Patent ID: 6208528
Filing Date: 2001-03-27
Classification: H01F,H02H

Abstract:
A power supply having at least one voltage output, said power supply comprising:a pulse width modulator subcircuit to be powered by a direct current source voltage at an input for generating at an output a first modulated signal; anda planar transformer having a primary side and a secondary side, the primary side being coupled to the output of the pulse width modulator subcircuit, the planar transformer including:a primary winding and a secondary winding, each of said windings having first and second terminal connectors, wherein one of either the primary or secondary winding is a planar multi-turn winding having a plurality of planar loops in overlying registration to one another, and the other of either said primary or secondary winding is a planar single-turn winding having a single loop in overlying registration with the plurality of loops of said multi-turn winding, wherein the multi-turn winding includes a folded self-supporting blank formed from conductive sheet material, said blank defining a continuous conductive path, first and second terminal ends, and at least three loops disposed along the path, each of said loops defining a respective turn of a winding, said blank being folded at preselected folding locations on the path to thereby position each of said loops defining a respective turn of a winding in a respective plane to define the planar multi-turn winding;an inductive core magnetically coupled to the primary and secondary windings to form a closed magnetic loop;means for electrically insulating the loops of the primary and secondary windings from one another and from the inductive core; anda rectifier subcircuit having an input coupled to the secondary side of the transformer for receiving and rectifying a second signal electromagnetically induced from the first signal to form a first regulated output voltage.