Patent ID: 8331114

Claim:
A flyback power converter, comprising: a first transformer, for energy transfer; a high-side transistor and a low-side transistor, coupled to switch said first transformer; two diodes, coupled to said first transformer to circulate energy of a leakage inductance of said first transformer to an input power rail of said flyback power converter; a first control circuit, generating a first switching signal to control said high-side transistor and said low-side transistor; a high-side driving circuit, coupled to receive said first switching signal for driving said high-side transistor; and a second control circuit and a second transformer, generating a floating voltage to power said high-side driving circuit, wherein said second control circuit generates a second switching signal, and said second switching signal switches said second transformer for generating an auxiliary voltage to power said first control circuit, said second control circuit, and said high-side driving circuit.