Optimal resetting of the transformer's core in single ended forw

Details Optimal resetting of the transformer's core in single ended forw Optimal resetting of the transformer's core in single ended forw

1982-02-04

1984-04-03

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 56, H02M 3335

Patent

active

044411464

ABSTRACT:
The transformer's core in single ended forward converters is reset by a "magnetizing current mirror" consisting of a capacitor in series with an auxiliary switch which, during the OFF period of the primary switch, couples the capacitor to one of the transformer's windings to form a resonant circuit with the transformer's magnetizing inductance. The resonant circuit recycles the transformer's magnetizing energy by creating a mirror image of the magnetic flux between ON periods. This maximizes the flux swing available within a given core. The voltage stress on the primary switch is minimized as the voltage across the switch during the OFF period is approximately constant and automatically tailored to avoid dead time for arbitrary values of the switch duty cycle.

REFERENCES:
patent: 3621363 (1971-11-01), Ginnman et al.
patent: 3963973 (1976-06-01), Vermolen
patent: 4063306 (1977-12-01), Perkins et al.
S. Hayes, "A Design Technique for Optimizing the Power Device Utilization in Feed--Forward Converters," Proceedings of Powercon 8, 1981, pp. 1-10.
R. Severns, "Switchmode and Resonant Converter Circuits".
S. Clemente, B. Pelly, R. Ruttonsha, "A Universal 100 kHz Power Supply Using a Single HEXFET," International Rectifier Corporation Applications Note AN-939, 1980, pp. 60-70.

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