| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a zero voltage switching type switching power supply device that reduces an effect of resonance generated by an inductance on a primary side and a capacitance component on a secondary side.SOLUTION: In a switching power supply device 100, a first protection diode D1 is connected between a first junction of a first resonant inductor L1 on a primary side and one terminal of a primary winding of a transformer T1, and a power line on a high voltage side of a DC power supply E. A second protection diode D2 is connected between the first junction and a power line on a low voltage side of the DC power supply E. A third protection diode D3 is connected between a second junction of a second resonant inductor L2 and the other terminal of the primary winding, and the power line on the high voltage side of the DC power supply E. A fourth protection diode D4 is connected between the second junction and the power line on the low voltage side of the DC power supply E.</p> |
