Passive auxiliary injection circuits for pulse tripling in three parallel-connected rectifiers

Md. Abdul Malek; A.S.M. Junayet Hossain

doi:10.1016/j.jnlest.2026.100360

Journal of Electronic Science and Technology ›› 2026, Vol. 24 ›› Issue (2) :100360 DOI: 10.1016/j.jnlest.2026.100360

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Passive auxiliary injection circuits for pulse tripling in three parallel-connected rectifiers

Md. Abdul Malek ^a^,^*
, A.S.M. Junayet Hossain ^b

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^a Department of Electrical & Electronic Engineering, Rajshahi University of Engineering & Technology, Rajshahi, 6204, Bangladesh

^b Department of Electrical & Electronic Engineering, East Delta University, Chattogram, 4209, Bangladesh

^* E-mail addresses: malek@eee.ruet.ac.bd (M.A. Malek),

junayet.h@eastdelta.edu.bd (A.J. Hossain).

Md. Abdul Malek was born in Chapai Nawabganj, Bangladesh in 1994. He received the B.Sc. and M.Sc. degrees in electrical & electronic engineering from Rajshahi University of Engineering & Technology (RUET), Rajshahi, Bangladesh in 2017 and 2021, respectively. He began his academic career as a Lecturer with Bangladesh Army University of Science and Technology (BAUST), Saidpur, Bangladesh in 2018. In 2019, he joined RUET as a Lecturer. Since 2022, he has been serving as an Assistant Professor with RUET. His research interests include power electronics, multipulse rectifier systems, power quality improvement, high-voltage engineering, and renewable energy systems.

A. S. M. Junayet Hossain received the B.Sc. degree in electrical & electronic engineering from RUET in 2024. He is currently working with the Department of Electrical & Electronic Engineering, East Delta University (EDU), Chattogram, Bangladesh, as a Lecturer. His research interests include power electronics, electric vehicle systems, grid connected systems, harmonic mitigation techniques, and renewable energy systems.

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Abstract

This paper proposes two types of passive auxiliary injection circuits (PAICs) that enable pulse tripling in three parallel-connected rectifiers, addressing the limitation of pulse multiplication to a factor of 2. The proposed design combined three rectifier units with two PAICs consisting of a delta/star transformer and nine auxiliary diodes. By further integrating the PAICs with conventional topologies such as 3-pulse star, 6-pulse star, 6-pulse bridge, 18-pulse star, and 18-pulse bridge rectifiers, we constructed 9-pulse star, 18-pulse star, 18-pulse bridge, 54-pulse star, and 54-pulse bridge configurations, respectively. The validation in MATLAB/Simulink demonstrated that these configurations achieved a threefold increase in both output-voltage pulses and input-current steps without the need for complex phase-shifting transformers. Moreover, the total harmonic distortion of the input current was significantly reduced, with values of 12.63%, 3.66%, 3.43%, 2.24%, and 1.90% for the respective designed rectifiers. To the best of our knowledge, this is the first demonstration of a passive pulse-tripling circuit for three parallel-connected rectifiers, offering a simple solution for high-current industrial applications.

Keywords

Harmonic reduction / Multipulse rectifier / Passive auxiliary injection circuit / Rectifier / Total harmonic distortion

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Md. Abdul Malek, A.S.M. Junayet Hossain. Passive auxiliary injection circuits for pulse tripling in three parallel-connected rectifiers. Journal of Electronic Science and Technology, 2026, 24 (2) : 100360 DOI:10.1016/j.jnlest.2026.100360

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Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Appendix A. Supplementary data

Supplementary data to this article can be found online at https://doi.org/10.1016/j.jnlest.2026.100360.

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