PROJECT TITLE:

Interleaved Boost Integrated LLC Resonant Converter With FixedFrequency PWM Control for Renewable Energy Generation Applications - 2015

ABSTRACT:

This paper proposes a current-fed LLC resonant converter that's ready to attain high potency over a large input voltage range. It is derived by integrating a two-phase interleaved boost circuit and a full-bridge LLC circuit together by virtue of sharing the identical full-bridge switching unit. Compared with typical full-bridge LLC converter, the gain characteristic is improved in terms of each gain range and optimal operation area, fixed-frequency pulsewidth-modulated (PWM) control is utilized to realize output voltage regulation, and the input current ripple is minimized likewise. The voltage across the turned-off primary-facet switch will be continually clamped by the bus voltage, reducing the switch voltage stress. Besides, its different distinct options, like single-stage configuration, and soft switching for all switches additionally contribute to high power conversion potency. The operation principles are presented, and then the most characteristics concerning gain, input current ripple, and nil-voltage switching (ZVS) considering the nonlinear output capacitance of MOSFET are investigated and compared with typical solutions. Additionally, the planning procedure for some key parameters is presented, and 2 sorts of interleaved boost integrated resonant converter topologies are generalized. Finally, experimental results of a converter prototype with one hundred twenty-240 V input and 24 V/25 A output verify all issues.