Digitized self-oscillating loop for piezoelectric transformer-based power converters

Marzieh Ekhtiari, Thomas Andersen, Zhe Zhang, Michael A. E. Andersen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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A new method is implemented in designing of self-oscillating loop for driving piezoelectric transformers. The implemented method is based on combining both analog and digital control systems. Digitized delay, or digitized phase shift through the self-oscillating loop results in a very precise frequency control and ensures an optimum operation of the piezoelectric transformer in terms of
voltage gain and efficiency. In this work, additional time delay is implemented digitally for the first time through 16 bit digital-to-analog converter to the self-oscillating loop. Delay control setpoints updates at a rate of 417 kHz. This allows the control loop to dynamically follow frequency changes of the transformer in each resonant cycle. The operation principle behind self-oscillating is discussed in
this paper. Moreover, experimental results are reported.
Original languageEnglish
Title of host publicationProceedings of IEEE Applied Power Electronics Conference 2016
Publication date2016
ISBN (Print)978-1-4673-9550-2
Publication statusPublished - 2016
Event2016 IEEE Applied Power Electronics Conference and Exposition - Long Beach Convention & Entertainment Center, Long Beach, United States
Duration: 20 Mar 201624 Mar 2016
Conference number: 31


Conference2016 IEEE Applied Power Electronics Conference and Exposition
LocationLong Beach Convention & Entertainment Center
Country/TerritoryUnited States
CityLong Beach
Internet address


  • Optimum delay line
  • Self-oscillating loop
  • Phase shift
  • Switch-mode power supply
  • zero-voltage switching
  • Piezoelectric transformer


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