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Design and Implementation of the Power Supply of the Wireless Neural Recording System using the Electromagnetic Induction Method

Ahmadi Nabi, Sajad | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57247 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Ghazizadeh Ehsaei, Ali; Ahmadi, Mohammad Mahdi
  7. Abstract:
  8. This research focuses on the development and implementation of a wireless power transfer system based on magnetic induction to power wireless neural recording devices in experiments where animals move freely in a cage. The main goal of this research is to reduce the weight of the recording devices by eliminating the battery and using wireless power transfer. By removing the battery and employing magnetic induction, the final weight of the device is minimized, eliminating the need for battery replacement or recharging, and reducing the negative impact of the device's weight on the natural activities of the test animals. Power transfer for wireless neural recording devices is achieved through the near-field magnetic power transfer method using transmitting and receiving coils tuned to resonance frequency. The transmitting coil is wrapped around the cage, and the receiving coil, which is much smaller in size compared to the transmitting coil, is placed on the head of the test animal and connected to the wireless neural recording device. To select the optimal transmitting and receiving coils, simulations were conducted to estimate the coupling coefficient between the transmitting and receiving coils inside the cage using COMSOL software. These simulations allowed the examination and adjustment of various parameters to choose the best transmitting and receiving coil. For validation, the simulation results were compared with practical results. Additionally, four coil models with different characteristics, including coils with varying diameters and numbers of turns, were examined. The results showed that a coil with a thinner wire diameter and more turns provides the best performance in power transfer and delivers the highest received voltage. This system can serve as a practical and efficient solution for power transfer in long-term experiments with small moving animals, enabling the practical and long-term use of wireless neural recording devices without movement limitations.
  9. Keywords:
  10. Electromagnetic Induction ; Near-Field Power Transfer ; Free Movement Neural Recording ; Wireless Neural Recording System ; Implantable System ; Electromagnetic Induction Power Transfer

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