AN ISOLATED FULL-BRIDGE IBB CONVERTER WITH VOLTAGE MULTIPLIER FOR DC MICRO GRID APPLICATIONS

electrical engineering

An isolated full bridge buck-boost converter with single-stage power conversion is proposed in this paper based on high-frequency bridgeless interleaved boost rectifiers are presented. The semiconductors, conduction losses, and switching losses are reduced significantly by integrating the interleaved boost converters into the full-bridge diode-rectifier. Various high-frequency bridgeless boost rectifiers are harvested based on different types of interleaved boost converters, including the conventional boost converter and high step-up boost converters with voltage multiplier and coupled inductor. The full-bridge IBB converter with voltage multiplier is analyzed in detail. The voltage multiplier helps to enhance the voltage gain and reduce the voltage stresses of the semiconductors in the rectification circuit. Hence, a transformer with reduced turns ratio and parasitic parameters, and low-voltage rated MOSFETs and diodes with better switching and conduction performances can be applied to improve the efficiency. Moreover, optimized phase-shift modulation strategy is applied to the full-bridge IBB converter to achieve isolated buck and boost conversion. MATLAB software has used to analyze the effectiveness of the proposed IBB converters and its control strategies.

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