Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1979-05-08
1981-09-22
Hickey, Robert J.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 40, 320 21, 323906, 368205, H02J 710, G04C 300
Patent
active
042912660
ABSTRACT:
The invention relates to an electronic device for charging an accumulator from an electric energy source, more particularly one or more solar cells, intended in particular for an electronic wristwatch. The device represents the equivalent of an ideal diode inserted between the source of electrical energy and the battery.
A solar cell (1) feeds a charging current to the accumulator (2) via a transistor (3) and, if desired, a diode (7) in parallel with the transistor (3). The conduction state of the transistor (3) is monitored by a differential amplifier (4) which has an off-set voltage (U.sub.off), the value and polarity of which are determined by a generator (5). This off-set voltage (U.sub.off) defines the voltage drop between the energy source and the accumulator (2) which is selected to be between 20 and 50 millivolts.
REFERENCES:
patent: 3222535 (1965-12-01), Engelhardt
patent: 3802178 (1974-04-01), Tsuruishi
patent: 4134057 (1979-01-01), Portmann
patent: 4183082 (1980-01-01), Ishii
Ebauches SA
Hickey Robert J.
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