Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1996-10-29
1999-02-02
Nguyen, Matthew
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363131, H02M 3335, H02M 7537
Patent
active
058673741
ABSTRACT:
A method and apparatus for providing a rectified voltage to a flyback switch-mode supply circuit with power factor correction is disclosed and claimed. The invention comprises a rectifying bridge and a charge path for charging a capacitor from the rectified voltage obtained from the output of the bridge. The degree of power factor correction is achieved by selecting a time at which either the rectifying bridge output or the capacitor provides a voltage to the supply circuit. The input to the supply circuit is a primary winding having n1 turns between an upper and intermediate tap, and n2 turns between an intermediate and lower tap. The capacitor is connected to the upper tap via a diode, a first rectifying bridge output is connected to the intermediate tap via a diode, and a second rectifying bridge output is connected to the lower tap via a controllable switch. When the rectified voltage is greater than a threshold voltage related to the peak rectified voltage by the ratio n2/(n1+n2), the rectifying bridge outputs provide the voltage to the supply circuit. When the rectified voltage is lower than this threshold voltage, the capacitor provides the voltage to the supply circuit. In this manner, the timing of sources providing voltage to the supply circuit and hence the degree of power factor correction is determined by the ratio of the primary winding turns n1 and n2.
REFERENCES:
patent: 4280174 (1981-07-01), Sonda
patent: 4905136 (1990-02-01), Tanaka
patent: 4928220 (1990-05-01), White
patent: 5420776 (1995-05-01), Peter Preller
patent: 5459650 (1995-10-01), Noro
patent: 5528483 (1996-06-01), Mohandes
Nguyen Matthew
SGS-Thomson Microelectronics S.A.
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