Demodulation Type Single-Phase PLL with DC Offset Rejection

Hafiz Ahmed, Mohamed Benbouzid

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)
127 Downloads (Pure)


This Letter proposes demodulation type PLL for phase and frequency estimation of single-phase system that can reject DC offset. Using results from the adaptive estimation literature, this Letter proposes a linear parametric model-based initial phase angle estimation approach. Then by using differentiation and integration operation on the estimated initial phase angle, the frequency is estimated. This avoids the use of any low-pass filter unlike conventional demodulation- based technique. Moreover, unlike existing demodulation-based technique, the proposed technique can completely reject DC offset. Comparative experimental results, provided with state-of-the-art DC offset rejection-based enhanced phase locked-loop, clearly demonstrate the suitability of the proposed technique.

Original languageEnglish
Pages (from-to)344-347
Number of pages4
JournalElectronics Letters
Issue number7
Early online date10 Jan 2020
Publication statusPublished - 30 Mar 2020

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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