| 主权项 |
1. A light emitting diode (LED) power supply for providing current to a plurality of LEDs, comprising:
a transformer comprising:
a first multilayer printed circuit board comprising a first plurality of planar windings electrically connected in series to form a first primary portion, each winding of said first plurality of planar windings being carried on a separate layer of said first multilayer printed circuit board;a second multilayer printed circuit board comprising a second plurality of planar windings electrically connected in series to form a second primary portion, each winding of said second plurality of planar windings being carried on a separate layer of said second multilayer printed circuit board;a third multilayer printed circuit board comprising a third planar winding carried on one layer to provide a secondary;said third multilayer printed circuit board comprising a first aperture on one side of said third planar winding, a second aperture on an opposite side of said third planar winding, and a central aperture surrounded by said third planar winding;said third multilayer printed circuit board comprising a top surface carrying said first multilayer printed circuit board and a bottom surface carrying said second multilayer printed circuit board, said first and second multilayer printed circuit boards being disposed such that said first primary portion, said second primary portion and said secondary are in vertical alignment with each other to maximize electromagnetic coupling;a first core consisting of a ferrite material and comprising first and second outer legs and a middle leg, said first core being carried on said first multilayer printed circuit board such that said middle leg extends therethrough in the middle of said first plurality of planar windings, and said first and second outer legs extend therethrough on opposite sides of said first plurality of planar windings;a second core consisting of said ferrite material and comprising first and second outer legs and a middle leg, said second core being carried on said second multilayer printed circuit board such that said middle leg extends therethrough in the middle of said second plurality of planar windings, and said first and second outer legs extend therethrough on opposite sides of said second plurality of planar windings;said first and said second outer legs of said first core extend into said third multilayer printed circuit board;said first and said second outer legs of said second core extend into said third multilayer printed circuit board and in physical engagement with said first and said second outer legs of said first core, respectively;said middle leg of said first core and said middle leg of said second core are disposed proximate to each other in alignment with said central aperture such that a predetermined air gap is provided there between; a first rectifier circuit carried on said third multilayer printed circuit board for rectifying alternating current (ac) from a power source; a driver circuit carried on said third multilayer printed circuit board and disposed between said first rectifier circuit and said first and second primary portions; and a second rectifier circuit carried on said third multilayer printed circuit board and coupled to said secondary and coupled to output power terminals to provide direct current for powering said plurality of LEDs. |
