensitive voltage detection and a more accurate control over the switching transistor. A desirable switching hysteresis is built into the sensing circuit but is operable to allow the hysteresis loop to be eliminated for purposes of calibration.
REFERENCES:
patent: 3517294 (1970-06-01), Ruben
patent: 3531706 (1970-09-01), Mullersman
patent: 3553562 (1971-01-01), Woods
patent: 3602794 (1971-08-01), Westhaver
patent: 3659181 (1972-04-01), Bembenek
patent: 3699422 (1972-10-01), Miller et al.
patent: 3919618 (1975-11-01), Coleman et al.
Intersil Products Catalog-Circuit Description ICL8211, ICL8212, pp. 63-72.
Gates Battery Appl. Manual, pp. 36, 37, "Two Step Constant Current Chargers."
Burton L. D.
Hickey Robert J.
Honeywell Inc.
Marhoefer L. J.
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