| 摘要 |
PCT No. PCT/JP97/04389 Sec. 371 Date Aug. 3, 1998 Sec. 102(e) Date Aug. 3, 1998 PCT Filed Dec. 2, 1997 PCT Pub. No. WO98/25279 PCT Pub. Date Jun. 11, 1998The present invention provides a small, light-weight converter transformer of high efficiency which has an excellent noise characteristic, a high coupling and good output voltage characteristic, low temperature-rise and a high reliability, for use in a switching power supply to be built in an electronic appliance. It has been structured by an inner coil bobbin (28) and an outer coil bobbin (29) provided respectively with three winding grooves (30a-30c) and (30d-30f); a primary winding (21) which is split into three split windings (21a, 21b, 21c) are wound around in winding grooves (30b, 30d, 30f), respectively, and connected in parallel; while secondary windings (23, 24) which are split into two split windings (23a, 23b) and (24a, 24b), respectively, for supplying to major output load are wound around in winding grooves (30a, 30e), and connected in parallel; secondary windings (25, 26, 27) are wound around in winding groove (30c); primary sub-winding (22) is wound around in winding groove (30b) which has been wound around with split winding (21a) of primary winding; and a magnetic core (31) made of a ferrite core is assembled to.
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