Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2009-03-09
2011-12-20
Philogene, Haiss (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S307000, C315S291000, C315S224000, C323S242000, C323S288000
Reexamination Certificate
active
08080949
ABSTRACT:
The present invention relates to temperature compensation of HID lamps in automobiles. The invention concerns the manner in which the temperature of the HID lamp is accounted for in order to drive the lamp is at appropriate power from hot to cold conditions. In the present invention, the voltage across a capacitor in the temperature compensation circuit is sensed and used as a command signal to anticipate lamp temperature, and accordingly the reference power to the HID lamp is modulated depending on the temperature of the lamp. In the present invention, the lamp is driven with a higher power setting when the lamp is cold and with lower power setting when hot. This adaptive generation of reference power setting depending on the temperature of the lamp is implemented using the voltage across a capacitor in the temperature compensation circuit.
REFERENCES:
patent: 4914356 (1990-04-01), Cockram
patent: 7187136 (2007-03-01), Fiorello
patent: 7221107 (2007-05-01), Melis
patent: 7911148 (2011-03-01), Fischer et al.
Ron Fiorello, Power A 35W DC Metal Halide High Intensity Discharge (HID) Lamp Using the UCC3305 HID Lamp Controller, May 17, 1996.
Lee and Cho: Design and Analysis of Automotive High Intensity Discharge Lamp Ballast Using Micro Controller Unit, IEEE Transactions on Power Electronics, vol. 18, No. 6, Nov. 2003.
Cheng Ka Wai Eric
Cheung Chow Norbert
Divakar Bangalore Prabhakar
Wang Dao Hong
Philogene Haiss
The Hong Kong Polytechnic University
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