Voltage-Sensorless Control and GaN Multilevel Converter for Charging Non-Linear and Lossy Electrocaloric Capacitors
Conference: CIPS 2024 - 13th International Conference on Integrated Power Electronics Systems
03/12/2024 - 03/14/2024 at Düsseldorf, Germany
Proceedings: ETG-Fb. 173: CIPS 2024
Pages: 6Language: englishTyp: PDF
Authors:
Moench, Stefan (Fraunhofer Institute for Applied Solid State Physics IAF, Freiburg, Germany & Institute of Electrical Energy Conversion IEW, University of Stuttgart, Germany)
Reiner, Richard; Basler, Michael (Fraunhofer Institute for Applied Solid State Physics IAF, Freiburg, Germany)
Waltereit, Patrick (Institute of Electrical Energy Conversion IEW, University of Stuttgart, Germany)
Quay, Ruediger (Fraunhofer Institute for Applied Solid State Physics IAF, Freiburg, Germany & Department for Sustainable Systems Engineering (INATECH), Albert Ludwigs University of Freiburg, Germany)
Bartholome, Kilian (Fraunhofer Institute for Physical Measurement Techniques IPM, Freiburg, Germany)
Abstract:
This work presents the control and operation of a highly-efficient GaN multilevel converter for cyclic charging and discharging of lossy and non-linear capacitive loads without additional voltage sensor. A hysteretic inductor current control with efficient zero voltage switching is used to achieve high power conversion efficiency. The transitions between the multiple input voltage levels are triggered by a voltage-sensorless timing circuit. The maximum expected switching period during hysteretic current control is calculated based on LC-circuit analysis and detected by a timeout circuit. The control system is implemented on a programmable system on chip (PSoC), and verified with a GaN-based six-level converter and electrocaloric, non-linear and lossy capacitive load of around 10 muF by 240 V.