Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1983-08-18
1985-07-23
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 35, 320 39, 320 53, 323278, H01M 1044
Patent
active
045310831
ABSTRACT:
A battery charger which includes terminals for connection to an electric power source, an electrical charging circuit and an operative arrangement for connecting at least one rechargeable battery cell in series with the charging circuit across the terminals. The battery charger has a charging circuit which includes a first resistor, a second resistor, a third resistor and a rectifier, constituted by at least one diode, in series. A first transistor, which has a collector-emitter path and a base-emitter path, is operatively connected so that the base-emitter path is connected in parallel with the first resistor. A fourth resistor is provided, the fourth resistor being connected in series with the collector-emitter path of the transistor and the third resistor. In one species, a plurality of additional transistors, connected in Darlington configuration, includes a second transistor and a final transistor, each of the additional transistors having its collector connected to a circuit point between the third resistor and an electrode of the diode. The first transistor and the last transistor in the one species have their emitters connected via a current-limiting PTC fifth resistor which may act as a fuse. The first transistor and the second transistor have their respective collector and base conductively connected. In another species, a field effect transistor, preferably a MOSFET, is used instead of the Darlington configuration. The connection of the third resistor provides internal feedback. The fifth resistor, when in series with the first resistor in the base-emitter circuit, provides external feedback.
REFERENCES:
patent: 3582713 (1971-06-01), Till
patent: 3889171 (1975-06-01), Hunter, Jr.
patent: 3943423 (1976-03-01), Hoffman
Rehak, Peter H., "Micropower Voltage Regulator with Very Low V.sub.out -V.sub.in ", Jun. 1980, Electronic Engineering, vol. 52, No. 639, p. 19.
Ault Anita M.
Bloom Leonard
Solid State Chargers Research and Development Limited Partnershi
Wong Peter S.
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