A High-Voltage Low-Power Switched-Capacitor DC-DC Converter Based on GaN and SiC Devices for LED Drivers

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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A High-Voltage Low-Power Switched-Capacitor DC-DC Converter Based on GaN and SiC Devices for LED Drivers. / Fan, Lin; Knott, Arnold; Jørgensen, Ivan Harald Holger.

In: Elektronika ir Elektrotechnika, Vol. 24, No. 3, 2018, p. 33-40.

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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@article{4bc05a7c3a54422eac4b8062d9c2999b,
title = "A High-Voltage Low-Power Switched-Capacitor DC-DC Converter Based on GaN and SiC Devices for LED Drivers",
abstract = "Previous research on switched-capacitor DC-DC converters has focused on low-voltage and/or high-power ranges where the efficiencies are dominated by conduction loss. Switched-capacitor DC-DC converters at high-voltage (> 100 V) low-power (< 10 W) levels with high efficiency and high power density are anticipated to emerge. This paper presents a switched-capacitor converter with an input voltage up to 380 V (compatible with rectified European mains) and a maximum output power of 10 W. GaN switches and SiC diodes are analytically compared and actively combined to properly address the challenges at high-voltage low-current levels, where switching loss becomes significant. Further trade-off between conduction loss and switching loss is experimentally optimized with switching frequencies. Three variant designs of the proposed converter are implemented, and the trade-off between the efficiency and the power density is validated with measurement results. A peak efficiency of 98.6{\%} and a power density of 7.5 W/cm3 are achieved without heatsink or airflow.The characteristic impedance level of the switched-capacitor converter is an order of magnitude higher than previously published ones. The converter is intended for LED drivers.",
keywords = "DC-DC power converters, Gallium nitride, Silicon carbide, Switched capacitor circuits, Wide band gap semiconductors",
author = "Lin Fan and Arnold Knott and J{\o}rgensen, {Ivan Harald Holger}",
year = "2018",
doi = "10.5575/j01.eie.24.03.20979",
language = "English",
volume = "24",
pages = "33--40",
journal = "Elektronika ir Elektrotechnika",
issn = "1392-1215",
publisher = "Kauno Technologijos Universitetas",
number = "3",

}

RIS

TY - JOUR

T1 - A High-Voltage Low-Power Switched-Capacitor DC-DC Converter Based on GaN and SiC Devices for LED Drivers

AU - Fan, Lin

AU - Knott, Arnold

AU - Jørgensen, Ivan Harald Holger

PY - 2018

Y1 - 2018

N2 - Previous research on switched-capacitor DC-DC converters has focused on low-voltage and/or high-power ranges where the efficiencies are dominated by conduction loss. Switched-capacitor DC-DC converters at high-voltage (> 100 V) low-power (< 10 W) levels with high efficiency and high power density are anticipated to emerge. This paper presents a switched-capacitor converter with an input voltage up to 380 V (compatible with rectified European mains) and a maximum output power of 10 W. GaN switches and SiC diodes are analytically compared and actively combined to properly address the challenges at high-voltage low-current levels, where switching loss becomes significant. Further trade-off between conduction loss and switching loss is experimentally optimized with switching frequencies. Three variant designs of the proposed converter are implemented, and the trade-off between the efficiency and the power density is validated with measurement results. A peak efficiency of 98.6% and a power density of 7.5 W/cm3 are achieved without heatsink or airflow.The characteristic impedance level of the switched-capacitor converter is an order of magnitude higher than previously published ones. The converter is intended for LED drivers.

AB - Previous research on switched-capacitor DC-DC converters has focused on low-voltage and/or high-power ranges where the efficiencies are dominated by conduction loss. Switched-capacitor DC-DC converters at high-voltage (> 100 V) low-power (< 10 W) levels with high efficiency and high power density are anticipated to emerge. This paper presents a switched-capacitor converter with an input voltage up to 380 V (compatible with rectified European mains) and a maximum output power of 10 W. GaN switches and SiC diodes are analytically compared and actively combined to properly address the challenges at high-voltage low-current levels, where switching loss becomes significant. Further trade-off between conduction loss and switching loss is experimentally optimized with switching frequencies. Three variant designs of the proposed converter are implemented, and the trade-off between the efficiency and the power density is validated with measurement results. A peak efficiency of 98.6% and a power density of 7.5 W/cm3 are achieved without heatsink or airflow.The characteristic impedance level of the switched-capacitor converter is an order of magnitude higher than previously published ones. The converter is intended for LED drivers.

KW - DC-DC power converters

KW - Gallium nitride

KW - Silicon carbide

KW - Switched capacitor circuits

KW - Wide band gap semiconductors

U2 - 10.5575/j01.eie.24.03.20979

DO - 10.5575/j01.eie.24.03.20979

M3 - Journal article

VL - 24

SP - 33

EP - 40

JO - Elektronika ir Elektrotechnika

JF - Elektronika ir Elektrotechnika

SN - 1392-1215

IS - 3

ER -