Ballast with zero voltage switching converter

Details Ballast with zero voltage switching converter Ballast with zero voltage switching converter

2008-07-22

2008-07-22

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

C315S246000, C315S291000

Reexamination Certificate

active

11660789

ABSTRACT:
A ballast (10) for powering at least one gas discharge lamp (20) comprises a switching converter (100) and an inverter (900). Switching converter (100) includes a transistor (130) and a control circuit (200) that provides substantially zero voltage switching of the transistor (130) at a very high frequency. Preferably, control circuit (200) includes a drive circuit (300), a turn-on synchronization circuit (400), a current mirror circuit (500), a rail voltage regulator circuit (600), and a lamp current regulator circuit (700). Drive circuit (300) is preferably realized by a circuit arrangement that includes a standard pulse-width modulation integrated circuit (310).

REFERENCES:
patent: 6057652 (2000-05-01), Chen et al.
patent: 6300725 (2001-10-01), Zinkler et al.
patent: 6469454 (2002-10-01), Mader et al.
patent: 6548966 (2003-04-01), Kawasaka et al.
patent: 6826063 (2004-11-01), Ichikawa et al.
patent: 7095183 (2006-08-01), Alexandrov
patent: 2005/0225257 (2005-10-01), Green
patent: 2006/0006812 (2006-01-01), Alexandrov

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