| 摘要 |
PROBLEM TO BE SOLVED: To obtain DC output with a voltage that differs from the output voltage of a secondary coil without increasing the loss. SOLUTION: A current that flows to a primary coil L1 is switched by a switching element Q1, and at the same time, a rectifying smoothing circuit 3 is connected to a secondary coil L2. In this case, a switching power supply is provided with a first inductor L5, where a current from the secondary coil L2 flows, and a first commutation element D3 for forming a current path for discharging energy accumulated in the first inductor L5.
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