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Summary In this paper, a design of the compensation network with a variable inductor is proposed, considering a wide variation of the coupling coefficient in the inductive power transfer (IPT). The characteristics of the proposed compensation network are analyzed with respect to the variable antenna coupling conditions. The realization of the zero voltage switching (ZVS) and the reactive power demand are discussed through the theoretical deduction and numerical simulation. Influence of the variable inductor on the compensation network characteristics is examined in detail, and the control algorithm for achieving the coupling independent constant output voltage is proposed. Detailed steps to design a prototype fulfilling all performance requirements are given. Verification of the proposed method was carried out on the experimental model. Recorded output voltage variation is within 5% over the wide coupling range, implying a quite well characteristic of the coupling independent voltage output. Experimental results match well with the calculations, validating the rightness of the proposed variable inductor tuning method.

The paper analyzes the consumption performance of DC current transformers based on linear class B, and half bridge classD compensation amplifiers, as well as self-oscillating flux gate current transformers based on push-pull and source–sink output stages.Compensation amplifiers, push-pull and source-sink output stages are used to generate feedback current in order to compensatemagnetic flux in the magnetic concentrator core, produced by electrical current flowing through a conductor under measurement. Thefocus of the analysis is the investigation of conditions for appearance of the bus-pumping effect to which all switching versions of DCcurrent transformers are prone. All sufficient conditions for bus pumping effect appearance are explained for the most critical case ofDC current measurement; the main issues are analyzed, giving better insight to power consumption, and possible hazards to DCcurrent transformer circuitry. It is highlighted the existence of particular exploitation conditions that lead to the state where the class Dbased DC transformers are inferior to conventional class B based counterparts. Finally, when a linear compensating amplifier isreplaced with a switching counterpart, it has been demonstrated that it is possible to expect a feasible improvement in energyconsumption in the middle of the ideal half-class D class and classical B class realisations.

IEEE 1451.0 standard defines common smart transducers characteristics and interfaces, as well as the electronic specification known as Transducer Electronics Data Sheet (TEDS). Introduction of Web services based on the IEEE 1451.0, further improves interoperability in smart transducers network. On the other side, energy consumption represents an important aspect in the transducer application and algorithm design, especially in the case of devices with battery power supply. In this paper, we propose a general TEDS format for low-power mode configuration, with independent activation/deactivation of device segments, and we describe how energy can be saved in the service-oriented smart transducers network. Test example is given in the form of service-oriented smart transducer with independent power control of temperature sensor channel.