TY - GEN
T1 - A GaN-based 97% efficient hybrid switched-capacitor converter with lossless regulation capability
AU - Lei, Yutian
AU - Ye, Zichao
AU - Pilawa Podgurski, Robert Carl Nikolai
PY - 2015/10/27
Y1 - 2015/10/27
N2 - DC-DC converters for large conversion ratio applications face challenges such as high device stress and large inductor size. Switched-capacitor (SC) converters are known to have reduced device stress and no inductors, but the associated large transient current and poor efficiency at regulated output have prevented their wide adoptions. In this work, a complete solution is proposed, including the control and design considerations for a magnetic hybrid type of SC converter, so that the capacitor charging loss is eliminated and high efficiency is maintained with voltage regulation. Compared to conventional buck converters, the proposed converter offers the advantages of higher efficiency and significantly reduced inductor size. A 170 V to 24 V, 70 W prototype with a wide input and output voltage operating range is implemented using GaN transistors. A low profile heat-sink is designed and built by 3D printing to sufficiently cool the converter. A peak efficiency of 97% and a power density of 276 W/in3 are achieved, which compare favorably to both conventional SC converters and buck converters.
AB - DC-DC converters for large conversion ratio applications face challenges such as high device stress and large inductor size. Switched-capacitor (SC) converters are known to have reduced device stress and no inductors, but the associated large transient current and poor efficiency at regulated output have prevented their wide adoptions. In this work, a complete solution is proposed, including the control and design considerations for a magnetic hybrid type of SC converter, so that the capacitor charging loss is eliminated and high efficiency is maintained with voltage regulation. Compared to conventional buck converters, the proposed converter offers the advantages of higher efficiency and significantly reduced inductor size. A 170 V to 24 V, 70 W prototype with a wide input and output voltage operating range is implemented using GaN transistors. A low profile heat-sink is designed and built by 3D printing to sufficiently cool the converter. A peak efficiency of 97% and a power density of 276 W/in3 are achieved, which compare favorably to both conventional SC converters and buck converters.
UR - http://www.scopus.com/inward/record.url?scp=84963569176&partnerID=8YFLogxK
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U2 - 10.1109/ECCE.2015.7310262
DO - 10.1109/ECCE.2015.7310262
M3 - Conference contribution
AN - SCOPUS:84963569176
T3 - 2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015
SP - 4264
EP - 4270
BT - 2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015
Y2 - 20 September 2015 through 24 September 2015
ER -