Electricity: power supply or regulation systems – In shunt with source or load – Using diode
Patent
1988-08-03
1989-10-10
Wong, Peter S.
Electricity: power supply or regulation systems
In shunt with source or load
Using diode
323906, 136293, G05F 500
Patent
active
048734802
ABSTRACT:
A switching network for improving the conversion efficiency of a photovoltaic power supply comprises a variable coupling circuit for coupling an array of photovoltaic cells to a load resistance. The combined effective impedance of the network and load is varied to match the value required for maximum output power. A switching transistor (22) which connects the source module (20) to the load (30) is pulse-width modulated with a variable duty cycle determined by the control signal from the sensor circuit. A photovoltaic cell (32) similar to those comprising the photovoltaic power module (20) is used to track variations in the ambient light intensity. The open-circuit voltage of a sensor cell (32) is used to determine the proper value of duty cycle required for maximum power transfer. The output voltage of the module (20) is sampled and compared with the proper value to produce a control signal.
REFERENCES:
patent: 3384806 (1968-05-01), Hartman
patent: 4468569 (1984-08-01), Norris
patent: 4556838 (1985-12-01), Brasseur
patent: 4695785 (1987-09-01), Mieth et al.
patent: 4728878 (1988-03-01), Anthony
patent: 4742291 (1988-05-01), Bobier et al.
Sterrett Jeffrey
Wong Peter S.
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