Transformer for a flyback type converter

Details Transformer for a flyback type converter Transformer for a flyback type converter

1988-12-30

1989-12-12

Kozma, Thomas J.

Inductor devices

With closed core interrupted by an air gap

336198, H01F 1706, H01F 2730

Patent

active

048870617

ABSTRACT:
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.

REFERENCES:
patent: 1876451 (1932-09-01), Guntler
patent: 4009460 (1977-02-01), Fukui et al.

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