Indonesian Journal of Electrical Engineering and Computer Science Vol. 24, No. 2, November 2021, pp. 673~679 ISSN: 2502-4752, DOI: 10.11591/ijeecs.v24.i2.pp673-679  673 Journal homepage: http://ijeecs.iaescore.com A series-connected switched source and an H-bridge based multilevel inverter Siva Pachipala 1 , Amarsrinadh Guda 2 , Mentimi Sandeep Babu 3 , Veeranarayana B. 4 , K. V. S. Ramachandra Murthy 5 , Abhilash Tirupathi 6 1,2,3,4,5 Department of Electrical Engineering, Aditya Engineering College, Surampalem, India 6 Department of Electrical Engineering, Accendere Knowledge Management Services, CL Educate Ltd., New Delhi, India Article Info ABSTRACT Article history: Received Jan 7, 2021 Revised Aug 30, 2021 Accepted Sep 17, 2021 An inverter circuit is promoted in this paper, using series-connected switched dc sources along with an H-bridge circuit with optimized circuit elements like switching devices and diode clamped (DC) sources. This configuration uses DC supplies that can be strung together in series to create a significant voltage level. This topology consists of two parts, namely: 1) level production part and 2) polarity production part. The combination of some of the dc sources and switching devices completes the level production part. The H-bridge in the presented structure produces the polarity generation part. The DC-link capacitors are not needed in this design. There is a full presentation of the operating modes and modeling process of the proposed converter. Finally, in the MATLAB/SIMULINK setting the proposed topology is simulated and output current and voltage results have been examined. Keywords: H-bridge Multilevel inverter Pulse-width modulation This is an open access article under the CC BY-SA license. Corresponding Author: Abhilash Tirupathi Department of Electrical and Electronics Engineering Accendere Knowledge Management Services, CL Educate Ltd Anna Nagar West Extension, Chennai, Tamil Nadu 600101, India Email: abhilash.tripuathi@accendere.co.in 1. INTRODUCTION Series-connected switched diode clamped-anode clamped (DC-AC) converters are highly flexible and modular in the family of multilevel inverters. In this group, “cascaded H-bridge (CHB)” converters 11]-[3] are the classical and traditional types. CHB converters have the advantages of equal voltage stress in symmetrical configurations, easy to add/remove the H-bridges to increase/decrease the number of output voltage levels. Multi- layer insulation (MLI) technology is spreading to several areas such as AC drives, static reactive compensators, micro-grid systems and renewable energy sources [4]-[6]. The “neutral point clamped (NPC)” or “diode clamped (DC)”, “flying capacitor clamped (FCC)”, and CHB converters [7]-[9] are established as standard topologies in the MLI family. In these configurations, the device count increases exponentially w.r.t the number of levels in the output voltage, the requirement of unequal voltage ratings of the clamping diodes, unequal capacitor size and a greater number of dc sources puts limitations on these topologies. Several new MLI configurations with the intention of avoiding the drawbacks in the standard topologies were proposed in the literature for several applications [10], [11]. In recent times, cascaded converters are attracting attention from industries as well as academia. Several such “voltage source inverters (VSIs)” were proposed in the literature [12]-[15] by employing several combinations of switches, DC power supplies. The converter has the advantages of reducing the number of components and reduced blocking voltage over the switching units to reduce the cost. In this configuration, the rest of the paper is arranged is being as: section 2 describes work and operating modes, section 3 presents the