TY - JOUR
T1 - Switched-Capacitor Multilevel Inverters
T2 - A Comprehensive Review
AU - Barzegarkhoo, Reza
AU - Forouzesh, Mojtaba
AU - Lee, Sze Sing
AU - Blaabjerg, Frede
AU - Siwakoti, Yam P.
PY - 2022/9
Y1 - 2022/9
N2 - Multilevel inverters (MLIs) with switched-capacitor (SC) units have been a widely rehearsed research topic in power electronics since the last decade. Inductorless/transformerless operation with voltage-boosting feature and inherent capacitor self-voltage balancing performance with a reduced electromagnetic interference make the SC-MLI an attractive converter over the other available counterparts for various applications. There have been many developed SC-MLI structures recently put forward, where different basic switching techniques are used to generate multiple (discrete) output voltage levels. In general, the priority of the topological development is motivated by the number of output voltage levels, overall voltage gain, and full dc-link voltage utilization, while reducing the component counts and stress on devices for better efficiency and power density. To facilitate the direction of future research in SC-MLIs, this article presents a comprehensive review, critical analysis, and categorization of the existing topologies. Common fundamental units are generalized and summarized with their merits and demerits. Ultimately, major challenges and research directions are outlined leading to the future technology roadmap for more practical applications.
AB - Multilevel inverters (MLIs) with switched-capacitor (SC) units have been a widely rehearsed research topic in power electronics since the last decade. Inductorless/transformerless operation with voltage-boosting feature and inherent capacitor self-voltage balancing performance with a reduced electromagnetic interference make the SC-MLI an attractive converter over the other available counterparts for various applications. There have been many developed SC-MLI structures recently put forward, where different basic switching techniques are used to generate multiple (discrete) output voltage levels. In general, the priority of the topological development is motivated by the number of output voltage levels, overall voltage gain, and full dc-link voltage utilization, while reducing the component counts and stress on devices for better efficiency and power density. To facilitate the direction of future research in SC-MLIs, this article presents a comprehensive review, critical analysis, and categorization of the existing topologies. Common fundamental units are generalized and summarized with their merits and demerits. Ultimately, major challenges and research directions are outlined leading to the future technology roadmap for more practical applications.
KW - Multilevel inverter (MLI)
KW - pulsewidth modulation (PWM)
KW - self-voltage balancing
KW - step-up switched-mode dc–ac converters
KW - switched capacitor (SC)
UR - http://www.scopus.com/inward/record.url?scp=85127746637&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2022.3164508
DO - 10.1109/TPEL.2022.3164508
M3 - Review article
SN - 0885-8993
VL - 37
SP - 11209
EP - 11243
JO - I E E E Transactions on Power Electronics
JF - I E E E Transactions on Power Electronics
IS - 9
M1 - 9748987
ER -