Temperature sensing circuit having a controller for...

Details Temperature sensing circuit having a controller for... Temperature sensing circuit having a controller for...

2008-06-10

2008-06-10

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Temperature control of photocell

C250S2140RC

Reexamination Certificate

active

07385182

ABSTRACT:
A temperature sensor includes a photodiode or other suitable light-sensitive device connected to a power source in a reverse bias configuration. A capacitor and a controller are connected to the photodiode. The controller measures the length of time required for the capacitor to charge to a predetermined voltage, and the known relationship between the dark current of the photodiode and the temperature is utilized to determine temperature. The controller resets the capacitor to zero volts, and repeats the charge/time measurement cycle.

REFERENCES:
patent: 3911298 (1975-10-01), Borsdorf et al.
patent: 4916307 (1990-04-01), Nishibe et al.
patent: 5650643 (1997-07-01), Kunoma
patent: 6359274 (2002-03-01), Nixon et al.
patent: 6918674 (2005-07-01), Drummond et al.

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