Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title A Common Capacitor Connected LLC Resonant Converter with Auxiliary Switches Operating Over a Wide Output Voltage Control Range
Authors Jae-Sung Oh ; Min-Ji Kim ; Ji-Cheol Lee ; Eun-Soo Kim ; Yong-Seog Jeon ; Yoon-Sang Kook
DOI 10.6113/TKPE/2019.24.4.294
Page pp.294-302
ISSN 1229-2214
Keywords Resonant converter; LLC converter; PM/FM control; Current sharing; Wide output voltage range
Abstract A capacitor common connected LLC resonant converter with auxiliary switches for a wide output voltage control range is presented in this paper. The proposed converter can be controlled in two ways to achieve a wide output voltage control range of Vo?3Vo. The first control method is performed through pulse width modulation of the auxiliary switches and primary switching devices. The second control method is conducted through frequency modulation of the primary switching devices configured to operate in full-bridge switching modes, when the auxiliary switches are turned off. The feasibility of the proposed converter is verified by the experimental results of a 5 kW prototype.