| 摘要 |
PROBLEM TO BE SOLVED: To suppress the generation of an excessive surge voltage caused by an external noise or the like by a method wherein a suppression means which suppresses high-voltage pulses generated by a noise creeping from a commercial power supply is installed at a choke coil which constitutes a line filter. SOLUTION: In this switching power-supply apparatus, an active filter and a line filter are provided. Two round lands 10, 11 by which respective terminals of inphase lines of common-mode choke coils are connected to wiring patterns on a printed-circuit board P are arranged so as to be separated from each other, and a discharging gap is constituted. At this time, a slit 12 is formed between the round lands 10, 11, protrusion parts 10a, 11a are formed, and constriction parts 13 are formed in pattern parts of connection lines. As a result, the generation of an excessive surge voltage caused by an external noise is suppressed. When a continuous discharge is generated in the discharging gap, the wiring partters are fused in the constriction parts 13, and it is possible to prevent a continuous discharge.
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