Ballast circuit for operating a gas discharge lamp

Details Ballast circuit for operating a gas discharge lamp Ballast circuit for operating a gas discharge lamp

2007-09-18

2007-09-18

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S291000, C315SDIG002

Reexamination Certificate

active

10520867

ABSTRACT:
Ballast circuit for operating a gas discharge lamp, comprising a half-bridge DC-AC converter having a voltage controlled oscillator (VCO) for alternately switching the switches (T1; T2) of said half-bridge, said oscillator (VCO) having an input with a control voltage (V vco) which determines the operating frequency of said half-bridge, a resonance circuit connected to said half-bridge for feeding the lamp, and a feedback circuit connected at a first end to said resonance circuit for adjusting the operating frequency of said half-bridge, wherein the other end of said feedback circuit is connected to the input of said voltage controlled oscillator (VCO) and designed such that during at least a substantial part of the start-up period of the lamp an equilibrium exists wherein the half-bridge frequency is at least nearly equal to the resonance frequency and the half-bridge voltage is forced to operate at least nearly in phase with the half-bridge current.

REFERENCES:
patent: 4277728 (1981-07-01), Stevens
patent: 5233273 (1993-08-01), Waki et al.
patent: 5825136 (1998-10-01), Rudolph
patent: 6137240 (2000-10-01), Bogdan
patent: 6160362 (2000-12-01), Shone et al.
patent: 6541923 (2003-04-01), Tyson
patent: 6747421 (2004-06-01), Kohn
patent: 6794828 (2004-09-01), Tyson
patent: 2001/0035721 (2001-11-01), Halberstadt

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