Invention Grant
US08080949B2 HID ballast with integrated voltage multiplier and lamp temperature compensation
有权
HID镇流器具有集成的电压倍增器和灯温度补偿
- Patent Title: HID ballast with integrated voltage multiplier and lamp temperature compensation
- Patent Title (中): HID镇流器具有集成的电压倍增器和灯温度补偿
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Application No.: US12382081Application Date: 2009-03-09
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Publication No.: US08080949B2Publication Date: 2011-12-20
- Inventor: Ka Wai Eric Cheng , Bangalore Prabhakar Divakar , Dao Hong Wang , Chow Norbert Cheung
- Applicant: Ka Wai Eric Cheng , Bangalore Prabhakar Divakar , Dao Hong Wang , Chow Norbert Cheung
- Applicant Address: HK Hung Hom, Kowloon
- Assignee: The Hong Kong Polytechnic University
- Current Assignee: The Hong Kong Polytechnic University
- Current Assignee Address: HK Hung Hom, Kowloon
- Main IPC: G05F1/00
- IPC: G05F1/00
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.
Public/Granted literature
- US20090251076A1 HID ballast with integrated voltage multiplier and lamp temperature compensation Public/Granted day:2009-10-08
Information query
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