| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a switching power supply device that is compact, that can be assembled easily, and that can reduce unnecessary parasitic inductance components and a loss on a transformer and a secondary winding side. <P>SOLUTION: A transformer 22 has a plurality of secondary windings 28 having the same number of windings as each other. Each secondary winding 28 has a coil part 32 wound around a magnetic core 26, and a pair of lead-out parts 34 leading out both ends of the coil part 32. Each rectification circuit 36 has a high-frequency current line 44 in which a high-frequency current by turning on/off a main switching element 20 flows. The high-frequency current line 44 is provided for each corresponding secondary winding 28, connected between the pair of lead-out parts 34 of the secondary winding 28. The lead-out parts 34 and the high-frequency current line 44 form a high-frequency current loop 46. The plurality of rectification circuits 36 are arranged in the vicinity of the magnetic core 26. The individual high-frequency current loop 46 is formed to have the same shape as the shapes of the high-frequency current loops 46 of the other rectification circuits 36. <P>COPYRIGHT: (C)2013,JPO&INPIT |
