Patent ID: 8391035

Claim:
An integrated-type high step-up ratio DC-AC conversion circuit with an auxiliary step-up circuit, comprising: a DC input unit providing a DC voltage; an isolated Cuk integration unit converting the DC voltage into a high DC voltage and further comprising a first high-frequency transformer connected with the DC input unit and a first capacitor connected with the first high-frequency transformer, and the first capacitor stores power coming from the first high-frequency transformer; an auxiliary step-up unit connected with the isolated Cuk integration unit in parallel and further comprising a second high-frequency transformer connected with the DC input unit and a second capacitor connected with the second high-frequency transformer and the first capacitor, and second capacitor stores power coming from the second high-frequency transformer; and an AC output unit converting the high DC voltage into an AC voltage, connected with the first capacitor and the second capacitor, and outputting the AC voltage.