Multi-Coil Magnetic Field Generation for Electronic Contact Lens Power
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Solution Overview
Problem
Electronic contact lenses face power supply challenges due to varying orientations relative to the magnetic field, leading to inconsistent power coupling and reduced energy transfer, as the strength of inductive coupling between the contact lens and the power source changes with the lens's position.
Innovation Solution
Incorporating multiple conductive coils to produce a rotating magnetic field, which maintains consistent power transfer by adjusting the magnetic field direction based on feedback from sensors, ensuring continuous power delivery regardless of the contact lens's orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single magnetic field source is used for wireless power transmission to the contact lens, then the system structure is simple, but the power coupling becomes inconsistent when the lens orientation varies
Solution Approach 1:
The magnetic field generation system is segmented into multiple independent coils (first conductive coil and second conductive coil) with different orientations. Each coil generates a magnetic field component that contributes to the overall power transfer, ensuring that at least one coil maintains effective coupling regardless of lens orientation.
Solution Approach 2:
The system dynamically adjusts the magnetic field generation by selectively activating different coils based on detected lens orientation. The controller modifies which coils are active and adjusts their drive parameters in real-time to maintain optimal power coupling as the lens orientation changes.
2Productivity
If the magnetic field direction is fixed, then the system control is simple, but the power transfer efficiency decreases when the contact lens orientation changes
Solution Approach 1:
The system incorporates sensors that detect the contact lens orientation and provide feedback to the controller. Based on this feedback, the controller adjusts which coils are activated and modifies their drive parameters to maintain optimal magnetic field alignment with the lens, thereby preserving power transfer efficiency across varying orientations.
Solution Approach 2:
The magnetic field generation is made dynamic by selectively activating different coils and adjusting their drive parameters in response to lens orientation changes. This dynamic adaptation ensures that the magnetic field configuration optimally couples with the lens regardless of its orientation, maintaining high power transfer efficiency.
3Reliability
If multiple conductive coils are used to produce rotating magnetic field, then the power supply stability is improved, but the device complexity increases
Solution Approach 1:
The power supply system is segmented into multiple coil units with different orientations, each capable of independent activation. This segmentation allows the system to maintain stable power delivery by selecting appropriate coil combinations based on lens orientation, reducing the impact of orientation variations on power supply stability.
Solution Approach 2:
The system dynamically selects and activates different coil combinations based on real-time lens orientation detection. This dynamic adaptation ensures that the magnetic field generation remains effective across varying orientations, maintaining power supply stability without requiring all coils to operate simultaneously at full power.
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 rotating magnetic field ensures a stable and increased power supply to the contact lens, maintaining operational efficiency across varying orientations and movements, enhancing the reliability of wireless power transmission.
Implementation Method 1
An energy source, for instance a source coil worn as a necklace, can produce a time-varying magnetic field ('TVMF'). An electronic contact lens including a reciprocal coil can inductively couple to the energy source by converting current in the reciprocal coil caused by the TVMF into power.
Implementation Method 2
the direction of the TVMF can be rotated, for instance by driving two or more of the conductive coils with currents at a same frequency but with a phase difference between the currents
Data Source
AI summary
An augmented reality system includes an electronic contact lens and a plurality of conductive coils to be worn, for instance, around a neck, around an arm, or on a chest of a user. The conductive coils can inductively couple to the electronic contact lens by producing magnetic fields that the electronic contact lens can convert into power. A direction of the resulting magnetic at the electronic contact lens can rotate over time, enabling the electronic contact lens to periodically form a strong inductive coupling with the plurality of conductive coils despite the orientation of the electronic contact lens. The electronic contact lens can also output a feedback signal representative of the power produced at the electronic contact lens or an orientation signal representative of the orientation of the eye, and the magnetic fields produced by the conductive coils can be altered based on the feedback signal or orientation signal.