Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Anil P. Ghode0
Martin S. Scolaro0
Date of Patent
May 13, 2008
0Patent Application Number
106770770
Date Filed
October 1, 2003
0Patent Primary Examiner
Patent abstract
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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