Resonant fly-forward converter circuit

Details Resonant fly-forward converter circuit Resonant fly-forward converter circuit

1997-06-25

1998-11-03

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

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

H02M 3335

Patent

active

058318380

ABSTRACT:
An improved fly forward converter including a capacitor connected across the collector and emitter of a switching transistor to form a parallel resonant circuit with the converter's transformer primary inductance, a diode across the switching transistor collector capacitor to conduct excess energy from the resonant circuit and coupling diodes in the converter's output circuit for coupling the energy in both the forward and flyback phases through an output inductor serially connected between the transformer secondary and the output capacitor. The converter includes a shunt capacitor with circuit values adjusted so that resonant action continues until the switching transistor voltage falls to zero for achieving "zero voltage switching". Zero voltage switching is achieved by varying the duration of the active cycle while the reset cycle duration is fixed and determined by resonant component value.

REFERENCES:
patent: 5126931 (1992-06-01), Jitaru
patent: 5544032 (1996-08-01), Mimura
patent: 5661642 (1997-08-01), Shimashita

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