Broadband Data Link


Broadband Data Link for Inductive Power Transfer Systems

During electronica 2014 in Munich, Creative Chips GmbH presented the result of a design study in which an inductive, bidirectional data transfer with a bandwidth of up to 10Mbit/s has been realized. The data transfer is in parallel to the power transmission through the same coil system. The introduced method can be used for high speed customer data transfer and  for the control of dynamic power transmission systems in all power ranges. Etatronix developed the components and the algorithm for the power transmission.


Energy transfer by near-field coupling 2014


Energy transfer by near-field coupling

The aim of this work is the examination of the energy transfer system in general, regardless of the type of coupling, by focussing on the essential, a high energy transmission capability with maximum efficiency. By determining these system parameters it is possible to characterize a variety of energy transmission systems and specify the transmission quality of each system. This allows an objective comparison of different energy transmission methods.

Since there are requirements to the connected load impedance and the power source for the realization of high energy transmission capability at maximum efficiency, it is shown how these are accomplishable by the use of matching networks. With the introduction of this matching networks, a practical realization is also presented. This article is published in german language.


A New Figure of Merit 2014


A New Figure of Merit and General Properties of Wireless Power Transmission Systems

Based on a generalized transmission system this work proposes a new figure of merit to overcome the inaccuracies of previous definitions. Based on the definition of the transmission quality factor we introduce the transmission bandwidth which will be very useful in the analysis and design of load matching networks optimized for maximum power transfer efficiency.


MEDengineering 2013


Convenient and clean

Particularly in medical technology, non-contact energy transmission offers a lot of advantages. But what is the difference between manufacturer-independent and proprietary solutions? This article is published in german language.

Link to press release


E&E Kompendium 2014


A standard for wireless energy

There has been a substantial increase in interest in non-contact energy transmission in recent times. The diversity of different technologies in their realization can lead to uncertainty, however, on the part of device manufacturers. This delays a rapid, blanket development of non-contact charging infrastructure which is a prerequisite for the market breakthrough in the consumer sector. This article is published in german language.

Link to press release


Applied Power Electronics Conference 2013


Digitally controlled synchronous bridge-rectifier for wireless power receivers

Reducing power loss in wireless power receivers is important to avoid thermal design issues. Synchronous rectification is a suitable means for loss reduction. In this paper we propose a synchronous rectifier with a simple control scheme. A detailed analysis leads to a time-domain model which is used to perform a power loss analysis. Experimental verification shows that the predicted efficiency improvement agrees with measurement results.

Link to press release


D&E Entwicklerforum 2010


Wireless energy supply of mobile devices by inductive near-field coupling

Non-contact energy supply of mobile devices by inductive near-field coupling – Thanks to its advantages, non-contact energy transmission has a wide application spectrum and has been in use for decades now with success. It can be used to increase convenience or to allow completely new applications. This article describes the basic physical principles and the technical limits of this technology. It explains why non-contact energy transmission can only be used at the moment efficiently and safely at short distances. The combination of power electronics and digital signal processing not only increases the energy-efficiency but also allows the provision of a stabilized voltage supply for the device being operated. This article is published in german language.


Link to press release


Power Electronics and Motion Control 2010


Inductive power transmission system with stabilized output voltage using local primary-and secondary-side control

In this paper, a primary and secondary series compensated inductive power transmission system with primary-side zero phase angle control and a loss-free clamp (LFC) circuit on the secondary-side is described. The effects of non-synchronous tuning are analyzed and intendet detuning is proposed to guarantee controllability. The functional principle of the LFC circuit, which is required for output voltage stabilization over a wide load range and varying magnetic coupling, is explained. Finally, theoretical results are verified experimentally.

Link to press release