NFC Module Power Management via Proximity Sensor Control
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Solution Overview
Problem
Existing NFC devices consume excessive power and generate Electro-Magnetic Interference (EMI) due to the continuous active mode of the NFC module, display unit, and touch panel, which affects their performance during NFC operations.
Innovation Solution
A method and device where a proximity sensor detects the proximity of an external NFC terminal, triggering the control unit to enable the NFC module and disable the display unit when close, and vice versa, to reduce power consumption and EMI interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the NFC module is kept in active mode continuously, then the NFC device can respond quickly to NFC terminals, but the power consumption increases significantly
Solution Approach 1:
The NFC module dynamically switches between active and sleep modes based on proximity detection. When a NFC terminal is detected within range, the module activates to ensure quick response. When no terminal is present, the module enters sleep mode to reduce power consumption, thus adapting its operational state to real-time needs.
Solution Approach 2:
The system employs periodic proximity detection to determine when to activate the NFC module. Instead of continuous operation, the module is activated periodically only when needed, based on the presence of nearby NFC terminals, reducing overall power consumption while maintaining responsiveness.
2Ease of operation
If the display unit and touch panel are kept active during NFC operations, then the user interface remains responsive, but Electro-Magnetic Interference affects NFC module performance
Solution Approach 1:
The display unit and touch panel dynamically adjust their operational state based on proximity detection. When a NFC terminal is detected, these components are controlled to reduce EMI generation. When no terminal is present, they operate normally to maintain user interface responsiveness, thus adapting to real-time conditions.
Solution Approach 2:
The system periodically checks for NFC terminal presence and adjusts the operational state of the display unit and touch panel accordingly. During NFC operations, these components are controlled to minimize EMI. Between operations, they function normally, creating a periodic pattern of EMI reduction that aligns with NFC activity.
3Productivity
If the NFC module operates continuously, then NFC transactions can be processed without delay, but the overall device efficiency decreases
Solution Approach 1:
The NFC module operates dynamically, switching between active and sleep states based on real-time proximity detection. This ensures that the module is ready to process NFC transactions immediately when a terminal is present, while avoiding unnecessary operation when no terminal is nearby, thus improving overall device efficiency.
Solution Approach 2:
The system uses periodic proximity detection to trigger NFC module activation only when needed. This periodic check-and-activate approach ensures that NFC transactions can be processed without delay when terminals are present, while minimizing energy waste during periods of inactivity.
Data Source
AI summary
An NFC device and an applied method for power saving is provided. The NFC device includes a display unit, an NFC module, a proximity sensor and a control unit. In an initial state, the NFC module is on an idle mode, and the display unit is on an active mode. The proximity sensor is arranged adjacent to the NFC module, and detects whether an external NFC terminal comes close to the NFC device. If the proximity sensor determines that the external NFC terminal comes close to the NFC device, and the proximity sensor generates and sends a first interrupt signal to the control unit. The control unit enables the NFC module and disables the display unit, in response to the first interrupt signal, resulting in reduced power consumption of the display unit and reduced EMI interference generated between the display unit and the NFC module.