| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a switching power supply apparatus that reduces conduction loss in windings and is downsized in its entirety. <P>SOLUTION: A rectifying device 13 that smooths an output voltage Vout into a direct current is connected in reverse bias to a direct-current power supply 11 via a switching element 12. The switching element 12 is connected between a positive terminal of the direct-current power supply 11 and a cathode terminal of the rectifying device 13 and interrupts a current from the direct-current power supply 11. One end of an induction element 16a is connected to the connection of the switching element 12 and the rectifying device 13. A capacitative element 17 is connected between the other end of the induction element 16a and a negative terminal of the direct-current power supply 11. The output voltage Vout between both ends of the capacitative elements 17 is provided to a load not shown. An auxiliary winding 16b is magnetically coupled to the induction element 16a, and a clamp element 15 is connected in series to the auxiliary winding 16b. A current according to a surge voltage generating at the rectifying device 13 is passed from the clamp element 15 to the direct-current power supply 11 via the auxiliary winding 16b. <P>COPYRIGHT: (C)2013,JPO&INPIT |
