Modified power transformer for self-oscillating converter regula

Details Modified power transformer for self-oscillating converter regula Modified power transformer for self-oscillating converter regula

1976-06-28

1981-08-04

Kozma, Thomas J.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

336 83, 336178, 363 21, H02P 1318, H01F 1704

Patent

active

042825679

ABSTRACT:
The ferromagnetic core of a transformer in a switching regulator power supply is configured to improve the efficiency of the supply. Since the switching times and their resultant losses occupy a greater percentage of the energy-storage energy-transfer cycle as the operating frequency increases, efficiency is increased by narrowing the operating frequency range. There is provided a transformer core which allows the inductances in the transformer windings to vary during each energy-storage and energy-transfer half cycle. The initial inductance can be chosen such that a predetermined time interval is added to each half cycle regardless of output load to thereby decrease the operating frequency range.

REFERENCES:
patent: 1132016 (1915-03-01), Jobke
patent: 1353711 (1920-09-01), Bergman
patent: 2025093 (1935-12-01), Cotter et al.
patent: 2852730 (1958-09-01), Magnuski
patent: 3112439 (1963-11-01), Rosin
patent: 3546571 (1970-12-01), Fletcher
patent: 3603864 (1971-09-01), Thaler
patent: 3809994 (1974-05-01), Enni

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