Exposure Evaluation
dasyvisual.jpg
Wireless Power Transfer









a

Induced electric field distribution on Ella’s body due to WPT system for charging electric vehicle.























b

Streamline of WPT generated magnetic field for charging electric vehicles.













c

WPT charging of pacemaker inside the Virtual Skeleton Database (VSD) model and a slice through the resulting induced current density.

Wireless Power Transfer

 
Expertise & Infrastructure

Wireless power transfer (WPT) systems in use today apply operational frequencies ranging from a few kHz up to several tens of GHz and expose users and bystanders to highly inhomogeneous fields. Together with industry partners, IT'IS is developing the next generation of dosimetric probes and measurement techniques to accurately test compliance with current safety guidelines to prevent from short-term health effects of nerve stimulation and tissue heating.

IT’IS Foundation has detailed knowledge about the intricacies of regulatory agencies and the corresponding processes due to their active participation and membership in IEC/ISO standard groups. We support different tiers of compliance assessment: faster, less demanding tests apply more conservative limits to ensure device safety, while more rigorous, comprehensive testing can more precisely determine the exposure and allow less conservative limits to be applied.

The group’s exposure assessment laboratories are equipped with the most advanced tools including the cSARD6 and cSAR3D (left/right/flat/quad), the latest DASY6 RX90L with DASY52NEO licenses, and a wide range of specialized probes. With more than 100 SemCAD/Sim4Life licenses, including the Virtual Population 3.x and multiple animal models, and several High Performance Computers (HPC) ranging from Graphics Processing Unit (GPU) clusters to supercomputers, our interdisciplinary research team can tackle highly specific and complex research tasks with superior innovation and efficiency – while ensuring compliance to national and international standards.

 

Select Customized Research Projects of the Past Years
  • Contributed significantly to WPT safety regulation, notably IEC TC106 WG9;
  • Developed calibration and assessment procedures for static and dynamic WPT systems for the inductive charging of electric vehicles, as part of the EMPIR project MICEV;
  • Extension of implant safety at WPT frequencies: development of a general and conservative mechanistic theory to prevent both thermal effects and nerve stimulation;
  • Collaborated with major automotive and mobile manufacturers for numerical WPT safety analyses.

Collaboration with SPEAG for:

  • Developement of customized probes for fast compliance testing with basic restrictions down to 3 kHz;
  • Extension of existing SAR, E-field and H-field probes down to 1 MHz;
  • Development of SAR probe for liquid measurements down to 80 kHz.
Solutions Beyond State-of-the-Art

Currently, the development and regulation of safety testing of WPT systems for human exposure is in an early stage, and no readily applicable evaluation protocols are available. Looking forward, it is important to continue to protect higher-risk populations, such as patients with medical implants or impaired thermoregulation, without resorting to overly conservative risk estimates which stifle innovation and technological progress. The IT'IS Foundation is committed to expanding its WPT safety activities collectively with potential partners. We support our partners through the entire development process, from device design to regulatory approval, including measurements, simulations, reporting, and communication with regulatory bodies.

 

Contact

We look forward to discussing with you how we can best support your R&D initiatives and regulatory submissions – simply call us at +41 44 245 96 96 or send us an email at customized@itis.swiss.

 

RELEVANT PUBLICATIONS

Nadakuduti, J., Douglas, M., Lu, L., Christ, A., Guckian, P. & Kuster, N. Compliance Testing Methodology for Wireless Power Transfer Systems. IEEE Transactions on Power Electronics, 30(11):6264-6273, 2015
Chen, X.L., Umenei, A., Baarman, D., Chavannes, N., De Santis, V., Mosig, J. & Kuster, N. Human Exposure to Close-Range Resonant Wireless Power Transfer Systems as a Function of Design Parameters. IEEE Transactions on Electromagnetic Compatibility, 56(5):1027-1034, 2014
Christ, A., Douglas, M., Nadakuduti, J. & Kuster, N. Assessing Human Exposure to Electromagnetic Fields from Wireless Power Transmission Systems. Proceedings of the IEEE, 101(6):1482-1493, 2013
Christ, A., Douglas, M., Roman, J., Cooper, E., Sample, A., Smith, J., Waters, B. & Kuster, N. Evaluation of Wireless Resonant Power Transfer Systems with Human Electromagnetic Exposure Limits. IEEE Transactions on Electromagnetic Compatibility, 55(2):265-274, 2013