Circuit for powering a high intensity discharge lamp

Details Circuit for powering a high intensity discharge lamp Circuit for powering a high intensity discharge lamp

2006-09-29

2008-10-07

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S291000, C315S221000

Reexamination Certificate

active

07432664

ABSTRACT:
A circuit (200) for powering a high intensity discharge lamp (10) comprises first and second input terminals (202,204), first and second output terminal (206,208), first and second inverter switches (SW1,SW2), a transformer (240), first and second buck capacitors (CBUCK1,CBUCK2), first and second low-side capacitors (CLOWSIDE1,CLOWSIDE2), an ignitor (216), and a diode subcircuit (250,260). Transformer (240) includes a primary winding (242) and a secondary winding (244). During operation of circuit200, primary winding (242) functions as a buck inductor, while secondary winding (244) operates in conjunction with diode subcircuit (250,260) to provide enhanced low frequency open circuit voltage (OCV) during the lamp starting phase and during steady-state powering of the lamp (10). Circuit (200) also allows for a lamp current having a non-zero average value. Circuit (200) is realizable with first and second low-side capacitors (CLOWSIDE1,CLOWSIDE2) having a relatively low capacitance value.

REFERENCES:
patent: 5642065 (1997-06-01), Choi et al.
patent: 6008591 (1999-12-01), Huber et al.
patent: 6362576 (2002-03-01), Huber et al.
patent: 7145293 (2006-12-01), Braun et al.
patent: 2005/0225260 (2005-10-01), Braun et al.
patent: 2005/0269963 (2005-12-01), Komatsu et al.
patent: 2006/0113924 (2006-06-01), Van Casteren

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