High efficiency resonant ballast

Details High efficiency resonant ballast High efficiency resonant ballast

2006-12-07

2009-11-10

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S219000, C315S309000, C315SDIG002

Reexamination Certificate

active

07615934

ABSTRACT:
The present invention provides a low-cost ballast circuit for fluorescent lamps. A resonant circuit has a transformer to operate the fluorescent lamp. The fluorescent lamp is connected in series with a first winding of the transformer. A first transistor and a second transistor are coupled to switch the resonant circuit. A second winding and a third winding of the transformer are used for generating control signals in response to a switching current of the resonant circuit. Furthermore, the present invention achieves soft operation for the first transistor and the second transistor.

REFERENCES:
patent: 7084580 (2006-08-01), Muramatsu et al.
patent: 7436126 (2008-10-01), Yang

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