Sensorless multi-loop control of phase-controlled series-parallel resonant converter

A.A. Aboushady, K.H. Ahmed

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)
67 Downloads (Pure)


This paper proposes a multi-loop controller for phase-controlled series-parallel resonant converter. Output voltage is solely measured for control and inner loop is used to enhance closed loop stability and dynamic performance compared to single-loop control. No additional sensors are used for inner loop variables. These are estimated using a Kalman filter, based on a linearized converter model. The advantage of this sensorless scheme is not only reducing the number of sensors but more significantly providing an alternative to sensing high frequency resonant tank variables which require high microcontroller resolution in real time. First, the converter non-linear large signal behavior is linearized using a state feedback based scheme. Consequently, the converter preserves its large signal characteristics while modeled as a linear system. Comparison is made between the most suitable state variables for feedback, according to a stability study. Finally, simulation and experimental results are demonstrated to validate the improved system performance in contrast with single-loop control.
Original languageEnglish
Title of host publication2014 International Conference on Renewable Energy Research and Application (ICRERA)
Number of pages6
ISBN (Electronic)978-1-4799-3795-0
ISBN (Print)9781479937950
Publication statusPublished - 2014


  • voltage control
  • kalman filters
  • pi control
  • transfer functions
  • voltage measurement
  • stability analysis
  • integrated circuit modeling


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