| 摘要 |
The present invention aims to obtain a stable output voltage without requiring an extra circuit by suppressing influence of noise of the primary winding and voltage induction by leakage inductance. In a transformer 3 used in a multi-output switching power supply, a secondary winding S 1 for outputting a voltage to be fed back to the primary side out of the secondary windings S 2 to Sn winded on a bobbin 3 a is divided into a first layer S 1 a and a second layer S 1 b, a secondary winding S 2 to Sn for outputting a voltage not fed back to the primary side is winded between the first layer S 1 a and the second layer S 1 b, and the first layer S 1 a and the second layer S 1 b is regular winded.
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