Extreme Step-Down Ratio Single-Stage Solution for 48V-to-1V Point-of-Load Converter
Conference: PCIM Europe 2023 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/09/2023 - 05/11/2023 at Nürnberg, Germany
doi:10.30420/566091317
Proceedings: PCIM Europe 2023
Pages: 7Language: englishTyp: PDF
Authors:
Wang, Chang; Sanusi, Bima; Ouyang, Ziwei (DTU Electro, Technical University of Denmark, Denmark)
Abstract:
This paper proposes a single-stage point-of-load (POL) converter design to directly step 48 V down to 1 V. The converter utilizes the multi-phase series capacitor buck to serve as the extreme step-down voltage regulator module (VRM). There are 8 phases in a single VRM with a modified modulation strategy. An easy-to-design inductor model is presented with the inductor achieving optimal resistance with respect to volume and saturation limit. A converter prototype with the size of 30 x 40 x 18 mm3 is built and tested under 250kHz and 400kHz switching frequency. Peak efficiency of 87% is obtained. A 140A output current is delivered with 80% efficiency. Comparing to traditional cascaded POL solution, the proposed converter has great potential in achieving higher efficiency and higher power density. With shared current stress in multi-phases, extremely large output current (>500A) can be delivered for future data center CPU and GPU application.