Multi-phase input dimming ballast with flyback converter and...

Details Multi-phase input dimming ballast with flyback converter and... Multi-phase input dimming ballast with flyback converter and...

2007-06-12

2007-06-12

Vu, David (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

C315S224000, C315SDIG002

Reexamination Certificate

active

11118634

ABSTRACT:
An apparatus and method for powering a lamp connected to a ballast circuit. The ballast circuit is connected to a first alternating current (AC) source having a first phase and to a second AC source having a second phase. A first rectifier circuit is connected between the first AC source and a first switching circuit. A second rectifier circuit is connected between the second AC source and a first switching circuit. A control circuit selectively energizes the first and second switching circuits to provide power from the first and second AC sources to the lamp load via an inverter circuit. A detection circuit generates a detection signal indicating whether power is being supplied by each the first and second AC sources. The detection signal is provided to a dimming regulation circuit to generate a dim level command signal for dimming the lamp.

REFERENCES:
patent: 6534931 (2003-03-01), Konopka et al.
patent: 2005/0062436 (2005-03-01), Jin

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