Variable leakage transformer and control circuit therefore

Details Variable leakage transformer and control circuit therefore Variable leakage transformer and control circuit therefore

1979-12-04

1982-05-04

Beha, Jr., William H.

Electricity: power supply or regulation systems

Output level responsive

Using a transformer or inductor as the final control device

307 17, 307 31, 323253, 323334, 323335, 363 95, G05F 120

Patent

active

043284582

ABSTRACT:
A variable leakage transformer having a closed main magnetic path and a closed submagnetic path having a leg common with said main magnetic path. A primary winding is wound on said common leg, and a secondary winding is wound on said main magnetic path. The magnetic flux in the common leg is controlled by other control windings which are connected to a control DC power source. The primary winding has two portions, and one of them is closely coupled magnetically with the secondary winding in order to improve the output waveform. By controlling the magnetic flux in the sub-magnetic path, the leakage of the flux induced by the primary winding from the main magnetic path to the sub-magnetic path can be controlled; thus the coupling between the primary and the secondary winding, and conduction period in each cycle of the AC output voltage are controlled. The control of the conduction period in each cycle provides control of the power transmitted from the primary winding to the secondary winding. Because the core is made of ferrite, the transformer can be utilized at high frequency, and the size of the transformer can thus be reduced.

REFERENCES:
patent: 1376978 (1921-05-01), Stoekle
patent: 2281593 (1942-05-01), Odessey
patent: 2989686 (1961-06-01), Pinckaers et al.
patent: 3183429 (1965-05-01), Baycura et al.
patent: 3188552 (1965-06-01), Owen
patent: 3324379 (1967-06-01), Mulder
patent: 4004251 (1977-01-01), Hesler et al.
Electrical Engineering, pp. 956-960, Sep. 1936.

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