Control of Power Electronic Converters
Technical Dialogue Session
SCC-LLC converter, current sharing, Hysteresis comparison, Digital control
Interleaving technique could be used to apply LLC resonant converter in high-power high-current applications. However, component tolerance among resonant tanks causes severe load sharing problem, leading to performance degrading. In this paper, full-wave Switch-Controlled Capacitor (SCC) is added into resonant tank to compensate component tolerances and achieve load sharing. An adaptive hysteresis comparison control scheme is proposed to adjust SCC angle α. The proposed control strategy only occupies few resources; thus, low-cost digital controller could be used. Experimental results of a 250V - 430V input, 14V/260A output, three-phase interleaved SCC-LLC prototype demonstrate the effectiveness and feasibility of the proposed method.