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Analysis and investigations of inductive power transfer (IPT) systems in terms of efficiency and magnetic field distribution properties

Miśkiewicz R. M., Anczewski P., Moradewicz A. J.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2019

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Vol. 67, nr 4

789--797

EN

The problems connected to developing inductive power transfer IPT systems in aspects of high efficiency and suppression of electromagnetic field (EMF) emission are discussed. It is shown how important it is to compensate for large leakage impedance of IPT coils (air transformer) to improve efficiency of high power transfer. Such compensation circuits operating with resonant frequencies at soft switching conditions additionally allow for reduction of switching losses in power semiconductor devices of converters. The consideration has been illustrated and verified by experimental results measured on two different test stands (50 kW with planar coils and with two 12 kW receiver coils) built in a laboratory of the Łukasiewicz Research Network – Electrotechnical Institute.

2

Robust H∞ output feedback control of bidirectional inductive power transfer systems

Swain A., Almakhles D., Neath M. J., Nasiri A.

Archives of Control Sciences

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2017

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Vol. 27, no. 1

41--62

EN

Bidirectional Inductive power transfer (IPT) systems behave as high order resonant networks and hence are highly sensitive to changes in system parameters. Traditional PID controllers often fail to maintain satisfactory power regulation in the presence of parametric uncertainties. To overcome these problems, this paper proposes a robust controller which is designed using linear matrix inequality (LMI) techniques. The output sensitivity to parametric uncertainty is explored and a linear fractional transformation of the nominal model and its uncertainty is discussed to generate a standard configuration for μ-synthesis and LMI analysis. An H∞ controller is designed based on the structured singular value and LMI feasibility analysis with regard to uncertainties in the primary tuning capacitance, the primary and pickup inductors and the mutual inductance. Robust stability and robust performance of the system is studied through μ-synthesis and LMI feasibility analysis. Simulations and experiments are conducted to verify the power regulation performance of the proposed controller.

3

FEM analysis of couplers for inductive power transfer

Fuchs A., Schmidt H-P.

Przegląd Elektrotechniczny

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2014

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R. 90, nr 12

120--122

EN

Couplers for inductive power transfer are studied via 3-D FEM analysis. Field and lumped parameter calculations are coupled and an Nport model is developed to describe the system. Applications of such couplers and systems are contact less charging units of electric vehicles, sensors or actors in factory automation and intra-logistics. Stray fields and shielding effects are considered. It is shown that an aluminium sheet metal may be beneficially used to reduced field levels in surrounding iron structures and to reduce losses.

PL

W artykule zaprezentowano analizę metodą elementów skończonych przesyłu mocy indukcyjnej. Obliczenia parametrów polowych i skupionych są sprzężone i do opisania tego systemu opracowano N-wejściowy model. Takie sprzęgacze i systemy znajdują zastosowanie w bezdotykowym ładowaniu pojazdów elektrycznych, sensorach i aktuatorach w automatyce przemysłowej oraz w logistyce. Rozważono pole rozproszenia i efekty ekranowania. Zostało pokazane, że blacha aluminiowa może być skutecznie użyta do redukcji poziomu pola w elementach konstrukcyjnych ferromagnetycznych, a co za tym idzie do zmniejszenia strat.