Circuit for improving the power efficiency of an AC/DC converter

Details Circuit for improving the power efficiency of an AC/DC converter Circuit for improving the power efficiency of an AC/DC converter

1994-11-15

1996-12-03

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 16, 363131, 363 44, 323222, H02M 3335

Patent

active

055814514

ABSTRACT:
A power circuit including an input circuit for receiving an AC power supply voltage from an AC power line, a primary circuit rectifier coupled to the input circuit for rectifying the AC power supply voltage, a transformer having a primary winding, a secondary winding and a tertiary winding. DC coupling member for coupling an output terminal of the primary circuit rectifier to one end of the primary winding of the transformer, a secondary circuit rectifier for rectifying a secondary circuit AC voltage induced across the secondary winding of the transformer to output a DC voltage resulted by its rectification from the power circuit, a switching element coupled to the other end of the primary winding of the transformer, a controller for controlling the duty ratio of the ON/OFF operations of the switching element so as that the output DC voltage from the secondary circuit rectifier is regulated, and a switched frequency AC signal generator, including the tertiary winding of which one end is coupled to one end side of the primary winding of the transformer and a first smoothing capacitor coupled between the other end of the tertiary winding and a reference potential line, for generating an AC signal responsive to the duty ratio of the ON/OFF operation of the switching element across the tertiary winding.

REFERENCES:
patent: 4524411 (1995-06-01), Willis
patent: 5343381 (1994-08-01), Bolduc et al.
patent: 5390099 (1995-02-01), Rilly et al.
Electronics Techniques, vol. 35, No. 3, 1993, pp. 56-65.

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