Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1992-02-18
1993-12-14
Stephan, Steven L.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
323222, 323299, 323906, H02J 700, G05F 1613
Patent
active
052706362
ABSTRACT:
A regulating circuit controls current flow from a photovoltaic power source (20) to a storage battery (38) to improve the conversion of solar energy to electric energy. Two transistors (22, 30) are switched on and off at high frequency to regulate the average current flow to the battery. A pulse-width-modulator control chip (42) varies the on-time of each transistor independently to provide separate control of source voltage and circuit output voltage. The source is regulated to produce maximum power and the output voltage is regulated to provide an optimum battery charging voltage. The maximum available energy is transferred from the source to the battery, thereby improving the conversion efficiency of the system.
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Dunlop, J. et al., "Performance of Battery Charge Controllers: First Year Test Report", Proc. 22nd IEEE PV Conf., Las Vegas, Nev., 640 (1991).
Dougherty Thomas M.
Stephan Steven L.
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