48V to 1V voltage regulator module with magnetic integration

With the rapid development of data center, the promotion for efficiency and power density of the voltage regulator module (VRM) are paid considerable attention. Passive components take up a large proportion of the total volume, and the widely used two-stage converter causes large power loss. In this paper, a novel magnetic structure integrating the magnetic parts of two interleaved converters using single-stage converter is proposed. The transformer and the two inductors of current-doubler rectifier (CDR) are integrated into one magnetic. The magnetic parts of the two interleaved phases are then integrated into one core, with a phase shifting angle to emigrate the current ripple of the output inductor. Compared to the original two interleaved phases, the proposed integrated single-stage converter has higher density and lower core losses. A 1V/120A simulation based on Maxwell and simplorer and a prototype of single-stage converter operating at 1MHz with GaN devices are presented to verify the theoretical analysis.