Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/4735
Title: HID ballast with integrated voltage multiplier and lamp temperature compensation
Authors: Cheng, K. W. Eric
Divakar, B. P.
Wang, Daohong
Cheung, C. Norbert
Issue Date: 20-Dec-2011
Source: US Patent 8,080,949 B2. Washington, DC: US Patent and Trademark Office, 2011.
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.
Rights: Assignee: The Hong Kong Polytechnic University.
Type: Patent
URI: http://hdl.handle.net/10397/4735
Appears in Collections:Patents of PolyU
EE Patents

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