Extreme Step-Down Ratio Single-Stage Solution for 48V-to-1V Point-of-Load Converter

Chang Wang; Bima Sanusi; Ziwei Ouyang

doi:10.30420/566091317

Extreme Step-Down Ratio Single-Stage Solution for 48V-to-1V Point-of-Load Converter

Chang Wang, Bima Sanusi^*, Ziwei Ouyang

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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.

Original language	English
Title of host publication	Proceedings of International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
Publisher	VDE Verlag
Publication date	2023
Pages	2294-2300
ISBN (Electronic)	978-3-8007-6091-6
DOIs	https://doi.org/10.30420/566091317
Publication status	Published - 2023
Event	2023 International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management - Nuremberg, Germany Duration: 9 May 2023 → 11 May 2023

Conference

Conference	2023 International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
Country/Territory	Germany
City	Nuremberg
Period	09/05/2023 → 11/05/2023

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title = "Extreme Step-Down Ratio Single-Stage Solution for 48V-to-1V Point-of-Load Converter",

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.",

author = "Chang Wang and Bima Sanusi and Ziwei Ouyang",

note = "Publisher Copyright: {\textcopyright} VDE VERLAG GMBH · Berlin · Offenbach.; 2023 International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, PCIM Europe 2023 ; Conference date: 09-05-2023 Through 11-05-2023",

year = "2023",

doi = "10.30420/566091317",

language = "English",

pages = "2294--2300",

booktitle = "Proceedings of International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management",

publisher = "VDE Verlag",

}

Wang, C, Sanusi, B & Ouyang, Z 2023, Extreme Step-Down Ratio Single-Stage Solution for 48V-to-1V Point-of-Load Converter. in Proceedings of International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management. VDE Verlag, pp. 2294-2300, 2023 International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, Nuremberg, Bavaria, Germany, 09/05/2023. https://doi.org/10.30420/566091317

Extreme Step-Down Ratio Single-Stage Solution for 48V-to-1V Point-of-Load Converter. / Wang, Chang; Sanusi, Bima ; Ouyang, Ziwei.
Proceedings of International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management. VDE Verlag, 2023. p. 2294-2300.

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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Extreme Step-Down Ratio Single-Stage Solution for 48V-to-1V Point-of-Load Converter

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