In this paper, the
modified LCC type of series-parallel Resonant Converter (RC) was designed and
state-space modeling analysis was implemented. In this proposed converter, one
leg of full bridge diode rectifier is replaced with Synchronous Rectifier (SR)
switches. The proposed LCC converter？is
controlled using frequency modulation in the nominal state. During hold-up
time, the SRswitches control is changed from in-phase to phase-shifted gate
signal to obtain high DC voltage conversion ratio. Furthermore, the closed loop
PI and fuzzy provide control on the output side without decreasing the
switching frequency. The parameter such as conduction loss on primary and
secondary side, switching loss, core and copper also reduced. Simultaneously,
the efficiency is increased about 94.79 is realized by this scheme. The
proposed converter with an input of 40 V is built to produce an output of 235 V
with the help of ZVS boost converter？[1]？even under line and load disturbances. As a comparison, the closed
loop fuzzy controller performance is feasible and less sensitive than PI
controller.
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