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HYBRID DUAL FULL-BRIDGE DC–DC CONVERTER WITH REDUCED CIRCULATING CURRENT, OUTPUT FILTER, AND CONDUCTION LOSS OF RECTFIER STAGE FOR RF POWER GENERATOR APPLICATION

HYBRID DUAL FULL-BRIDGE DC–DC CONVERTER WITH REDUCED CIRCULATING CURRENT, OUTPUT FILTER, AND CONDUCTION LOSS OF RECTFIER STAGE FOR RF POWER GENERATOR APPLICATION

 ABSTRACT:

          In this project, a hybrid dual full-bridge dc–dc converter for radio frequency (RF) power generator application is proposed to overcome the drawbacks of a conventional phase-shift full-bridge (PSFB) converter such as the large circulating current of the primary side and large output filter size. The proposed converter adopts a dual full-bridge hybrid structurewith a small series capacitor in the primary side and a full-bridge rectifier with two additional low-voltage-rated diodes in the secondary side.With this structure, the proposed converter has advantages of reduction of circulating current, zero-voltage switching (ZVS) operation of all primary switches, size reduction of the output inductor, and low conduction loss of the rectifier stage. Furthermore, the proposed converter can regulate the output voltage very wide by changing the operational mode according to the output voltage.

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