| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a switching power supply unit capable of reducing the volume of a transformer by using a multilayer substrate or a laminated plate-shaped conductor as the winding of the transformer, thus achieving high efficiency, size reduction and noise suppression. <P>SOLUTION: In this switching power supply device, two or more capacitors 23 to 26 connected in series are connected to input terminals 22a, 22b of two or more switching power supplies including switching elements 27 to 30, transformers 31, 32 and rectifying elements 33, 34, 37, 38, so that the voltage obtained in two or more capacitors 23 to 26 is inputted, and the voltage produced by the two or more switching power supply is outputted to common output terminals 40a, 40b. The transformers 31, 32 are constructed by piling up coils composed of the plate-shaped conductor so as to function as the winding. With this constitution, transmission of noise through the winding can be suppressed and a stable output characteristic can be obtained. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
