Design and optimization of resonance-based efficient wireless power delivery systems for biomedical implants

Area of Science:

• Electrical Engineering
• Biomedical Engineering
• Wireless Power Transfer

Background:

• Conventional inductive links use two coils, limiting efficiency and range.
• Resonance-based systems offer potential for efficient long-distance power delivery.
• Four-coil systems can mitigate issues from low coupling coefficients.

Purpose of the Study:

• To analyze four-coil resonance-based wireless power transfer systems.
• To outline the impact of design parameters on power transfer efficiency.
• To present design steps and a proof-of-concept for efficient systems.

Main Methods:

• Analysis of four-coil energy transfer system design parameters.
• Optimization of system design for maximum efficiency at specific distances.
• Implementation and testing of a proof-of-concept prototype.

Main Results:

• Four-coil systems compensate for low coupling using high-quality (Q) factor coils.
• Efficiency profile is less sensitive to distance variations compared to two-coil systems.
• Prototype achieved >80% efficiency at 10-20 mm distance, outperforming ~40% in two-coil systems.

Conclusions:

• Resonance-based four-coil systems provide superior wireless power transfer efficiency and range.
• The proposed analysis and design techniques are validated by the prototype.
• This technology enhances possibilities for implantable devices and other applications.