AC-DC converter

Details AC-DC converter AC-DC converter

1994-09-08

1995-08-08

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 56, H02M 3335

Patent

active

054404738

ABSTRACT:
The present invention provides an AC-DC converter in which an application range of an AC input voltage can be extended, keeping a voltage in a circuit from rising at a light load. In an AC-DC converter having a rectifier 3, a boost chopper 4 and a DC-DC converter 5, a PWM circuit 6, an one-shot multivibrator 7, a pulse synthesizer 8 and a comparator 9 are further arranged. The pulse synthesizer 8 generates a second pulse signal having a pulse width being narrower by a pulse width of the delay pulse V.sub.pD than that of the first pulse signal V.sub.pa by means of the first pulse signal V.sub.pa which the PWM circuit 6 output s and a delay pulse V.sub.pD generating in said one-shot multivibrator 7. The comparator 9 compares a voltage V.sub.C boosted up by the boost chopper 4 with a reference voltage V.sub.REF to stop generating the delay pulse when voltage V.sub.C drops below the reference voltage V.sub.REF .

REFERENCES:
patent: 4604563 (1986-08-01), Min
patent: 5297014 (1994-03-01), Saito et al.

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