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

Aboushady, A.A.; Ahmed, K.H.


A.A. Aboushady

K.H. Ahmed


This paper proposes a multi-loop controller for the 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.

Start Date Oct 19, 2014
Publication Date Jan 22, 2015
Publisher Institute of Electrical and Electronics Engineers
Pages 502-207
Institution Citation ABOUSHADY, A.A. and AHMED, K.H. 2014. Sensorless multi-loop control of phase-controlled series-parallel resonant converter. In Proceedings of the 3rd International conference on renewable energy research and applications (ICRERA 2014), 19-22 October 2014, Milwakuee, USA. Piscataway: IEEE [online], pages 502-507. Available from:
Keywords Large signal model; Phase control; Sensorless multiloop control; Series parallel resonant converter (SPRC)


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