Self-Optimizing NFC Antenna for Wireless Charging Alignment
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Solution Overview
Problem
Users face frustration in aligning devices with wireless charging transmitters for efficient charging, particularly due to the need for precise NFC alignment, which can lead to poor user experience and inefficient power transfer.
Innovation Solution
A wireless charging system that includes a Near Field Communication (NFC) controller to create a secure channel for authentication and power transfer, providing feedback to users on optimal alignment and dynamically adjusting the transmitter position for improved alignment and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precise NFC alignment is required for authentication, then authentication security is improved, but user operation difficulty increases and charging efficiency decreases
Solution Approach 1:
The transmitter coil is made dynamically adjustable in position rather than fixed. The system can reposition the transmitter coil to different locations to achieve optimal alignment with the device receiver, transforming a static alignment problem into a dynamic adjustment process that maintains authentication security while improving ease of use
Solution Approach 2:
The system incorporates feedback mechanisms that detect alignment status and provide information to adjust transmitter position. This feedback loop enables the system to automatically optimize alignment between NFC components and charging coils, maintaining security requirements while eliminating manual alignment difficulties
Solution Approach 3:
The system performs preliminary position adjustment of the transmitter coil before initiating the charging process. By pre-positioning the transmitter at an optimal location that ensures both NFC authentication and charging coil alignment, the system eliminates the need for users to manually achieve precise alignment
2Reliability
If device must be wakeful for NFC authentication, then authentication reliability is improved, but energy consumption increases
Solution Approach 1:
The transmitter incorporates an NFC controller that acts as an intermediary to initiate and manage the authentication process. This allows the transmitter to actively engage the NFC chip without requiring the device to remain continuously wakeful, as the NFC communication can be triggered by the transmitter's carrier wave
Solution Approach 2:
The system uses periodic carrier waves from the NFC controller to intermittently activate NFC authentication rather than requiring continuous device wakefulness. This periodic activation maintains authentication reliability while significantly reducing the energy consumption associated with keeping the device permanently awake
3Device complexity
If single transmitter position is used, then device complexity is reduced, but charging efficiency decreases
Solution Approach 1:
The transmitter coil position is made dynamically adjustable rather than fixed at a single location. This allows the system to optimize charging efficiency by repositioning the coil to align with the device receiver, while the overall transmitter structure remains relatively simple and the adjustment can be automated
Solution Approach 2:
The transmitter system is segmented into controllable components, particularly the NFC controller and the charging coil, which can be independently positioned and activated. This segmentation allows efficient multi-device charging by directing different coil segments to different devices as needed
4Adaptability or versatility
If NFC and charging coils are separately positioned, then design flexibility is improved, but alignment precision becomes more difficult
Solution Approach 1:
The NFC controller and charging coil functions are merged into a single integrated transmitter unit with a shared controller. This integration ensures that both NFC authentication and charging operations occur from the same physical location, automatically maintaining alignment precision while preserving the design flexibility to position the integrated unit strategically
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
Enhances user experience by simplifying the alignment process, improving charging efficiency, and ensuring secure and efficient power transfer without the need for continuous device wake-up or precise alignment, allowing for concurrent charging of multiple devices.
Implementation Method 1
an NFC controller to create an electromagnetic carrier field
Implementation Method 2
A transmitter may be configured to charge an electronic device... An induction coil within the transmitter may create an alternating electromagnetic field
Data Source
AI summary
A charging system may include a charging apparatus having a controller and a power transmitter. The controller may be configured to determine a device position relative to the controller based on at least one signal received from the device. The controller may also be configured to determine whether the device position is at an optimal position, and provide feedback indicative of the device position.