Multiphase Control for Robust and Complete Soft-Charging Operation of Dual Inductor Hybrid Converter

Gabsu Seo; Tianshi Xie; Ratul Das; Dragan Maksimovic; Hanh-Phuc Le

doi:10.1109/APEC.2019.8721951

Multiphase Control for Robust and Complete Soft-Charging Operation of Dual Inductor Hybrid Converter

Gabsu Seo, Tianshi Xie, Ratul Das, Dragan Maksimovic, Hanh-Phuc Le

Power Systems Engineering

University of Colorado Boulder

Research output: Contribution to conference › Paper › peer-review

20 Scopus Citations

Abstract

This paper presents a new Multiphase Dual Inductor Hybrid (MP-DIH) Converter for application in data center and telecommunication systems. The converter is based on addition of two output filter inductors to a Dickson switched-capacitor converter. The inductors are operated in multiple phases that are non-overlapped and evenly distributed over one switching cycle, completely soft-charging all flying capacitors even in the presence of practical capacitor mismatches and voltage ripples. In this converter operation, each branch of the switched-capacitor network is activated individually in one charging phase, and two interleaved inductors are employed to softly charge and discharge the capacitors to achieve high efficiency without any complex capacitor sizing or split phase operation. To verify the topology and its soft-charging advantages, a 48V-to-1.8V 20W experimental converter prototype is constructed. The converter achieves 92.4% peak efficiency for 40V-to-1.8V conversion and 92.1% peak efficiency for 48V-to-1.8V conversion at 4A load, and with 20% capacitance variations.

Original language	American English
Pages	1-5
Number of pages	5
DOIs	https://doi.org/10.1109/APEC.2019.8721951 https://doi.org/10.1109/APEC.2019.8721951
State	Published - 24 May 2019
Event	34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019 - Anaheim, United States Duration: 17 Mar 2019 → 21 Mar 2019

Conference

Conference	34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019
Country/Territory	United States
City	Anaheim
Period	17/03/19 → 21/03/19

Bibliographical note

Publisher Copyright:
© 2019 IEEE.

NREL Publication Number

NREL/CP-5D00-74311

Keywords

Complete soft-charging
Hybrid converter
Multiphase operation
Switched capacitor network

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Seo, G., Xie, T., Das, R., Maksimovic, D., & Le, H.-P. (2019). Multiphase Control for Robust and Complete Soft-Charging Operation of Dual Inductor Hybrid Converter. 1-5. Paper presented at 34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019, Anaheim, United States. https://doi.org/10.1109/APEC.2019.8721951, https://doi.org/10.1109/APEC.2019.8721951

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Seo, G, Xie, T, Das, R, Maksimovic, D & Le, H-P 2019, 'Multiphase Control for Robust and Complete Soft-Charging Operation of Dual Inductor Hybrid Converter', Paper presented at 34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019, Anaheim, United States, 17/03/19 - 21/03/19 pp. 1-5. https://doi.org/10.1109/APEC.2019.8721951, https://doi.org/10.1109/APEC.2019.8721951

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AB - This paper presents a new Multiphase Dual Inductor Hybrid (MP-DIH) Converter for application in data center and telecommunication systems. The converter is based on addition of two output filter inductors to a Dickson switched-capacitor converter. The inductors are operated in multiple phases that are non-overlapped and evenly distributed over one switching cycle, completely soft-charging all flying capacitors even in the presence of practical capacitor mismatches and voltage ripples. In this converter operation, each branch of the switched-capacitor network is activated individually in one charging phase, and two interleaved inductors are employed to softly charge and discharge the capacitors to achieve high efficiency without any complex capacitor sizing or split phase operation. To verify the topology and its soft-charging advantages, a 48V-to-1.8V 20W experimental converter prototype is constructed. The converter achieves 92.4% peak efficiency for 40V-to-1.8V conversion and 92.1% peak efficiency for 48V-to-1.8V conversion at 4A load, and with 20% capacitance variations.

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Multiphase Control for Robust and Complete Soft-Charging Operation of Dual Inductor Hybrid Converter

Abstract

Conference

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Keywords

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