| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the power loss of a switching element. SOLUTION: A control transformer PRT 1 is constituted by winding a control winding wire NC around two magnetic legs 21b and 21c, for example, among four magnetic legs of a three-dimensional core 20, which is formed by combining double U-shaped cores 21 and 22, and winding a resonance current detecting winding wire ND and a driving winding wire NB around two magnetic legs 22a and 22c at diagonal positions. Then, such a control transformer PRT 1 is used for the switching power source circuit.</p> |
