Patent ID: 9030119
Filing Date: 2015-05-12
Classification: H05B

Abstract:
1. A solid state lighting driver arrangement comprising: a bridge converter comprising a power transformer, a plurality of electronically controlled switches and a capacitor, the capacitor arranged in cooperation with the plurality of electronically controlled switches so as to prevent the flow of a steady state direct current through the primary winding of the power transformer, the bridge converter arranged to receive an input direct current voltage potential and provide an alternating current output across a secondary winding of the power transformer; a plurality of light emitting diode (LED) strings, a first end of each of the plurality of LED strings coupled to the center tap of said secondary winding of said power transformer; and a balancer transformer with a pair of magnetically coupled center tapped windings, a second end of each of the plurality of LED strings coupled to a respective end of one of the first and second windings of said balancer transformer such that power on each half cycle output by the bridge converter is balanced between the LED strings receiving power during that half cycle by said respective balancer transform winding, and that power between the half cycles output by the bridge converter is balanced between the LED strings receiving power during each half cycle by said balancer transformer, a first end of the secondary winding of the power transformer coupled to the center tap of the first winding of said balancer transformer and a second end of the secondary winding of the power transformer coupled to the center tap of the second winding of said balancer transformer.