Sze Sing Lee, Chee Shen Lim, Yam P. Siwakoti, and Kyo-Beum Lee, "Dual-T-Type 5-Level Cascaded Multilevel Inverter (DTT-5LCMI) with Double Voltage Boosting Gain," IEEE Transactions on Power Electronics, in press. -SCI > Paper

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International Journals Sze Sing Lee, Chee Shen Lim, Yam P. Siwakoti, and Kyo-Beum Lee, "Dual-T-Type 5-Level Cascaded Multilevel Inverter (DTT-5LCMI) with Double Voltage Boosting Gain," IEEE Transactions on Power Electronics, in press. -SCI

2020

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The switched-capacitor based cascaded multilevel inverters (SC-CMI) have been emerging due to their voltage boosting capability. Unfortunately, they suffers from impulse charging current and non-uniform operation. This paper presents a topology termed as Dual-T-Type 5-level cascaded multilevel inverter (DTT-5L-CMI) to resolve these problems without compromising the desirable voltage boosting characteristic. The main idea is to integrate a half-bridge and an inductor to soft-charge a capacitor which is connected in series with the DC source. The capacitor enables the voltage gain boosted to two, while the control of eight power switches that constitutes a dual-T structure enables five voltage levels generation. In addition, uniform operation is achieved for cascaded extensions. The operating principle of the proposed topology is analyzed and elaborated. For validation, simulation and experimental results of a prototype are presented. 

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