Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Patent
1994-01-14
1995-07-25
Wong, Peter S.
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
323288, 323266, G05F 110
Patent
active
054365503
ABSTRACT:
This invention provides an AC-DC converter in which the shape and the cost do not increase by a measure for a harmonic distortion in the power factor improved AC-DC converter generating little harmonic distortion. In the AC-DC converter, a control input terminal of a switching transistor of an active filter is connected to an output terminal of a flip-flop, a set input terminal of which is connected to a DC-DC converter to receive a synchronizing pulse signal therefrom. A reset input terminal of the flip-flop is connected to an output terminal of a comparator to receive an OFF-timing signal from the comparator. The comparator determines OFF-timing of the switching transistor by comparing a level voltage with an outout voltage from a saw-tooth wave generating circuit. Thereby since it is not required that an active filter has a multiplier and an an oscillating circuit, its circuit construction is simple and the AC-DC converter in small size and at low cost is realized.
REFERENCES:
patent: 4307441 (1981-12-01), Bello
patent: 4355277 (1982-10-01), Davis et al.
patent: 4975820 (1990-12-01), Szepesi
patent: 5164890 (1992-11-01), Nakagawa et al.
patent: 5305191 (1994-04-01), Loftus
Nguyen Matthew V.
Tokyo, Inc.
Wong Peter S.
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