Dynamic Antenna Voltage Limiter Circuit for Transponder Range
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Solution Overview
Problem
Existing transponder systems face limitations in adjusting antenna coil voltage limits, leading to suboptimal performance during data reception and transmission, with a fixed voltage limit compromising recognition and communication range.
Innovation Solution
Implementing a dynamic antenna voltage limiter circuit that adjusts voltage limits based on operation modes, allowing for different voltage limits during data reception and transmission, thereby enhancing communication range and signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed voltage limit is applied to the antenna coil, then component damage from excessive voltage is prevented, but communication range and signal quality deteriorate
Solution Approach 1:
The patent implements a dynamic voltage limiting system that switches between different voltage limits based on operation mode. A mode indicator signal generated by the microcontroller unit (MCU) controls a switchable voltage limiter circuit, allowing the antenna voltage limit to be dynamically adjusted between a first voltage limit (lower) for reception mode and a second voltage limit (higher) for transmission mode, thereby optimizing both component protection and communication range
2Length of moving object
If a higher voltage limit is used for transmission, then communication range improves, but component damage risk increases
Solution Approach 1:
The system employs feedback control through a mode indicator signal that reflects the current operation mode (reception or transmission). This feedback signal controls the switchable voltage limiter to automatically select the appropriate voltage limit, ensuring that the higher voltage limit is only applied during transmission when necessary, and the lower limit is used during reception to protect components
3Reliability
If a lower voltage limit is used for reception, then component protection is optimized, but signal-to-noise ratio deteriorates
Solution Approach 1:
The patent applies different voltage limiting characteristics to different operation modes. During reception mode, a first (lower) voltage limit is applied to protect components from damage. During transmission mode, a second (higher) voltage limit is applied to enable sufficient signal strength for communication. This localized optimization of voltage limiting based on operational context resolves the contradiction between component protection and signal quality
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 approach improves transponder performance by allowing a lower voltage limit for reception and a higher limit for transmission, increasing the communication range and signal quality, while preventing component damage from excessive voltage.
Implementation Method 1
The antenna coil 101 is adapted to receive electromagnetic waves, particularly in the high-frequency domain, emitted by a read/write device. When the antenna coil 101 absorbs electromagnetic radiation, a voltage is generated between a first coil connection 111 and a second coil connection 112.
Implementation Method 2
Four rectifier diodes 102 are provided between the antenna coil 101 and an antenna voltage limiter circuit 104 and are connected to rectify a voltage of the antenna coil 101.
Data Source
AI summary
A transponder with an antenna and an antenna voltage limiting unit for limiting an antenna voltage to a first voltage limit when the transponder is receiving data and to a second voltage limit when the transponder is sending data. Dynamic voltage limitation may be implemented by using a computer program or implemented in hardware. Additionally, it is possible to introduce a third voltage limit when the transponder is in a third mode of operation such as standby or sleeping mode.