Current-mode resonant ballast

Details Current-mode resonant ballast Current-mode resonant ballast

2008-05-06

2008-05-06

Vu, David H. (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S224000, C315SDIG002, C315SDIG002

Reexamination Certificate

active

11535988

ABSTRACT:
A lower-cost ballast circuit for fluorescent lamps is provided. A resonant circuit is formed by a series connection of an inductor and a capacitor to operate the fluorescent lamp. A first circuit and a second circuit are coupled to switch the resonant circuit. Taking the first circuit for instance, a first resistor is connected in series with a first switch for generating a first control signal in response to a switching current of the first switch. The first switch is turned on once the first control signal is lower than a first zero-threshold. After a quarter resonant period of the resonant circuit, the first switch is turned off once the first control signal is lower than a first threshold. Therefore, a soft switching for the first switch is achieved.

REFERENCES:
patent: 5449979 (1995-09-01), Ueoka et al.
patent: 5977725 (1999-11-01), Miyazaki et al.

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