Wireless Power Control Using NFC Tag Detection and Negotiation
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Solution Overview
Problem
Existing wireless power transmission systems do not adequately handle the detection of NFC tags, which can be damaged by high-output-power transmission, necessitating appropriate processes beyond mere power transmission cessation.
Innovation Solution
A power transmission device equipped with NFC detection, negotiation, and determination means to manage power transmission based on NFC tag information, allowing for appropriate processes when an NFC tag is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If wireless power transmission is performed using magnetic induction according to WPC standard, then power transmission efficiency is improved, but NFC tag antenna elements may be damaged due to high-output-power transmission
Solution Approach 1:
The system performs NFC tag detection before initiating high-power wireless transmission. By detecting the presence of NFC tags in advance and determining their power tolerance levels, the system can prevent damage by adjusting transmission parameters or avoiding transmission to devices with low-power-tolerance NFC tags
Solution Approach 2:
The system establishes bidirectional communication with NFC tags to receive feedback information about power tolerance and device identity. This feedback mechanism allows the transmission device to adapt its output power dynamically, ensuring safe operation while maintaining efficient power transfer when appropriate
2Object-affected harmful factors
If NFC tag detection process is performed in parallel with power transmission processes, then NFC tag safety is improved, but system complexity increases due to multiple concurrent processes
Solution Approach 1:
The system combines NFC tag detection and power transmission control into an integrated decision-making process. The NFC detection results directly inform power transmission parameters, merging what could be separate complex processes into a unified control flow that manages both functions efficiently
Solution Approach 2:
The communication interface serves multiple functions: it detects NFC tag presence, retrieves device identity information, determines power tolerance levels, and controls transmission parameters. This multi-functional approach reduces overall system complexity by using a single communication mechanism for multiple purposes
3Object-affected harmful factors
If power transmission is stopped when NFC tag is detected, then NFC tag damage is prevented, but productivity decreases due to transmission cessation
Solution Approach 1:
The system dynamically adjusts power transmission based on real-time NFC tag detection results. Instead of a static stop/continue decision, the transmission power is continuously adapted according to the detected NFC tag's power tolerance level, device identity, and communication feedback, enabling flexible optimization of both safety and productivity
Solution Approach 2:
The system changes transmission parameters (power level, frequency, duration) based on NFC tag characteristics. By modifying these parameters rather than simply stopping transmission, the system can maintain productive power transfer while keeping NFC tag exposure within safe limits determined by the tag's power tolerance
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 appropriate handling of NFC tags during wireless power transmission, preventing damage and ensuring safe operation.
Implementation Method 1
power transmission/reception and control communication therefor are conducted using magnetic induction
Implementation Method 2
An NFC tag does not have a battery and is driven using the energy of electromagnetic waves transmitted by a communication counterpart during communication
Data Source
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AI summary
A power transmission device (102) performs detection of an NFC tag (103), negotiates with a power reception device (101), and determines power information representing power that is negotiable in the negotiation with the power reception device (101) on the basis of predetermined information acquired from the NFC tag (103). The predetermined information acquired from the NFC tag (103), for example, includes information indicating whether or not the detected NFC tag (103) is a power transmission-allowed NFC tag.