The increasing demand on battery-powered electronic devices fosters the need for innovative solutions for the power and battery management of these systems. It is a common situation that the battery of our smartphone runs low quite fast and we have to recharge it several times a day. This comes from the fact that today’s batteries often constitute the bottleneck in the design of mobile devices. Wireless power transfer is an emerging technology which allows engineers to completely “cut the wire” and create a remarkable new user experience. Since the battery of our smartphone is constantly recharged whenever the device is placed on the wireless charger that could be seamlessly integrated in a piece of furniture, e.g. an office desk, we do not even recognize that the phone is recharged.
Ph.D. Project Facts
ISP Research Team
Mario Huemer, opens an external URL in a new window
Sept. 2013 - June 2016
A typical wireless power transfer system consists of a transmitter, generating a magnetic field, and a receiver, utilizing the transmitted energy to charge e.g. the battery of a smartphone. The achievable efficiency depends on physical quantities, i.e. the distance and alignment between the coils, and the utilized electrical power processing. To improve the system performance a sophisticated control algorithm has been developed, which is able to increase the power transfer efficiency by modulating the phase-shift and the output voltage amplitude of the active rectifier in the receiver. Additionally, the developed control approach enables increases in the amount of extractable output power and consequently the possible operation distance between transmitter and receiver by a substantial amount.
The research focus of this Ph.D. project is the modelling, control and optimization of wireless power transfer systems in the low to medium power range up to 15W, which is perfectly suited for charging devices like smartphones and tablet computers.
11) Berger A., Agostinelli M., Sandner C., Vesti S., Huemer M.: "High Efficient Integrated Power Receiver for a Qi Compliant Wireless Power Transfer System", in Proceedings of the IEEE Wireless Power Transfer Conference (WPTC 2016), IEEE, 2016.
10) Berger A., Agostinelli M., Vesti S., Oliver J., Cobos J., Huemer M.: "A Wireless Charging System Applying Phase-Shift and Amplitude Control to Maximize Efficiency and Extractable Power", in: IEEE Transactions on Power Electronics, Volume 30, Number 11, Page(s) 6338-6348, 2015, Open Access, opens an external URL in a new window.
9) Unterrieder C., Zhang C., Lunglmayr M., Priewasser R., Marsili S., Huemer M., "Battery state-of-charge estimation using approximate least squares", In Journal of Power Sources, Volume 278, 15 March 2015, Pages 274-286, (ISSN 0378-7753), Open Access, opens an external URL in a new window.
8) Berger A., Agostinelli M., Priewasser R., Marsili S., Huemer M.: "Unified Digital Sliding Mode Control with Inductor Current Ripple Reconstruction for DC-DC Converters", in: Proceedings of the International Symposium on Circuits and Systems (ISCAS 2015), Page(s) 213-216, IEEE, 2015.
7) Pathuri Bhuvana V., Huemer M., Tonello A.: "Battery Internal State Estimation Using a Mixed Kalman Cubature Filter", in: Proceedings of the IEEE International Conference on Smart Grid Communications (SmartGridComm 2015), 2015.
6) Berger A., Agostinelli M., Vesti S., Oliver J., Cobos J., Huemer M.: "Phase-Shift and Amplitude Control for an Active Rectifier to Maximize the Efficiency and Extracted Power of a Wireless Power Transfer System", in: Proceedings of the IEEE Applied Power Electronics Conference and Exposition (APEC 2015), Page(s) 1620-1624, 2015.
5) C. Unterrieder, M. Lunglmayr, S. Marsili and M. Huemer, ”Battery State-of-Charge Estimation Prototype using EMF Voltage Prediction,” accepted at the IEEE International Symposium on Circuits and Systems (ISCAS), Melbourne, Australia, June 2014. Accepted Version, opens a file
4) Robert Priewasser, Matteo Agostinelli, Christoph Unterrieder, Stefano Marsili, Mario Huemer, “Modeling, Control and Implementation of DC-DC-Converters for Variable Frequency Operation,” In the IEEE Transactions on Power Electronics, Vol. 29, No. 1, pp. 287-301, January 2014 (ISSN: 0885-8993, DOI: 10.1109/TPEL.2013.2248751 ) Open Access, opens an external URL in a new window.
3) Christoph Unterrieder, Robert Priewasser, Stefano Marsili, Mario Huemer, “Battery state estimation using mixed Kalman/H-infinity, adaptive Luenberger and sliding mode observer,” In the Proceedings of the IEEE Vehicle Power and Propulsion Conference (VPPC’ 2013), Beijing, China, pp. 71-76, October 2013. Accepted Version, opens a file
2) Venkata Pathuri Bhuvana, Christoph Unterrieder, Mario Huemer, “Battery Internal State Estimation: A Comparative Study of Non-Linear State Estimation Algorithms,” In the Proceedings of the IEEE Vehicle Power and Propulsion Conference (VPPC’ 2013), Beijing, China, vol., no., pp.1-6,October 2013.
1) Andreas Berger, Matteo Agostinelli, Robert Priewasser, Stefano Marsili, Mario Huemer, “Universal Digital Sliding Mode Control for DC-DC Converters, opens an external URL in a new window,” In the Proceedings of Austrochip 2013, Linz, Austria, pp. 23-28, October 2013.