Patent ID: 7675243

Claim:
A two-end driven lamp controlling device comprising: a DC power supply, for outputting DC power to a square wave switch; the square wave switch, for receiving the DC power from the DC power supply, converting the DC power into AC power and then outputting the AC power to a plurality of starting transformers and a commonly connective transformer; a square wave controller, for outputting control signals to the square wave switch; a plurality of lamps, each lamp having an independent end and a commonly connective end for which voltage phases are reverse to each other, wherein the commonly connective ends of the lamps are commonly connected to a point that is further connected to at least one set of secondary coil of the commonly connective transformer while the independent ends of the lamps are connected to at least one set of secondary coil of a corresponding one of the plurality of starting transformers; each starting transformer, having at least one set of primary coil and the at least one set of secondary coil, each set having two ends, wherein the at least one set of primary coil receives power signals from the square wave switch while the at least one set of secondary coil, after voltage raising, has one end connected to the independent end of the corresponding one of the plurality of lamps and the other one end connected to a reference ground level; and the commonly connective transformer, having at least one set of primary coil and the at least one set of secondary coil, each set having two ends, wherein the at least one set of primary coil receives power signals from the square wave switch while the at least one set of secondary coil, after voltage raising, has one end connected to the point that is further connected the commonly connective ends of the plurality of lamps and the other one end connected to a reference ground level.