A Switched-Capacitor-Based Quasi-H7 Inverter for Common-Mode Voltage Reduction

Thi-Thanh Nga Nguyen, Tan-Tai Tran, Minh-Duc Ngo () and Seon-Ju Ahn ()
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Thi-Thanh Nga Nguyen: Department of Automation, Thai Nguyen University of Technology (TNUT), 666, 3/2 Street, Tich Luong Ward, Thai Nguyen City 24132, Vietnam
Tan-Tai Tran: Faculty of Electrical Engineering Technology, Industrial University of Ho Chi Minh City, Ho Chi Minh City 71700, Vietnam
Minh-Duc Ngo: Department of Automation, Thai Nguyen University of Technology (TNUT), 666, 3/2 Street, Tich Luong Ward, Thai Nguyen City 24132, Vietnam
Seon-Ju Ahn: Department of Electrical Engineering, Chonnam National University, Buk-gu, Gwangju 61186, Republic of Korea

Energies, 2025, vol. 18, issue 12, 1-16

Abstract: This paper proposes a novel three-phase two-level DC-AC inverter with significantly reduced common-mode voltage. The proposed inverter combines a conventional three-phase H7 configuration with a voltage multiplier network, effectively doubling the DC-link voltage relative to the input. Compared to existing solutions, the topology achieves a remarkably low common-mode voltage, limited to only 16.6% of the DC-link voltage. Additionally, the voltage stress across the additional switches remains at half of the DC-link voltage. The paper details the operating principles, mathematical formulation, and circuit-level analysis of the proposed inverter. Simulation results are provided to validate its performance. Furthermore, a hardware prototype has been implemented using a DSP TMS320F28379D microcontroller manufactured by Texas Instruments, headquartered in Dallas, TX, USA in conjunction with an Altera Cyclone® IV EP4CE22F17C6N FPGA-based digital control platform manufactured by Intel Corporation, headquarters in Santa Clara, CA, USA. Experimental results are presented to confirm the effectiveness and feasibility of the proposed design.

Keywords: switched-capacitor network; common-mode voltage; H7 inverter; DC-AC inverter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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