Implantable Receiving Antenna with Segmented Coils
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Solution Overview
Problem
Existing implantable electronic devices face challenges with miniaturization, energy efficiency, and biocompatibility due to limitations in magnetic coupling, component saturation, and the need for high-voltage power supplies, which compromise portability and safety.
Innovation Solution
A receiving antenna system comprising a secondary coil, a tertiary coil, and a capacitor, with the tertiary coil connected to a load, and encapsulated in a low-liquid permeability, non-conductive material, allowing for efficient energy transfer and flexible design options to avoid component saturation and improve coupling, while using hermetic encapsulation to manage non-biocompatible components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the receiving coil is assembled around ferromagnetic material to improve magnetic coupling, then the coupling efficiency is improved, but the ferrite may be brought to magnetic saturation causing losses and temperature rise
Solution Approach 1:
The receiving antenna is divided into two separate coils: a primary receiving coil and a tertiary coil. The primary coil couples with the transmitting antenna, while the tertiary coil is dedicated to powering the load. This segmentation allows independent optimization of each coil's function and prevents magnetic saturation in the ferrite material by distributing the magnetic flux requirements across two separate coupling paths.
Solution Approach 2:
A capacitor is introduced as an intermediary component connected to the primary receiving coil to compensate for its self-inductance. This creates a resonant circuit that enhances the coupling between the transmitting antenna and the primary coil, improving energy transfer efficiency without requiring excessive magnetic flux that would saturate the ferrite material.
2Volume of moving object
If the operation frequency is increased to improve magnetic coupling and reduce component dimensions, then the coupling is improved and dimensions are reduced, but high-voltage and high-current power supply is required which increases volume
Solution Approach 1:
The system operates at a resonant frequency determined by the capacitance value and the inductance of the primary receiving coil. By adjusting the capacitance parameter, the operating frequency is optimized to achieve strong magnetic coupling with the transmitting antenna while maintaining manageable voltage and current levels in the power supply circuit.
3Volume of moving object
If series-capacitors are used to compensate self-inductance and reduce power supply voltage, then the converter volume is reduced, but the winding dimensions must be changed which affects coupling and capacitor specifications
Solution Approach 1:
The receiving antenna is divided into two separate coils: a primary receiving coil and a tertiary coil. The primary coil couples with the transmitting antenna, while the tertiary coil is dedicated to powering the load. This segmentation allows independent optimization of each coil's function and prevents magnetic saturation in the ferrite material by distributing the magnetic flux requirements across two separate coupling paths.
Solution Approach 2:
A capacitor is introduced as an intermediary component connected to the primary receiving coil to compensate for its self-inductance. This creates a resonant circuit that enhances the coupling between the transmitting antenna and the primary coil, improving energy transfer efficiency without requiring excessive magnetic flux that would saturate the ferrite material.
4Loss of energy
If the receiving antenna is implanted subcutaneously to achieve short transfer distance and good coupling, then the coupling efficiency is improved, but the implantation is difficult, time consuming and increases complications
Solution Approach 1:
The ferrite material is extracted from the implantable receiving antenna design and placed only in the external transmitting antenna. This eliminates the need for complex surgical implantation procedures while maintaining efficient power transfer through the optimized external transmitter configuration. The receiving antenna becomes a simple coil assembly that can be implanted with minimal surgical intervention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances energy transfer efficiency, reduces device volume, and ensures biocompatibility by optimizing magnetic coupling and power supply requirements, making the system suitable for implantable devices and challenging environments.
Implementation Method 1
The receiving antenna may be inductively connected to an external transmitting antenna
Implementation Method 2
A more effective approach towards miniaturization is to compensate the self-inductance of the windings by series-capacitors. Due to series resonance, the voltage of the windings terminals is high, but the necessary power supply voltage is quite low
Data Source
AI summary
The present invention is about a device with a receiving antenna (110), wherein the receiving antenna (110) comprises a secondary coil (112), and being arranged for inductively connecting to a transmitting antenna (200) comprising a primary coil (202). The device of the invention is characterized in that the receiving antenna (110) further comprises a tertiary coil (114) arranged to have connection to a load in the device; and a capacitor (142) to which the secondary coil (112) is connected; and there is an encapsulation (120) comprising a low liquid permeability and non-conductive material encapsulating at least a part of the receiving antenna (110). Additionally, the present invention is about a power transfer system.