RFID Tag Writing System Dynamic Power Control
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Solution Overview
Problem
Conventional RFID tag writing systems face challenges in automatic calibration, including inefficient electromagnetic wave power management and AGC dynamic range, leading to incorrect data writing and failure to distinguish defective tags, which prolongs the calibration process and can result in errors during data issuance.
Innovation Solution
An RFID tag writing system with a conveying unit, antenna, and controller that determines the intensity of the write signal based on return signals from RFID tags, using AGC parameters to adjust signal intensity and prevent interference, ensuring optimal writing positions and power levels for accurate data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electromagnetic wave output from an RFID reader-writer is too powerful, then data writing capability is improved, but the electromagnetic wave flows through RFID tags in other labels causing interference and incorrect data writing
Solution Approach 1:
The patent implements dynamic adjustment of electromagnetic wave transmission power based on real-time detection of RFID tag response signals. The system automatically modulates the power level to match the actual communication needs, preventing both excessive power that causes interference and insufficient power that fails to write data correctly
Solution Approach 2:
The system employs feedback mechanisms by monitoring the response signals from RFID tags and using this information to adjust the transmission power. The controller continuously adapts the electromagnetic wave output based on the received signal strength indicator (RSSI) and other feedback parameters, ensuring optimal power levels are maintained
2Object-generated harmful factors
If the electromagnetic wave output from an RFID reader-writer is too weak, then interference with other RFID tags is reduced, but optimal writing position cannot be found and calibration takes a long time
Solution Approach 1:
The system performs preliminary detection actions by sending low-power inquiry signals before actual data writing. This preliminary action allows the system to quickly assess tag presence and communication quality without causing interference, enabling faster calibration by pre-identifying suitable writing positions and power levels
Solution Approach 2:
The system dynamically adjusts transmission power during the calibration process, starting with lower powers for detection and increasing to optimal levels for writing. This dynamic approach enables the system to quickly identify writing positions while minimizing interference, reducing overall calibration time
3Manufacturing precision
If an AGC function is employed to write data to RFID tags, then data writing capability is improved, but defective RFID tags with low receiving levels cannot be distinguished from normal tags
Solution Approach 1:
The patent introduces an intermediary evaluation mechanism that assesses multiple parameters including signal strength, writing success status, and response quality. This intermediary assessment layer distinguishes defective tags by evaluating whether the tag properly received and processed the write command, rather than relying solely on AGC signal level adjustments
Solution Approach 2:
The system replaces the purely signal-level-based AGC mechanism with a comprehensive verification process that checks actual data writing success. By substituting the mechanical signal adjustment approach with a functional verification approach, the system can identify defective tags that fail to properly execute write operations regardless of their receiving signal levels
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 enables faster and more accurate calibration, preventing errors in data writing and distinguishing between functional and defective RFID tags, thereby improving the efficiency and reliability of the RFID tag writing process.
Implementation Method 1
an antenna configured to transmit a first write signal towards the RFID tags and receive return signals generated by the RFID tags in response to the first write signal
Data Source
AI summary
According to one embodiment, a RFID tag writing system has a conveying unit configured to convey a plurality of RFID tags, an antenna configured to transmit a first write signal towards the RFID tags and receive return signals generated by the RFID tags in response to the first write signal, and a controller configured to determine an intensity of a second write signal to be transmitted by the antenna based on intensities of the return signals.