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Regulating 3D Magnetic Flux Density for Stable Wireless Power Transfer in a Compact Planar Charger for Capsule
IEEE Transactions on Biomedical Circuits and Systems
|June 19, 2025
Summary
This study introduces a compact, omnidirectional wireless power transmitter for small devices like wearables and medical implants. The novel design ensures stable charging regardless of device position, enhancing usability and performance.
Area of Science:
- Electrical Engineering
- Applied Physics
- Biomedical Engineering
Background:
- Wireless charging for compact electronics like smart-watches and capsule endoscopes faces challenges due to limited battery life and recharging needs.
- High-performance applications require stable power transfer irrespective of device positioning and orientation.
Purpose of the Study:
- To propose a compact, planar, omnidirectional wireless power transmitter for small electronic devices.
- To address control challenges in planar coil configurations and ensure stable charging performance.
Main Methods:
- Implementation of a multilayer printed circuit board (PCB) based transmitter.
- Integration of a current source inverter with an LCCL compensation network.
- Development of mathematical modeling and computer simulations for design validation.
Main Results:
- Achieved stable wireless charging across varying positions and orientations.
- Experimental tests showed a mean receiving current fluctuation of only 2.16 mA.
- Demonstrated effective charging in capsule endoscopy with maximum transmission power of 1904.4 mW.
Conclusions:
- The proposed compact wireless power transmitter offers a robust solution for charging small electronic devices.
- The design is competitive with state-of-the-art systems and suitable for demanding applications like medical devices and wearables.
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