Low-noise switching power supply having variable reluctance tran

Details Low-noise switching power supply having variable reluctance tran Low-noise switching power supply having variable reluctance tran

1988-02-10

1989-10-24

Beha, Jr., William H.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

323250, 363 23, 363133, H02M 3337

Patent

active

048766380

ABSTRACT:
There is provided a low-noise switching power supply for producing a regulated output voltage from an unregulated supply. The power supply includes a main transformer having first, second and third legs. A primary winding associated with a first leg produces an alternating magnetic flux in the core. A load winding associated with a second leg produces the output voltage from the power supply. A control winding is associated with the third leg. The regulated output voltage is compared to a reference voltage and used to operate a control circuit which alternately short circuits the control winding so as to vary the reluctance pass in the transformer and maintain the output voltage at a substantially constant predetermined value. A feedback circuit including a coupling transformer connects the primary coil to the switching circuit to improve regulation and provide a "soft start" capability.

REFERENCES:
patent: 3660749 (1972-05-01), Kadri
patent: 4177418 (1979-12-01), Brueckner et al.
patent: 4327348 (1982-04-01), Hirayama
patent: 4342075 (1982-07-01), Hiromitsu
patent: 4737704 (1988-04-01), Kalinnikov et al.
patent: 4782437 (1988-11-01), Nishiyama et al.

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