High step-up isolated resonant converter with voltage quadrupler rectifier and dual-phase-shift control

An isolated resonant converter with voltage-quadrupler rectifier (VQR) and dual-phase-shift (DPS) control strategy is proposed for high step-up and wide voltage range applications. The VQR is composed of a resonant-type voltage doubler and a conventional voltage doubler. The output voltage is improved and the voltage stresses of the secondary-side devices are reduced significantly. Hence, low voltage-rated switches and diodes with better switching and conduction performances can be applied to improve the efficiency. The DPS modulation strategy is adopted to implement the boost and buck modes operation, and to achieve wide voltage gain range. With the DPS control strategy, zero-voltage switching performance is achieved for both the primary and secondary sides power devices, and zero-current switching is achieved for all of the diodes within the entire voltage and load ranges. The operational principles and characteristics of the proposed converter are presented in detail. The analysis and performance have been fully validated experimentally on a 400 V/400 W output hardware prototype.