Patent ID: 7254048

Claim:
A method to output a regulated voltage from a power converter, comprising: directly receiving a DC input voltage at a center tap of a secondary winding of the transformer, the transformer being coupled to a first switching device and also including a primary winding, the center tap of the transformer separating the secondary winding of the transformer into a first autowinding and a second autowinding; charging a first capacitor to a first DC voltage corresponding to the DC input voltage by coupling the DC input voltage across the first capacitor; charging a second capacitor to a second DC voltage corresponding to the DC input voltage by utilizing a control circuit and second switching devices to control the first autowinding and the second autowinding of the transformer to apply the second voltage across the second capacitor; and adding at a first node, the first DC voltage and the second DC voltage to generate a third DC voltage, wherein the first switching device and the second switching devices are driven by signals operating at a common frequency.