| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a smaller and more efficient switching power supply 10. <P>SOLUTION: The switching power supply 10 is provided with a high frequency transformer 40, a primary switching circuit 30 generating prescribed voltage in a secondary winding 42 and an auxiliary winding 43 of the high frequency transformer 40 by switching current flowing in a primary winging 41 of the high frequency transformer 40, a secondary rectifier circuit 50 rectifying voltage generated in the secondary winding 42 of the high frequency transformer 40 and supplying it to a load, a charging circuit 60 charging a secondary battery 70 with constant current by rectifying and switching current flowing in the auxiliary winding 43 of the high frequency transformer 40, and the switch 80 disposed between the secondary battery 70 and the load. When voltage supplied to the load is interrupted, voltage of the secondary battery 70 is supplied to the load without making it pass through the high frequency transformer 40. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
