| 摘要 |
There is provided a synchronous rectifier circuit that makes it possible to secure sufficient driving voltage for the rectifier switch regardless of the voltage of the secondary winding; in this synchronous rectifier circuit the primary winding (T1) is insulated from the secondary winding (T2), and a rectifier switch (SW2) is provided on the secondary side, an auxiliary switch (Q), a diode (D), and an auxiliary winding (T3) are also provided on the secondary side; the emitter of the auxiliary switch (Q) and the cathode of the diode (D) are connected to the gate of the rectifier switch (SW2), one end of the auxiliary winding (T3) is connected to the base of the auxiliary switch (Q) and the anode of the diode (D), an end of the secondary winding is connected to the collector of the auxiliary switch (Q), and the other end of the auxiliary winding is connected to the one end of the secondary winding (T2). <IMAGE> |
