AC-DC converter

Details AC-DC converter AC-DC converter

1994-09-08

1996-05-07

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

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

323282, H02M 3335, G05F 140

Patent

active

055152570

ABSTRACT:
The present invention provides an AC-DC converter in which a voltage at a light load is kept from rising, and an application range of an AC input voltage can be made broader. In the AC-DC converter having a rectifier 3, a boost chopper 4 and a DC--DC converter, a PWM circuit 6, a frequency divider 7 and a peak value detector 8 are further arranged. A first pulse signal V.sub.pa which the PWM circuit 6 outputs is inputted to a first switching transistor Q1 in the DC--DC converter 5 and the frequency divider 7. The frequency divider 7 divides a frequency of the first pulse signal V.sub.pa according to a frequency dividing control signal which the peak value detector 8 outputs, for monitoring a rectified output voltage in the rectifier 3 and outputs a second pulse signal V.sub.pb generated by the frequency divider 7 to the second switching transistor Q2 in the boost chopper 4.

REFERENCES:
patent: 4025863 (1977-05-01), Higuchi et al.
patent: 4150423 (1979-04-01), Boschert
patent: 5218522 (1993-06-01), Phelps et al.
patent: 5414610 (1995-05-01), Brainard
patent: 5418704 (1995-05-01), Hua et al.

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