Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title A Feedforward Compensation Method for 120Hz Output Voltage Ripple Reduction of LLC Resonant Converter
Authors Jong-Tae Yoon ; Kui-Jun Lee
DOI 10.6113/TKPE.2021.26.1.46
Page pp.46-52
ISSN 1229-2214
Keywords LLC resonant converter; 120Hz output voltage ripple; DC/DC converter; Feedforward
Abstract This study proposes a feedforward compensation control method to reduce 120 Hz output voltage ripple in a single-phase AC/DC rectifier system composed of PFC and LLC resonant converters. The proposed method compensates for the voltage ripple of the DC-link by using the AC input and DC output power difference, and then reduces the final output voltage ripple component of 120 Hz through feedforward compensation based on the linearized frequency gain curve of the LLC resonant converter. Through simulation and experimental results, the validity of the ripple reduction performance was verified by comparing the conventional PI controller and the proposed feedforward compensation method.