NFC Resonance Tuning During Standby for Reliable Wake-Up
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing near-field communication (NFC) devices face challenges in maintaining resonance frequency adjustment during standby mode, as they rely on power from the detected field for frequency tuning, which can lead to inadequate wake-up power when out of tune, especially in low-consumption modes.
Innovation Solution
A controllable resistive dividing bridge powered by the device's battery is used to adjust the oscillating circuit's frequency during standby periods, utilizing stored data from previous measurements to ensure field detection and wake-up, without requiring a microcontroller or digital-to-analog converter, thus minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the NFC device uses field-detected power for frequency tuning, then the device can operate in low-power standby mode, but the device may have insufficient power for wake-up when out of tune
Solution Approach 1:
The system performs frequency tuning measurements and stores tuning data before entering standby mode. This preliminary action ensures that when the device needs to wake up, it already has the necessary frequency adjustment information, eliminating the need for continuous power-consuming tuning operations during standby while ensuring reliable wake-up capability.
Solution Approach 2:
The invention creates a simplified control model that copies only the essential frequency tuning functionality needed for standby operation. Instead of implementing the full frequency tuning system, a simplified version using a resistive bridge and latch circuit is created that consumes minimal power while maintaining the critical wake-up detection capability.
2Measurement precision
If a microcontroller and digital-to-analog converter are used for frequency tuning, then precise frequency control is achieved, but power consumption increases during standby
Solution Approach 1:
The invention extracts only the essential frequency tuning functionality from the full control system, removing the power-intensive microcontroller and digital-to-analog converter. A simplified resistive bridge circuit with latch is implemented that provides sufficient frequency control precision for standby operation while consuming minimal power.
Solution Approach 2:
The patent replaces expensive, power-consuming integrated circuits (microcontroller and DAC) with a simpler, cheaper resistive bridge circuit and latch implementation. This simplified approach provides adequate frequency tuning precision for the specific standby wake-up detection function without the overhead of complex control electronics.
3Use of energy by moving object
If the oscillating circuit is tuned to non-resonant frequency during standby, then power consumption is reduced, but field detection capability is degraded
Solution Approach 1:
The system performs frequency measurements and determines optimal tuning parameters before entering standby mode. These preliminary measurements allow the device to be pre-configured with the correct frequency adjustment settings, ensuring that when wake-up is needed, the oscillating circuit is already tuned to the resonant frequency for optimal field detection.
Solution Approach 2:
The invention implements a feedback mechanism where frequency measurements are taken, tuning data is stored, and this information is used to control the oscillating circuit during standby. The system continuously monitors and adjusts the frequency based on stored measurements, ensuring the circuit remains optimally tuned for field detection while maintaining low power consumption.
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 allows for continuous frequency tuning and improved field detection during standby periods, ensuring NFC devices can wake up and communicate effectively without increasing power consumption, maintaining compatibility with low-power modes.
Implementation Method 1
the resonance frequency of an oscillating circuit of the device detecting a field is generally adjusted
Implementation Method 2
the resonance frequency of an oscillating circuit of the device detecting a field is generally adjusted due to capacitive elements having a settable value
Implementation Method 3
the circuit comprises a controllable resistive dividing bridge powered by the battery and having an output controlling the controllable capacitor
Implementation Method 4
powered by a battery when the circuit is at standby
Data Source
AI summary
A near-field communication circuit includes an oscillating circuit having a controllable capacitor. A control circuit is coupled to the oscillating circuit to control the controllable capacitor. A battery is coupled to the control circuit to enable control when the near-field communication circuit is in a standby mode. The near-field communication circuit can be utilized by a mobile communication device.