Wireless Power Reception Control for NFC Tag-Safe Charging
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Solution Overview
Problem
Existing wireless power transmission systems do not adequately address the protection of Near Field Communication (NFC) tags during charging, as they may be damaged by high-output power transmission.
Innovation Solution
A power reception device equipped with NFC detection capabilities, negotiation, and power information transmission units to manage power transmission based on NFC tag detection, ensuring appropriate power levels are used to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-output power transmission is performed during wireless charging, then charging efficiency is improved, but NFC tags may be damaged due to excessive power levels
Solution Approach 1:
The power reception device performs NFC tag detection before initiating power transmission. By detecting the presence of NFC tags in advance and notifying the power transmission device, the system can prevent damage to NFC tags by avoiding high-output power transmission when NFC tags are present, while still enabling efficient charging when no NFC tags are detected
Solution Approach 2:
The system implements a feedback mechanism where the power reception device continuously monitors for NFC tags during charging and communicates detection results to the power transmission device. This feedback loop allows the power transmission device to adjust its output power dynamically - maintaining high output when safe and reducing output when NFC tags are detected, thus resolving the contradiction between charging efficiency and NFC tag protection
2Object-affected harmful factors
If power transmission is limited to protect NFC tags, then NFC tag safety is improved, but charging speed decreases
Solution Approach 1:
The system dynamically adjusts power transmission levels based on real-time NFC tag detection status. Instead of maintaining a fixed low power level, the power transmission device operates at high power when no NFC tags are present (maintaining charging speed) and automatically reduces power when NFC tags are detected (protecting NFC tags). This dynamic adaptation resolves the contradiction by making the power level conditional rather than static
3Adaptability or versatility
If NFC tag detection function is added to power reception device, then NFC tag protection capability is improved, but device complexity increases
Solution Approach 1:
The power reception device utilizes its existing NFC communication hardware for dual purposes: both for standard NFC operations and for detecting NFC tags during power transmission. By making the NFC detection function universal and integrating it into the existing communication infrastructure, the system gains NFC tag protection capability without proportionally increasing device complexity
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 safe and efficient wireless power transmission by adjusting power levels to protect NFC tags, allowing continued operation without damage or heat generation.
Implementation Method 1
NFC is an abbreviation of Near Field Communication. In the NFC standard, transmission of a message for detecting a communication partner instrument by transmitting carrier waves and applying modulation to the carrier waves is referred to as polling.
Implementation Method 2
The present disclosure relates to a technology of wireless power transmission.
Data Source
AI summary
A power reception device comprising a detection unit configured to perform detection of a Near Field Communication (NFC) tag, a negotiation unit configured to negotiate with a power transmission device, a determination unit configured to determine power information representing power requested to the power transmission device in the negotiation on the basis of predetermined information acquired from the NFC tag and a transmission unit configured to transmit the power information.