Battery-Free Proximity Device for NFC Positioning Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing NFC devices require precise positioning relative to contactless readers due to varying antenna locations across different phone models, necessitating costly and complex modifications to the readers to guide users effectively.
Innovation Solution
A battery-less proximity communication device that harvests energy from an electromagnetic field, assesses power levels, and provides user feedback through a physical or indirect interface to ensure correct positioning without modifying the contactless reader.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contactless readers are modified with antenna positioning characteristics to guide users, then positioning accuracy is improved, but device complexity and implementation cost increase
Solution Approach 1:
Instead of modifying the contactless reader to guide the NFC device positioning, the invention inverts the approach by enabling the NFC device itself to detect power levels and determine its own positioning status. The NFC device autonomously assesses whether it is correctly positioned by monitoring the power harvested from the electromagnetic field, eliminating the need for reader modifications.
Solution Approach 2:
The NFC device performs self-positioning verification by independently detecting the power level received from the contactless reader. The device uses its own detector unit to assess whether the harvested power meets the threshold required for successful communication, allowing it to self-determine correct positioning without external guidance systems.
2Ease of operation
If contactless readers are customized with positioning guidance features, then user positioning guidance is improved, but manufacturing cost increases
Solution Approach 1:
The NFC device autonomously determines its positioning status by detecting the power level harvested from the electromagnetic field. The device compares the detected power against a threshold value and independently concludes whether it is correctly positioned, eliminating the need for expensive reader customization and providing positioning guidance without additional manufacturing costs.
Solution Approach 2:
The invention uses power level detection as a parameter to indicate positioning status. By monitoring changes in the power harvested from the electromagnetic field, the NFC device can determine correct positioning based on whether the power level meets the required threshold, providing operational guidance through parameter variation rather than hardware modification.
3Adaptability or versatility
If multiple transactions with different power requirements are supported, then device versatility is improved, but power detection complexity increases
Solution Approach 1:
The detector unit is designed with universal functionality to handle multiple transaction types with different power requirements. It can detect and compare power levels against multiple thresholds corresponding to different transaction needs, making the device versatile without requiring separate detection mechanisms for each transaction type.
Solution Approach 2:
The device manages different transaction requirements by comparing the detected power level against multiple predefined thresholds. Each threshold corresponds to the minimum power needed for a specific transaction type, allowing the device to adapt to various transactions through parameter comparison rather than complex detection logic.
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
Enables users to position NFC devices correctly without reader modifications, enhancing user independence and reducing implementation costs.
Implementation Method 1
a detector unit which is configured to assess a power level of energy harvested by the contactless interface from the electromagnetic field generated by the contactless reader
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention is a proximity device (10) devoid of electrical battery and comprising a contactless interface (12) able to communicate through a contactless channel with a contactless reader to conduct a transaction. The device requires a first level (15) of power supply to conduct said transaction. The device comprises a detector unit (16) that assesses a power level of energy harvested by the contactless interface from an electromagnetic field generated by the contactless reader. The device comprises an information unit (17) configured that provides feedback (63) to a user (50) of the device. Once the device is informed that the transaction needs to be conducted, the detector unit (16) triggers the information unit (17) to issue said feedback as long as the power level reaches the first level (15) of power supply.