Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1994-04-13
1997-04-29
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 37, 363 98, H02M 5458
Patent
active
056255381
ABSTRACT:
The present invention relates to a high power factor power supply system of high efficiency which is small in size and light in weight. The invention operates by setting the input power factor to 1 and by controlling a resonant converter. The power factor power supply system according to this invention includes: a full wave rectifying means for rectifying an alternating signal; a voltage dividing means for dividing a rectified signal; a capacitor connected in parallel to the voltage dividing means; an inductor connected to the full wave rectifying means; switching means for controlling a supply of current flowing in the inductor; a resonant circuit portion formed of the inductor and capacitor and connected to the switching means; an output circuit for receiving a signal of the resonant circuit portion, rectifying and then transmitting the signal to a load; and a controlling circuit for providing a switching controlling signal to the switching means. The controlling circuit includes a saw tooth wave signal generator, comparing means for comparing an output of the voltage dividing means with a signal of the saw tooth wave signal generator, and a frequency divider for generating a switching controlling signal having a zero area at each switching pulse according to an output of the comparing means.
REFERENCES:
patent: 4677366 (1987-06-01), Wilkinson et al.
patent: 5003454 (1991-03-01), Bruning
patent: 5063490 (1991-11-01), Maehara
patent: 5315496 (1994-05-01), Okochi
patent: 5371667 (1994-12-01), Nakao
Jee Kyung-ha
Lee Young-sik
Patel Rajnikant B.
Samsung Electronics Co,. Ltd.
Wong Peter S.
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