Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Digital Load Sharing Method for Converter parallel Operation
Authors Kwang-Min Yoo ; Won-Yong Kim ; Seung-Hee Park ; Dong-Hoo Lee ; Yun-Sung Kim ; Yu-Seok Jeong ; Jun-Young Lee
DOI 10.6113/TKPE/2012.17.2.150
Page pp.150-157
ISSN 1229-2214
Keywords Load share; Parallel operation; LLC; bridgeless PFC; Server power
Abstract This paper presents CAN-based parallel-operation and load-sharing techniques for the communication server power supply. With the load information obtained through CAN communication, each modules performs its current control independently and the power unbalance caused by impedance differences of converter modules can be reduced. In conventional method, slave modules are controlled by master module. On the other hand, the proposed load share algorithm uses the Multi-Master method. Therefore, accurate load sharing can be accomplished by the reference structure of each module’s average current. Each converter has two stages and it is separated into PFC, which is responsible for harmonic regulation, and LLC resonant converter, which controls output voltage. To verified the performance of the proposed method, two 2KW prototypes has been implemented and experimented.