Method and apparatus for lamp heat control

Details Method and apparatus for lamp heat control Method and apparatus for lamp heat control

H - Electricity

05

B

H05B 37/02 (2006.01) F21L 4/00 (2006.01) F21V 25/10 (2006.01) G05B 11/28 (2006.01) H05B 41/36 (2006.01)

Patent

CA 2457292

A lamp drive circuit includes an electronic switch in series with the lamp and a source of DC voltage, a control input of the switch being pulse-width- modulated by a control circuit which includes a temperature-sensing circuit for reducing the pulse-width-modulation duty cycle when lamp temperature exceeds a predetermined temperature. The temperature-sensing circuit may include a thermal switch in series with one of two parallel-connected resistors in a timing circuit. Duty cycle may also be automatically adjusted in response to changes in the source voltage.

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