A triangle phase-shift control strategy for interleaved critical-mode power converters

Due to its high conversion efficiency and high power density, interleaved critical-mode converter is widely employed by modern power converters. This topology is utilized in ac-dc, dc-dc, and dc-ac converters. Because of the variable switching-frequency operation, phase-shift control is a challenge in the design of critical-mode power converters. This paper presents a triangle phase-shift control strategy for interleaved critical-mode power converters. Based on circuit parameters of the topology and current information of the master phase, a control ramp is derived to control the current phase of slave phase. Based on the proposed control ramp, triangle phase-shift control is proposed. The proposed control strategy is experimentally verified on a dual-phase interleaved dc-dc converter.