Time dependency of current harmonics for switch-mode power supplies

Muhammad Naveed Iqbal*, Lauri Kütt, Bilal Asad, Toomas Vaimann, Anton Rassõlkin, Galina L. Demidova

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)
12 Downloads (Pure)


This paper presents the time-dependent variance in the current harmonics emission by power supplies during power quality measurements. Power quality problems are becoming more significant with the adoption of power electronic-based circuits such as power supplies. The switch-mode power supplies are widespread as industrial, commercial, and domestic electrical loads. They draw non-sinusoidal current from the utility and inject current harmonics. Therefore, they are the reason for poor power quality and reduction in the power factor. The current harmonics emission from these power supplies depends on the circuit topology, operating conditions, and filter inside them. The harmonic emission estimations are critical for network operators; however, various uncertainties have made it a complicated task. The time-dependent stability affects the magnitude and phase angle of the harmonic current measurements and estimation of power quality indices. This paper investigates the variation in current harmonics emitted by the power supply during the initial unstable period under constant load and operating conditions.

Original languageEnglish
Article number7806
Number of pages12
JournalApplied Sciences (Switzerland)
Issue number21
Publication statusPublished - 1 Nov 2020
MoE publication typeA1 Journal article-refereed


  • Current harmonics
  • Power quality
  • Switched-mode power supplies
  • Thermal stability
  • Total harmonic distortion


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