RFID Tag Switch Circuit for Stable Power During Impedance Modulation
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Solution Overview
Problem
Existing RFID tags face issues with power supply voltage instability during response signal transmission, leading to interrupted operation and inefficient power utilization from received radio waves due to separation of power and communication systems and excessive power withdrawal during signal transmission.
Innovation Solution
A wireless communication device with a switch circuit that includes a wiring and a switch element, allowing the impedance of the antenna to be varied, ensuring stable power supply voltage to the internal circuit even during response signal transmission by using a rectifying circuit and a switch circuit that operates based on internal circuit output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the switch unit is used to vary antenna impedance for communication, then communication function is improved, but power supply voltage stability deteriorates due to separation of power and communication systems
Solution Approach 1:
The patent merges the power supply system and communication system into a unified structure where the switch element serves dual purposes: it modulates antenna impedance for communication while simultaneously regulating power supply voltage to the internal circuit, eliminating the harmful separation of these systems
Solution Approach 2:
The switch element is designed to perform multiple functions: it acts as both a communication modulation device (varying antenna impedance) and a power supply regulation device (controlling voltage to internal circuit), thereby achieving universal functionality that resolves the contradiction between communication adaptability and power stability
2Adaptability or versatility
If the switch is turned on for response signal transmission, then communication capability is improved, but power utilization efficiency deteriorates due to excessive power withdrawal
Solution Approach 1:
The switch element operates based on feedback from the internal circuit's power supply voltage status, enabling it to modulate antenna impedance for communication while simultaneously regulating power distribution to prevent excessive power withdrawal and maintain efficient power utilization from the rectified voltage
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
The solution ensures stable power supply voltage to the internal circuit of the RFID tag during response signal transmission, enhancing operational stability and efficient power utilization from received radio waves.
Implementation Method 1
a rectifying circuit that is connected to the antenna and rectifies the radio wave received by the antenna to generate voltage
Implementation Method 2
the operation of the switch element varies the impedance of the antenna
Data Source
AI summary
A wireless communication device includes: an antenna for transmitting and receiving a radio wave, a rectifying circuit that is connected to the antenna and rectifies the radio wave received by the antenna to generate voltage, an internal circuit that operates by the voltage generated by the rectifying circuit, and a switch circuit that is disposed contactlessly with respect to the antenna and operates on the basis of an output signal of the internal circuit, wherein the switch circuit includes a coupling wiring and a switch element, and the operation of the switch element varies the impedance of the antenna so that communication can be carried out.