High power voltage multiplier (VM) PFC Converter with inherent ZCS Characteristics and high step-ip gain for enhanced low-line efficiency [articol]

Abstract

In this paper, a Voltage Multiplier (VM) converter configuration has been designed for high Power PFC application, ensuring reduced losses and high system efficiency.The conventional PFC system is improved with adding VM circuit configuration that enhances the static gain features with moderate duty ratio (D), and hence, the reverse recovery (RR) issue is resolved. The VM section inherently adds two main specific features of clamping behavior and ZCS phenomenon to the PFC system. An experimental prototype of 2 kW, 600 V VM PFC converter configuration is designed and its effectiveness is validated under low line input of 100 V , operating at a high duty ratio, D = 0:67. The Real-Time Interface (RTI) feature of dSPACE1104 and MATLAB/Simulink are used to give the control signal for the verification of the system. Always, less than half of the output voltage (300 V ) appears across the switches of the converter, hence, voltage stress of the switch is minimized. Also, ZCS phenomenon is evident during switching commutations due to the snubber circuit behavior of the resonant tank, included in the proposed PFC converter. Hence, the overall system efficiency is improved. Furthermore, higher system efficiency is maintained for different rating which has been tested in this research work.