Patent ID: 8610416

Claim:
A self-driven synchronous rectification boost converter, wherein the self-driven synchronous rectification boost converter comprises: a first switch receiving a pulse driving signal and being repeatedly switched on/off according to the pulse driving signal; a first winding connected between an input voltage source and the first switch, storing energy when the first switch is switched on and releasing energy when the first switch is switched off; an auxiliary winding connected to the first winding and the first switch; a second switch; and a switch circuit connected to the auxiliary winding and having a diode and a third switch, and the anode of the diode is connected to a terminal of the auxiliary winding; the third switch is connected to the cathode of the diode and the second switch, and when the terminal voltage of the auxiliary winding is a forward voltage, the diode is in an on state, the third switch is in an off state, the second switch is in an on state; when the terminal voltage of the auxiliary winding is a reverse voltage, the diode is in an off state, and the third switch is in an on state, the second switch is in an off state.