ASYMMETRY FLYBACK CONVERTER

摘要

PURPOSE: An asymmetry flyback converter is provided to prevent the heat generation of a control unit and reduce the size of a transformer by realizing a switch performing a zero voltage switching and minimizing the switching noise of a rectifier diode. CONSTITUTION: A first delay unit(51) delays an output signal of a control unit(40) for a predetermined time and outputs the delayed output signal. A first comparing unit(52) compares the delayed output signal from the first delay unit(51) with a reference signal(Vref1) and outputs a signal having a level higher than the level of reference signal. A first buffer unit(53) buffers the delayed output signal of the first delay unit(51). An insulating unit(54) insulates the buffered output signal from the first buffer unit(53) against a first field effect transistor(Q1). A second delay unit(55) delays the output signal of a control unit(40) for a predetermined time and outputs the delayed output signal. A second comparing unit(56) compares the delayed output signal from the second delay unit(55) with a reference signal(Vref2) and outputs a signal having a level lower than the level of reference signal. A second buffer unit(57) buffers the output signal from the second comparing unit(56) and applies the buffered output signal to the gate of a second field effect transistor(Q2).