Optimal wireless receiver structure for omnidirectional inductive power transmission to biomedical implants.

Area of Science:

• Biomedical Engineering
• Electrical Engineering
• Wireless Power Transfer

Background:

• Achieving omnidirectional inductive power transmission for biomedical implants requires advanced receiver (Rx) designs.
• Previous approaches often used multiple power management systems for each Rx coil, increasing complexity.

Purpose of the Study:

• To determine the optimal receiver (Rx) structure and power management for maximizing power delivered to the load (PDL).
• To enhance inductive power transmission for biomedical implants under varying coil orientations.

Main Methods:

• Investigated different resonant Rx structures connecting three orthogonal coils to a single power management system.
• Simulated series connection of three coils (3mm, 3.3mm, 3.6mm diameters) with a single capacitor at 100 MHz.

Main Results:

• The optimal Rx structure achieved maximum PDL for large loads, particularly when the implant was tilted at 45 degrees.
• This configuration demonstrated superior PDL in worst-case scenarios compared to previous methods.

Conclusions:

• A single power management system with a series-connected, three-orthogonal-coil resonant structure is highly effective for omnidirectional inductive power transmission.
• This optimized design improves power delivery reliability and reduces system complexity for biomedical implants.