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Sensorless BCM control for a bidirectional flyback-converter

Transducers based on dielectric elastomers (DE) represent capacitive loads from an electrical point of view. Thus, for an efficient operation of these transducers tailored power electronics are required, preferable with bidirectional energy flow to improve the energy efficiency. Therefore, in this contribution a bidirectional flyback-converter is modeled in order to design the control. Since the superimposed application-oriented control of the DE transducer requires an accurate inner control of the utilized converter, a model of the flyback-converter feeding capacitive loads is carried out under consideration of losses. Based on this a sensor-less current control is developed that operates the converter in boundary conduction mode enabling the highest possible dynamics. This control can be superimposed e.g. by a voltage control. Finally, the obtained control approaches are experimentally validated by measurements with a realized prototype of the bidirectional flyback-converter.