OICC Press Majlesi Journal of Electrical Engineering 2345-3796 19 1 (March 2025) 2025 03 01 Nine switch converter as promising technology to improve efficiency of power electronic equipment 10.57647/j.mjee.2025.1901.06 EN Pooya Parvizi Department of Mechanical Engineering, University of Birmingham, Edgbaston, United Kingdom https://orcid.org/0000-0001-5939-8015 Alireza Mohammadi Amidi Department of Electrical Engineering, Razi University, Kermanshah  AND  Pooya Power Knowledge Enterprise, Tehran, Iran https://orcid.org/0009-0008-9056-5414 Milad Jalilian Department of Physics, Faculty of Science, Lorestan University, Khorramabad  AND  Pooya Power Knowledge Enterprise, Tehran, Iran https://orcid.org/0000-0002-6961-7338 Mohammad Reza Zangeneh Department of Energy, Shahid Beheshti University  AND  Pooya Power Knowledge Enterprise, Tehran, Iran https://orcid.org/0009-0005-4646-8316 Journal Article 2025 03 01 Nine switch converters (NSCs) are power electronic devices that utilize nine power switches to convert electrical energy from one form to another. These converters are commonly used in various applications within the power industry. In fact, this type of converter is a multi-port power electronic device that consists of two three-phase terminals and a DC link, similar to the twelve-switch back-to-back (BTB) converter. However, it distinguishes itself by reducing the number of active switches by 25%. Nine switch converters offer several advantages over traditional converters. They can provide improved efficiency, reduced harmonic distortion and enhanced control capabilities. Additionally, they can handle higher power levels and operate at higher frequencies, making them suitable for a wide range of power industry applications. Furthermore, they are cost-effective, compact, and adaptable to higher power levels. By distributing voltage and current across fewer switches, the overall stress on individual components is reduced, which can enhance the lifespan and reliability of the converter. This paper summarizes the various utilizations of NSCs in modern power systems and briefly reviews the related challenges and future prospects.