Open Access Open Access  Restricted Access Subscription or Fee Access

A Transformer-based Multilevel Inverter with Lesser Components

Aravind Venugopal, Phejil K. Paul


This paper presents a multilevel inverter topology with lesser number of components than a conventional multilevel inverter, thereby reducing the overall cost of the same. Here, a nine-level transformer-based multilevel inverter topology is proposed which uses only 8 switches while a conventional transformer-less multilevel inverter uses 16 switches for achieving the same voltage level. The structure consists of a single dc source feeding two standard H-bridges. The process of intermediate voltage regulation is achieved by a single transformer. To derive the gating pulses, a pulse width modulation scheme is used. Also, only a single dc source is used. The proposed inverter is validated using simulated results and a down-scale prototype of the same is also built. Furthermore, an effortless extension of the proposed inverter to a higher number of voltage levels is also possible.


Multilevel inverters; pulse width modulation; standard H-Bridges

Full Text:



L. M. Tolbert, F. Z. Peng, and T. G. Habetler, “Multilevel converters for large electric drives,” IEEE Trans.on Ind. Appl., vol. 35, no. 1, pp. 36–44, 1999.

J.-S. Lai and F. Z. Peng, “Multilevel converters-a new breed of power converters,” IEEE Trans. on Ind. Appl., vol. 32, no. 3, pp. 509–517, 1996.

L. G. Franquelo, J. Rodriguez, J. I. Leon, S. Kouro, R. Portillo, and M. A. Prats, “The age of multilevel converters arrives,” IEEE Ind. Electron. Mag., vol. 2, no. 2, pp. 28–39, 2008.

J. Rodriguez, J.-S. Lai, and F. Z. Peng, “Multilevel inverters: a survey of topologies, controls, and applications,” IEEE Trans. Ind. Electron., vol. 49, no. 4, pp. 724–738, 2002.

A. Nabae, I. Takahashi, and H. Akagi, “A new neutral-point-clamped pwm inverter,” IEEE Trans. Ind. Appl., no. 5, pp. 518–523, 1981.

N. Sandeep and R. Y. Udaykumar, “Design and implementation of a sensorless multilevel inverter with reduced part count,” IEEE Trans. Power Electron., vol. 32, no. 9, pp. 6677–6683, 2017.

N. Sandeep and U. R. Yaragatti, “Operation and control of an improved hybrid nine-level inverter,” IEEE Trans. on Ind. Appl., vol. 53, no. 6, pp. 5676–5686, 2017.

N. Sandeep and R. Y. Udaykumar, “Operation and control of a ninelevel modified anpc inverter topology with reduced part count for gridconnected applications,” IEEE Trans. on Ind. Electron., vol. 65, no. 6, pp. 4810–4818, 2018.

N. Sandeep and U. R. Yaragatti, “A switched-capacitor-based multilevel inverter topology with reduced components,” IEEE Trans. Power Electron., vol. 33, no. 7, pp. 5538–5542, July 2018.

Z. Li, P. Wang, Y. Li, and F. Gao, “A novel single-phase five-level inverter with coupled inductors,” IEEE Trans. on Power Electron., vol. 27, no. 6, pp. 2716–2725, 2012.

J. P. R. A. M´ello and C. B. Jacobina, “Single-phase converter with shared leg and generalizations,” IEEE Trans. on Power Electron., 2017.

S. Daher, J. Schmid, and F. L. Antunes, “Multilevel inverter topologies for stand-alone pv systems,” IEEE Trans. Ind. Electron., vol. 55, no. 7, pp. 2703–2712, 2008.

M. R. Banaei, H. Khounjahan, and E. Salary, “Single-source cascaded transformers multilevel inverter with reduced number of switches,” IET Power Electron., vol. 5, no. 9, pp. 1748–1753, 2012.

A. Farakhor, R. R. Ahrabi, H. Ardi, and S. N. Ravadanegh, “Symmetric and asymmetric transformer based cascaded multilevel inverter with minimum number of components,” IET Power Electron., vol. 8, no. 6, pp. 1052–1060, 2015.

F.-s. Kang, “A modified cascade transformer-based multilevel inverter and its efficient switching function,” Electr. Power Syst. Res., vol. 79, no. 12, pp. 1648–1654, 2009.

M. Banaei and E. Salary, “A new family of cascaded transformer six switches sub-multilevel inverter with several advantages,” Journal of Electrical Engineering and Technology, vol. 8, no. 5, pp. 1078–1085, 2013.

H. Khounjahan, M. Banaei, and A. Farakhor, “A new low cost cascaded transformer multilevel inverter topology using minimum number of components with modified selective harmonic elimination modulation,” Ain Shams Engineering Journal, vol. 6, no. 1, pp. 67–73, 2015.

A. A. Gandomi, S. Saeidabadi, S. H. Hosseini, E. Babaei, and M. Sabahi, “Transformer-based inverter with reduced number of switches for renewable energy applications,” IET Power Electron., vol. 8, no. 10, pp. 1875–1884, 2015.

S. Behara, N. Sandeep, and R. Y. Udaykumar, “Transformer-based seven-level inverter with single-dc supply for renewable energy applications,” in Power Electronics (IICPE), 2016 7th India International Conference on. IEEE, 2016, pp. 1–6.

S. Behara, N. Sandeep, and U. R Yaragatti, “A simplified transformer-based multilevel inverter topology and generalizations for renewable energy applications,” IET Power Electron., vol. 11, no. 4, pp. 708–718, 2018.

N. Sandeep, P. Salodkar, and P. S. Kulkarni, “A new simplified multilevel inverter topology for grid-connected application,” in Proc. 2014 IEEE Elect., Electron. Comput. Sci.,, 2014, pp. 1–5.

Cite this Article

Aravind Venugopal, Phejil K. Paul.

A Transformer-based Multilevel Inverter with Lesser Components. Journal of Microelectronics and Solid-State Devices. 2019; 6(2): 1–12p


  • There are currently no refbacks.

Copyright (c) 2019 Journal of Microelectronics and Solid State Devices