Aggregate ignition method in high frequency metal halide lamps

Details Aggregate ignition method in high frequency metal halide lamps Aggregate ignition method in high frequency metal halide lamps

2011-04-05

2011-04-05

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S246000, C315S283000, C315S299000, C315S307000, C315S360000

Reexamination Certificate

active

07919926

ABSTRACT:
A high frequency ballast for a metal halide lamp comprises a controller, a switch, and an oscillator. The controller selectively enables and disables the oscillator via the switch to ignite the lamp. The ignition method includes enabling the oscillator such that the oscillator provides the lamp with a pulse train comprising a rapid series of short ignition pulses, cools for a period of time, and provides an addition pulse train to the lamp if necessary to ignite the lamp. When the lamp ignites, the ballast maintains enablement of the oscillator.

REFERENCES:
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patent: 6404140 (2002-06-01), Nerone
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patent: 6479949 (2002-11-01), Nerone et al.
patent: 6819057 (2004-11-01), Alexandrov
Lin et al., “2.65 MHz Self-oscillating Electronic Ballast with Constant Lamp-Current Control for Metal Halide Lamp”, 37th IEEE Power Electronics Specialists Conference, Jun. 18, 2006, 6 pgs.

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