| 摘要 |
PROBLEM TO BE SOLVED: To easily perform overcurrent protection in a switching power device. SOLUTION: In a spool 12 for a transformer for forming a current resonance type switching power device, a first groove 21, a second groove 22, a third groove 23, and a fourth groove 24 are formed. In the first, second, and third grooves 21, 22, 23, a primary winding N1, a secondary winding N2, and a tertiary winding N3 are arranged. The tertiary winding N3 is arranged between the primary winding N1 and the secondary winding N2.
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