Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1986-11-21
1987-08-18
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 80, 363 97, H02M 3335
Patent
active
046881581
ABSTRACT:
A flyback power supply is disclosed which includes a sample and hold feedback path. A pulse width modulation circuit provides control signals for a drive device that determines current excitation pulses for a primary winding of a transformer. A secondary winding of the transformer is connected to a rectifier circuit and provides a DC voltage signal at an output terminal. A selective feedback path is provided between the output terminal and a sense input terminal of the pulse width modulation circuit. The selective feedback path comprises a sample and hold circuit which provides for effectively coupling the output terminal to the sense input terminal at times during the storage of energy in the transformer, corresponding to an increase in transformer flux, and wherein at other times when the transformer flux is decreasing and energy is being transferred from the transformer to the rectifier circuit the feedback path effectively disconnects the output terminal from the sense input. The sample and hold circuit comprises a series pass transistor and a holding capacitor. The series pass transistor is selectively turned on and off in accordance with the control output signal of the pulse width modulation circuit that determines the primary winding current pulses.
REFERENCES:
patent: 4244015 (1981-01-01), Beebe
patent: 4301497 (1981-11-01), Johari
patent: 4326244 (1982-04-01), Josephson
patent: 4454573 (1984-06-01), Petsch et al.
patent: 4458112 (1984-07-01), Svala
patent: 4489369 (1984-12-01), Ginsberg
Graff Timothy E.
Loda Michael A.
Peterson Gregory A.
Melamed Phillip H.
Motorola Inc.
Wong Peter S.
LandOfFree
Flyback power supply does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flyback power supply, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flyback power supply will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1121667