Flyback type power supply

Details Flyback type power supply Flyback type power supply

1976-02-03

1978-01-17

Shoop, William M.

Electric power conversion systems

Current conversion

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

320 1, 323DIG1, H02M 3315

Patent

active

040694496

ABSTRACT:
A flyback type power supply in which dissipation losses associated with switch transition time are substantially eliminated by performing all switching operations at or near zero current by the use of a plurality of resonant circuits. In a first resonant circuit an intermediate storage capacitor is resonantly charged through an inductor and a first switch until, after a half sinewave of charging current, the voltage on the capacitor is twice the input supply voltage. The capacitor is then discharged through a second switch and the primary inductance of a flyback transformer having rectifiers on the secondary that are back-biased initially so as to provide a resonant current buildup in the primary winding with an amplitude that follows a sinewave function, the primary voltage following a cosine function. At the peak of the sinewave of current in the primary, the voltage across the transformer reverses in polarity, continuing to follow a cosinewave shape until the secondary voltage exceeds the voltage on the network to be charged. The primary current is then discontinued and the remaining energy stored in the transformer inductance is transferred to the circuit to be charged.

REFERENCES:
patent: 3543130 (1970-11-01), Reijnders
patent: 3904928 (1975-09-01), Sawada et al.

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