| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a current push-pull type switching power supply that self-oscillates in a simple configuration, and a lighting device. <P>SOLUTION: A switching power supply 2 provided includes a transformer 4, a resonant capacitor 8, a pair of switching elements 10, 11, an inductor 9 and rectifying elements 16, 17. The transformer 4 has a primary winding 5, a secondary winding 6 and a tertiary winding 7. The resonant capacitor 8 is connected to both ends of the primary winding 5. The pair of switching elements 10, 11 are normally-on elements each having a first main terminal, a second main terminal and a control terminal. The first main terminal of one switching element 10 is connected to the first main terminal of the other switching element 11. The second main terminal of the one switching element 10 is connected to one end of the primary winding 5, and the second main terminal of the other switching element 11 is connected to the other end of the primary winding 5. <P>COPYRIGHT: (C)2013,JPO&INPIT |
