Patent ID: 9325247
Filing Date: 2016-04-26
CPC Classification: H02M,Y02B

Claim Text:
1. A method of converting power between an input source and a load, where the load may vary over a normal operating range, comprising: providing a transformer; forming a resonant circuit including the transformer and a resonant capacitor and having a characteristic resonant frequency and period; providing output circuitry connected to the transformer for delivering a rectified output voltage to the load; providing two or more primary switches to drive the resonant circuit; providing a clamp switch to clamp the resonant capacitor; providing a switch controller to operate the primary switches and the clamp switch in a series of converter operating cycles, each converter operating cycle characterized by: (a) two power transfer intervals of essentially equal duration during which one or more of the primary switches are ON, a magnetizing current flows in a winding of the transformer, and power is transferred between the input and the output via the transformer, each power transfer interval comprising: