Ballast and igniter for a lamp having larger storage...

Details Ballast and igniter for a lamp having larger storage... Ballast and igniter for a lamp having larger storage...

2007-11-06

2007-11-06

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S2090SC, C315S2090SC, C315S276000, C361S257000, C361S256000, C361S253000

Reexamination Certificate

active

11713602

ABSTRACT:
A ballast according to the present invention operates in an ignition state, a warm-up state, and a steady state for igniting and powering a lamp. The ballast comprises an igniter that ignites the lamp during the ignition state and a switching power inverter, for example, a full bridge DC-AC inverter implemented with MOSFET switching transistors, that powers the lamp during the warm-up and steady states. The switching power inverter, which drives the igniter, operates at a first switching frequency during the ignition state and operates at a second switching frequency during the steady state. Preferably, the first switching frequency, which in one exemplary embodiment is in the kHz range, is higher than the second switching frequency.

REFERENCES:
patent: 6188180 (2001-02-01), Diamond
patent: 6437518 (2002-08-01), Ito et al.
patent: 6624585 (2003-09-01), Pruett
patent: 2004/0113569 (2004-06-01), Henry
patent: 2004/0130273 (2004-07-01), Alexandrov
patent: 2004/0251849 (2004-12-01), Harada et al.
patent: 2005/0110431 (2005-05-01), Ben-Yaakov
Kyu-Chan, et al., “Design and Analysis High Intensity Discharge Lamp Ballast Using Micro Controller Unit”, IEEE Transactions on Power Electronics, pp. 1356-1364, vol. 18, No. 6, Nov. 2003.

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