Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1983-11-17
1985-12-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
126425, G01J 120
Patent
active
045567883
ABSTRACT:
An array of an even number of amorphous silicon solar cells are serially connected between first and second terminals of opposite polarity. The terminals are connected to one input terminal of a DC motor whose other input terminal is connected to the mid-cell of the serial array. Vane elements are adjacent the end cells to selectively shadow one or the other of the end cells when the array is oriented from a desired attitude relative to the sun. The shadowing of one cell of a group of cells on one side of the mid-cell reduces the power of that group substantially so that full power from the group of cells on the other side of the mid-cell drives the motor to reorient the array to the desired attitude. The cell groups each have a full power output at the power rating of the motor. When the array is at the desired attitude the power output of the two groups of cells balances due to their opposite polarity so that the motor remains unpowered.
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"Monolithic Solar Cell Panel of Amorphous Silicon," by J. J. Hanak, Solar Energy, vol. 23, 1979, pp. 145-147.
"Industrialization of a--Si Photovoltaic Cells," by Yukinori Kuwano et al., Solar Energy Research Institute, Amorphous Silicon Material Meeting, Atlantic City, Nov. 23-25, 1981.
Haas George E.
Nelms David C.
RCA Corporation
Squire William
Tripoli Joseph S.
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