Resonant converter

Details Resonant converter Resonant converter

2009-01-28

2011-12-27

Zhang, Jue (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021150

Reexamination Certificate

active

08085558

ABSTRACT:
A resonant converter includes a square wave generator including a first switch and a second switch, and generating a first square wave corresponding to an input voltage by alternately turning on/off the first and second switches; a resonator including a first coil of a primary coil of a transformer, and generating a resonance waveform corresponding to the first square wave; and an output unit including a second coil of a secondary coil of the transformer, and outputting a voltage corresponding to a current generated in the second coil corresponding to the resonance waveform. The square wave generator includes a pulse frequency modulation controller for turning on/off the first and second switches, comparing a first voltage linearly increased while the second switch maintains the turn-on state and a second voltage corresponding to an integration value on the time of the current flowing to the second switch when the second switch is turned off, and changing on/off drive frequencies of the first and second switches according to a comparison result. Therefore, a resonant converter driven with safety is realized.

REFERENCES:
patent: 6018467 (2000-01-01), Majid et al.
patent: 6087782 (2000-07-01), Majid et al.
Fairchild Semiconductor, Application Note AN-4151, Half-Bridge LLC Resonant Converter Design using FSFR-Series Fairchild Power Switch (FPS), Oct. 2007, 1.0.0, pp. 1-17.

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