An Asynchronous-Switched-Capacitor DC-DC Converter Based on GaN and SiC Devices

Lin Fan; Christian Kaalø Lumby; Arnold Knott; Ivan Harald Holger Jørgensen

doi:10.1109/WiPDAAsia.2018.8734649

An Asynchronous-Switched-Capacitor DC-DC Converter Based on GaN and SiC Devices

Lin Fan, Christian Kaalø Lumby, Arnold Knott, Ivan Harald Holger Jørgensen

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

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Abstract

For the state-of-the-art switched-capacitor DC-DC converters at high-voltage low-power levels, switching loss becomes a major concern and challenge. Existing switching schemes operate power semiconductors at a single common frequency, which does not optimally address the switching losses, especially for a high-conversion-ratio design. This paper presents a concept of Asynchronous-Switched-Capacitor (ASC), which is applied to the GaN switches that are combined with the SiC diodes to improve the efficiency and the power density. Two stages of switched-capacitors are operating with uncorrelated frequencies, without phase and clock synchronization of the control signals. A 380 V, 6 W, 4:1 conversion ratio converter experimentally validates the concept. The efficiency is improved by 4 % and the
peak-to-peak output voltage ripple is reduced by 39 %, with the proposed ASC switching compared to a synchronous operation. A peak efficiency of 95.4 % is achieved.

Original language	English
Title of host publication	Proceedings of 2018 1st Workshop on Wide Bandgap Power Devices and Applications in Asia
Publisher	IEEE
Publication date	2018
Pages	95-99
ISBN (Print)	9781538643921
DOIs	https://doi.org/10.1109/WiPDAAsia.2018.8734649
Publication status	Published - 2018
Event	IEEE Workshop on Wide Bandgap Power Devices and Applications in Asia 2018 - XI' An Shaanxi, China Duration: 17 May 2018 → 19 May 2018

Workshop

Workshop	IEEE Workshop on Wide Bandgap Power Devices and Applications in Asia 2018
Country/Territory	China
City	XI' An Shaanxi
Period	17/05/2018 → 19/05/2018

Keywords

DC-DC converter
Switched-capacitor
Multilevel
Asynchronous
Mains voltage
High characteristic impedance
Gallium nitride
Silicon carbide
Wide bandgap devices

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title = "An Asynchronous-Switched-Capacitor DC-DC Converter Based on GaN and SiC Devices",

abstract = "For the state-of-the-art switched-capacitor DC-DC converters at high-voltage low-power levels, switching loss becomes a major concern and challenge. Existing switching schemes operate power semiconductors at a single common frequency, which does not optimally address the switching losses, especially for a high-conversion-ratio design. This paper presents a concept of Asynchronous-Switched-Capacitor (ASC), which is applied to the GaN switches that are combined with the SiC diodes to improve the efficiency and the power density. Two stages of switched-capacitors are operating with uncorrelated frequencies, without phase and clock synchronization of the control signals. A 380 V, 6 W, 4:1 conversion ratio converter experimentally validates the concept. The efficiency is improved by 4 % and thepeak-to-peak output voltage ripple is reduced by 39 %, with the proposed ASC switching compared to a synchronous operation. A peak efficiency of 95.4 % is achieved.",

keywords = "DC-DC converter, Switched-capacitor, Multilevel, Asynchronous, Mains voltage, High characteristic impedance, Gallium nitride, Silicon carbide, Wide bandgap devices",

author = "Lin Fan and Lumby, {Christian Kaal{\o}} and Arnold Knott and J{\o}rgensen, {Ivan Harald Holger}",

year = "2018",

doi = "10.1109/WiPDAAsia.2018.8734649",

language = "English",

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pages = "95--99",

booktitle = "Proceedings of 2018 1st Workshop on Wide Bandgap Power Devices and Applications in Asia",

publisher = "IEEE",

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note = "IEEE Workshop on Wide Bandgap Power Devices and Applications in Asia 2018, WiPDA Asia 2018 ; Conference date: 17-05-2018 Through 19-05-2018",

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Fan, L, Lumby, CK, Knott, A & Jørgensen, IHH 2018, An Asynchronous-Switched-Capacitor DC-DC Converter Based on GaN and SiC Devices. in Proceedings of 2018 1st Workshop on Wide Bandgap Power Devices and Applications in Asia . IEEE, pp. 95-99, IEEE Workshop on Wide Bandgap Power Devices and Applications in Asia 2018, XI' An Shaanxi, China, 17/05/2018. https://doi.org/10.1109/WiPDAAsia.2018.8734649

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AU - Knott, Arnold

AU - Jørgensen, Ivan Harald Holger

PY - 2018

Y1 - 2018

N2 - For the state-of-the-art switched-capacitor DC-DC converters at high-voltage low-power levels, switching loss becomes a major concern and challenge. Existing switching schemes operate power semiconductors at a single common frequency, which does not optimally address the switching losses, especially for a high-conversion-ratio design. This paper presents a concept of Asynchronous-Switched-Capacitor (ASC), which is applied to the GaN switches that are combined with the SiC diodes to improve the efficiency and the power density. Two stages of switched-capacitors are operating with uncorrelated frequencies, without phase and clock synchronization of the control signals. A 380 V, 6 W, 4:1 conversion ratio converter experimentally validates the concept. The efficiency is improved by 4 % and thepeak-to-peak output voltage ripple is reduced by 39 %, with the proposed ASC switching compared to a synchronous operation. A peak efficiency of 95.4 % is achieved.

AB - For the state-of-the-art switched-capacitor DC-DC converters at high-voltage low-power levels, switching loss becomes a major concern and challenge. Existing switching schemes operate power semiconductors at a single common frequency, which does not optimally address the switching losses, especially for a high-conversion-ratio design. This paper presents a concept of Asynchronous-Switched-Capacitor (ASC), which is applied to the GaN switches that are combined with the SiC diodes to improve the efficiency and the power density. Two stages of switched-capacitors are operating with uncorrelated frequencies, without phase and clock synchronization of the control signals. A 380 V, 6 W, 4:1 conversion ratio converter experimentally validates the concept. The efficiency is improved by 4 % and thepeak-to-peak output voltage ripple is reduced by 39 %, with the proposed ASC switching compared to a synchronous operation. A peak efficiency of 95.4 % is achieved.

KW - DC-DC converter

KW - Switched-capacitor

KW - Multilevel

KW - Asynchronous

KW - Mains voltage

KW - High characteristic impedance

KW - Gallium nitride

KW - Silicon carbide

KW - Wide bandgap devices

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BT - Proceedings of 2018 1st Workshop on Wide Bandgap Power Devices and Applications in Asia

PB - IEEE

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ER -

An Asynchronous-Switched-Capacitor DC-DC Converter Based on GaN and SiC Devices

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