Patent ID: 8581501
Filing Date: 2013-11-12
Classification: H05B

Abstract:
1. A dimming ballast for operating a plurality of lamps, comprising: a DC power source operative to provide DC electrical power; a DC-AC converter coupled to receive the DC electrical power from the DC power source and operative to provide an AC output to drive a plurality of lamps; a controller operatively coupled with the DC-AC converter to control power applied to the lamps, the controller being operative at least partially according to a dimming level setpoint to selectively dim at most one of the lamps while controlling all the remaining lamps to be substantially at 0% or 100% power; wherein the controller is operative to selectively dim only a predetermined one of the plurality of lamps while controlling all the remaining lamps to be substantially at 0% or 100% power at least partially according to the dimming level setpoint; and wherein the DC-AC converter comprises: