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This paper proposes new rectifiers in the center-tap transformer to provide higher input/output (I/O) voltage gain with an equal transformer turns-ratio in the LLC resonant converter: a voltage tripler rectifier and a voltage quadrupler rectifier, which have simple structures with one capacitor and two diodes, and three and four times higher I/O voltage gain than a center-tap rectifier, respectively. Each rectifier is compared in terms of the transformer turns-ratio and the magnetizing offset current, and the voltage and current stresses in the capacitors and diodes. The validity of these proposed rectifiers in the half-bridge (HB) LLC resonant converter is confirmed by the experimental results from a 100 V/200 W output prototype.

Voltage Multiplier with High Input/Output Voltage Gain from Center-Tap Rectifier-Voltage Tripler and Quadrupler