Patent ID: 8779686
Filing Date: 2014-07-15
Classification: H05B

Abstract:
1. A light emitting diode (LED) based luminaire driving arrangement comprising: a switched power conversion stage having a power transformer with a primary and at least one secondary winding, the switched power conversion stage arranged to produce a predetermined voltage across the secondary winding; a plurality of LED based luminaries arranged to receive power in parallel from said at least one secondary winding of said switched power conversion stage; a balancer constituted of a plurality of balancing transformers, each of said plurality of balancing transformers exhibiting a first winding and a second winding magnetically coupled to said first winding, said first winding of each of said balancing transformers connected in series with a particular one of the plurality of LED based luminaries and said second windings of said plurality of balancing transformers connected in a closed serial loop; an electronically controlled switch in series with said plurality of parallel LED based luminaries and arranged to alternatively pass current through said plurality of parallel LED based luminaries when closed and prevent the flow of current through said plurality of parallel LED based luminaries when opened; and a synchronous driver in communication with said electronically controlled switch, said synchronous driver arranged to close said electronically controlled switch only when said switched power conversion stage is actively supplying power via said at least one secondary winding and further comprising a plurality of capacitors, each of said plurality of capacitors switch-ably connected in parallel with a particular one of the plurality of parallel LED based luminaries LEDs.