| 摘要 |
A pulse transformer for a flyback converter type switching power source has a ferrite core (10,11) with a pair of side legs (10a, 11a) and a center leg (10b, 11b) which is shorter than said side leg so that an air gap G is provided in the magnetic path along the center leg, and the windings on a bobbin (15) on said ferrite core is improved by positioning said gap G at the end portion of the center leg close to the end of the bobbin, and a dielectric belt (16b) on the bobbin (15) so that no winding exists around said gap. Thus, leakage flux around said gap does not interlink with the windings, and no eddy current flows in the windings, and a partial temperature raise in the windings is prevented.
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