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Temperature compensated photovoltaic array

United States Patent

*** EXPIRED ***
November 18, 1997
View the Complete Patent at the US Patent & Trademark Office
A temperature compensated photovoltaic module (20) comprised of a series of solar cells (22) having a thermally activated switch (24) connected in parallel with several of the cells (22). The photovoltaic module (20) is adapted to charge conventional batteries having a temperature coefficient (TC) differing from the temperature coefficient (TC) of the module (20). The calibration temperatures of the switches (24) are chosen whereby the colder the ambient temperature for the module (20), the more switches that are on and form a closed circuit to short the associated solar cells (22). By shorting some of the solar cells (22) as the ambient temperature decreases, the battery being charged by the module (20) is not excessively overcharged at lower temperatures. PV module (20) is an integrated solution that is reliable and inexpensive.
Mosher; Dan Michael (Plano, TX)
Texas Instruments Incorporated (Dallas, TX)
08/ 565,428
November 30, 1995
The government of the United States of America has rights in this invention pursuant to Subcontract No. ZAI-4-11294-04 awarded by the U.S. Department of Energy.