Ballast apparatus and ballasting method of high intensity...

Details Ballast apparatus and ballasting method of high intensity... Ballast apparatus and ballasting method of high intensity...

2006-04-04

2006-04-04

Dinh, Trinh V (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S291000, C315S224000

Reexamination Certificate

active

07023143

ABSTRACT:
A ballast for a vehicle metal halide lamp is simplified using a DC-AC one-step-boost high frequency ballast system. To satisfy requirements specific to a metal halide lamp, a discharge developing capacitor is installed on a primary side of a transformer in parallel with a DC power supply, ensuring discharge development after a breakdown. To reduce the size and increase the operating voltage of the transformer, a booster circuit and voltage-doubler circuit are installed on the primary side and secondary side of the transformer, respectively. To reduce the size of the transformer and achieve a stable discharge, the ballast frequency is swept within a range between the specified minimum frequency and maximum frequency so that the center frequency is from 80 kHz to 120 kHz, and the same frequency is unsustained for more than 10 msec.

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Yoshikawa et al., “New Method for Reducing Arc Instability of HID Lamps on High Frequency Operation”,J. Illum. Engng. Inst. Jpn,, 1993, vol. 77, No. 10, pp. 619-626.

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