NFC Router Trigger Circuit for Automatic Standby Activation
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Solution Overview
Problem
Existing NFC devices face challenges in energy management, particularly in standby mode, where continuous battery power consumption is undesirable, and manual user intervention is required to activate the NFC router, which is impractical.
Innovation Solution
A trigger circuit is introduced within the NFC router, comprising a resistive and capacitive cell linked to the rectifier bridge output, and external switches to automatically activate the power supply when an NFC field is detected, minimizing standby power consumption and enabling automatic exit from standby mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the NFC router is continuously powered by the battery, then the NFC function is always available, but the power consumption increases
Solution Approach 1:
The circuit prepares for NFC activation by continuously monitoring the antenna terminals for the presence of an NFC field. When a field is detected, the circuit automatically activates the power supply to the NFC router, eliminating the need for user intervention and ensuring immediate NFC functionality when needed.
Solution Approach 2:
The system activates itself automatically upon detecting an NFC field. The detection circuit monitors the antenna terminals and triggers the power supply activation without requiring external user action, allowing the NFC router to serve itself by transitioning from standby to active state based on field presence.
2Use of energy by moving object
If the NFC router is placed in standby mode to reduce power consumption, then energy is saved, but manual user intervention is required to activate it
Solution Approach 1:
The system eliminates the need for manual user intervention by implementing automatic activation. The detection circuit continuously monitors the antenna terminals for NFC field presence and automatically triggers the power supply activation when a field is detected, allowing the system to serve itself without external input.
Solution Approach 2:
The system employs feedback through continuous monitoring of the antenna terminals. The detection circuit provides real-time information about NFC field presence to the control logic, which then activates the power supply accordingly. This closed-loop feedback mechanism ensures the NFC router activates automatically when needed while remaining in low-power standby mode otherwise.
3Extent of automation
If a detection circuit is added to automatically activate the NFC router, then automatic activation is achieved, but the device complexity increases
Solution Approach 1:
The detection circuit utilizes the existing antenna structure and its inherent electrical characteristics to detect NFC field presence. By leveraging the antenna's natural resonance and impedance properties, the circuit achieves field detection without requiring separate dedicated detection hardware, thereby minimizing the increase in device complexity while enabling automatic activation.
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
This solution minimizes NFC router power consumption in standby mode while allowing automatic activation upon detection of an NFC field, maintaining compatibility with existing solutions and adding minimal components.
Implementation Method 1
a rectifier bridge for rectifying a signal picked up by an antenna external to the router
Implementation Method 2
a capacitive element connecting the control terminal of the first switch to the second terminal of the router
Data Source
AI summary
An embodiment near-field communication (NFC) router, includes a first switch coupled between a first terminal of the NFC router and a second terminal of the NFC router; and a rectifier bridge having an output terminal coupled to a control terminal of the first switch, the rectifier bridge being configured to rectify a signal detected by an antenna external to the NFC router.