| 摘要 |
PROBLEM TO BE SOLVED: To provide a switching power supply circuit employing a polarity inversion DC-DC converter which can suppress noise terminal voltage while minimizing cost increase or degradation of efficiency using a small number of components not including a large line filter. SOLUTION: In the switching power supply circuit employing a polarity inversion DC-DC converter 3 having a choke coil L2 in series with a switching element Q1 and equipped with a control circuit 4 and a rectification D1/smoothing circuit C3, a series connection of a diode D2 and a resistor R1 is connected across the choke coil L2 in parallel therewith. COPYRIGHT: (C)2007,JPO&INPIT
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