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Abstract-A system for wireless power transfer of microsystems in-vivo implantable in small animals is presented. The described solution uses a servo-controlled transmitter moved under the animal moving space. The solution minimizes the power irradiation while enabling animal speeds up to 30 cm/s. An x-y movable magnetic coil transmits the required power with a level able to keep constant the received energy. A permanent magnet on board of the implantable micro-system and an array of magnetic sensors form a coil tracking system capable of an alignment accuracy as good as 1 cm. The power is transferred over the optimized remote powering link at 13.56 MHz. The received ac signal is converted to dc voltage with a passive fullwave integrated rectifier and the voltage regulator supplies 1.8 V for the implantable sensor system. Experimental measurement on a complete prototype verifies the system performance.Index Terms-Remote powering, wireless power transfer, implantable electronics, multi-sensor system, monitoring system, implantable micro-system, servo-controlled power transfer, x-y rails, biomedical implant, system for freely moving animal, remotely powered sensor systems, in-vivo implantable system.

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DESCRIPTION. Energy and Buildings is an international journal publishing articles with explicit links to energy use in buildings. The aim is to present new research results, and new proven practice aimed at reducing the energy needs of a building and improving indoor environment quality. Topics covered include: Energy demands and consumption in existing and future buildings-prediction and validation Indoor environment quality, including health and thermal comfort vis-à-vis energy Natural, mechanical and mixed ventilation Air distribution in buildings Application of solar and other renewable energy sources in buildings Energy balances in building complexes (residential, commercial, industrial, public and other buildings) Energy efficiency improvement measures of HVAC&R and other technical systems in residential, commercial, public and industrial buildings, and semi open built spaces Heat recovery systems in buildings Buildings and district heating and cooling Energy conservation in built environment Energy efficient buildings Building physics Energy sustainability, resilience and climate adaptability of buildings Evaluation and control of indoor thermal and lighting systems Building's total performance and intelligent buildings Links between architectural design, mechanical and lighting systems New materials in buildings and their impact on energy demands External and internal design conditions for energy efficient buildings Building envelope materials and structure energy performance Thermal energy storage and thermally active building systems-TABS Energy performance of buildings and modeling predictive control Zero CO2 emission-zero energy and energy plus buildings and their smart grid harmonized operation Residential/municipal energy refurbishment and renovation Life cycle energy efficiency of buildings and embodied energy Architectural structure-construction energy efficiency Energy related aspects of buildings after catastrophic events Papers with results based on simulations are welcome but those with clear links to laboratory or field measurements are preferred. These links may include calibration, benchmarking, or comparisons of results.

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