OUTPUT NOISE REDUCING DEVICE

摘要

One end of a bus bar 11 (output line) for leading an output voltage output from a switching power supply 5 to the outside is a connection terminal connected to an output end associated with the switching power supply 5 (electronic equipment), while the other end is an output terminal VO. A ferrite core 17 (magnetic material core) has a through-hole through which the bus bar 11 is disposed. Electromagnetic coupling from the switching power supply 5 is suppressed between the output terminal VO of the bus bar 11 and at least a part of the ferrite core 17 on the output terminal VO side along the bus bar 11. In this way, electromagnetic coupling of a part of a choke coil L1 including the ferrite core 17 with the bus bar 11 penetrating therethrough on the output terminal VO side and the switching power supply 5 is suppressed, whereby propagation of noise to the output terminal VO is suppressed. Thus, an output noise reducing device capable of preventing the propagation of noise from the electronic equipment housed in a metal casing by electromagnetic coupling can be provided.