Transponder Unit Frequency Synchronization via Dynamic Block Adjustment
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Solution Overview
Problem
Conventional actively transmitting transponder units experience errors in data transfer due to frequency differences between the clock signal of the reading device and the frequency generator, leading to deviations in bitrate and potential errors in data bit timing, which are not effectively addressed by existing solutions without increasing production costs.
Innovation Solution
A transponder unit with a receiver for the reading device's clock signal, a frequency generator, and a frequency comparator to determine and adjust the data block size or modify the frequency generator signal to match the reading device's frequency, ensuring accurate data transfer by restricting data block size or adding/removing pulses to align with the expected bitrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If an actively transmitting transponder unit uses its own frequency generator for data transmission, then the transmission range is increased, but frequency differences between the transponder's frequency generator and the reading device's clock signal cause bitrate deviations and data transfer errors
Solution Approach 1:
The transponder unit continuously monitors the frequency difference between its frequency generator and the reading device's clock signal. Based on this feedback, the control unit dynamically adjusts the data block size to compensate for bitrate deviations, ensuring accurate data transfer while maintaining extended transmission range
Solution Approach 2:
The invention changes the data block size parameter dynamically based on the measured frequency difference. When frequency deviation is detected, the system adjusts the data block size to maintain synchronization with the reading device's expected bitrate, resolving the contradiction between extended range and transfer accuracy
2Reliability
If the transponder unit continuously monitors frequency difference and adjusts data block size, then data transfer accuracy is improved, but device complexity increases
Solution Approach 1:
The control unit performs multiple functions: it manages frequency difference monitoring, calculates appropriate data block sizes, and controls data transmission timing. By consolidating these functions in a single control unit rather than adding separate dedicated circuits, the invention improves data transfer accuracy while minimizing the increase in device complexity
3Reliability
If data block size is restricted based on frequency difference, then bitrate synchronization is improved, but data transfer efficiency decreases
Solution Approach 1:
The data block size is not fixed but dynamically adjusted based on the measured frequency difference. When frequency synchronization is good, larger data blocks are used to maintain high transfer efficiency. When frequency deviation is detected, the system reduces data block size to maintain synchronization. This dynamic approach ensures both bitrate synchronization and optimal data transfer efficiency under varying conditions
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 ensures reliable data transfer by preventing significant time differences in bit transmission, avoiding errors and maintaining high data transfer rates without increasing production costs, as the reading device perceives no frequency difference.
Implementation Method 1
The RFID transfer method is a data transfer method by means of electromagnetic fields in a frequency range of e.g. 13.56 MHz or 868 MHz
Implementation Method 2
the transponder unit itself generates a field which simulates to the reading device a modulation of the reading device field
Implementation Method 3
a frequency comparator which is adapted to determine the frequency difference between the clock frequency and the frequency generator frequency
Implementation Method 4
Upon data transfer from the transponder unit to the reading device through modulation of backscatter cross section, the backscatter cross section, which gives information about how strongly an object reflects electromagnetic waves, is modulated
Implementation Method 5
the alternating current which is induced in the transponder coil by an electromagnetic field generated by the reading device
Data Source
AI summary
A transponder unit for transferring data to a reading device by modulation of an electromagnetic field includes a device for varying the data block size of the data by restricting the same or by modifying a clock signal, in dependence on a frequency difference between a clock frequency of a clock signal transferred from the reading device to the transponder unit, and a frequency generator frequency of a frequency generator of the transponder unit.