Patent ID: 7499290
Filing Date: 2009-03-03
Classification: H02M,Y02B

Abstract:
1. A circuit comprising: a primary section comprising input terminals adapted to receive a DC input; a secondary section comprising a parallel capacitance resonance section and an inverting section comprising bi-directional switches; and a transformer coupling the primary and secondary sections, the transformer having a primary side and a secondary side; wherein the primary section comprises a plurality of transistors in an H-bridge configuration comprising a first group of transistors on a first side of the bridge and a second group of transistors on a second side of the bridge opposite the first side of the bridge; wherein the DC input is applied to the drain terminals of the first group of transistors; wherein the source terminals of the first group of transistors, the drain terminals of the second group of transistors and the primary side of the transformer are connected; wherein the source terminals of the second group of transistors are connected to form a return path for the current; and wherein the parallel capacitance resonance section is connected across the secondary side and is in resonance with a resonant inductance including a leakage inductance of the transformer and wherein a voltage across the parallel capacitance resonance section is discontinuous haversine waveform with alternating polarity.