Offset resonance zero volt switching flyback converter

Details Offset resonance zero volt switching flyback converter Offset resonance zero volt switching flyback converter

1999-02-12

2000-05-30

Riley, Shawn

Electric power conversion systems

Current conversion

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

363 56, H02M 3335

Patent

active

060698039

ABSTRACT:
A continuous mode flyback converter circuit which includes elements capable of generating a zero volt switching (ZVS) signal across the power switch. The ZVS generating elements include a switched shunt inductance coupled in parallel with active clamp components and connected across the primary winding of the power transformer. The circuit reduces the reverse recovery current through the secondary stage rectifier and the current through the active clamp switch during operation of the converter. The ZVS generating elements may also be used for flyback converters which do not utilize an active clamp.

REFERENCES:
patent: 5410467 (1995-04-01), Smith et al.
patent: 5485361 (1996-01-01), Sokal
patent: 5570278 (1996-10-01), Cross
patent: 5796595 (1998-08-01), Cross
patent: 5880943 (1999-03-01), Yokoyama
Stojcic et al. "Small-Signal Characterization of Active-Clamp PWM Converters," 13th Annual Power Electronics Seminar, Blacksburg, Virginia, Sep. 1995, pp. 237-245.

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