Electromagnetic Transponder Power Management via Coupling Factor Evaluation
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Solution Overview
Problem
Electromagnetic transponders face challenges in evaluating the coupling factor with a terminal without causing overheating, as existing methods like detuning can worsen the situation and are not effective when the transponder's power consumption is low and the coupling is near optimum.
Innovation Solution
A method and system for managing power in electromagnetic transponders that involves evaluating the power consumption and coupling factor, adjusting the resistive load by switching resistive elements, and detuning the oscillating circuit to maintain optimal remote supply, allowing for evaluation and adjustment of the coupling factor without data exchange between the transponder and terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the transponder circuits consume less power, then the power consumption decreases, but the voltage and remote-supply power reach a maximum causing overheating
Solution Approach 1:
The patent implements a feedback mechanism where the transponder continuously monitors its own power consumption and the coupling factor with the terminal. When low power consumption is detected (indicating risk of overheating), the system automatically adjusts the load by switching resistors in parallel on the resonant circuit or detunes the oscillating circuit, creating a closed-loop control that prevents temperature rise.
Solution Approach 2:
The patent changes the electrical parameters of the transponder system by dynamically adjusting the load resistance (switching resistors in parallel) and the resonant frequency (detuning the oscillating circuit). These parameter changes allow the system to move away from the critical optimum coupling point where maximum power transfer occurs, thereby preventing overheating while maintaining operational functionality.
2Temperature
If detuning is performed to reduce remote-supply power, then overheating is prevented, but the transferred power may increase worsening the situation
Solution Approach 1:
The patent employs dynamic adjustment strategies where the system continuously evaluates the coupling factor and power consumption, then adaptively selects between two detuning approaches: adjusting load resistance or detuning the oscillating circuit. This dynamic decision-making process ensures that detuning actions reduce transferred power and prevent overheating rather than worsening the situation.
Solution Approach 2:
The patent takes preliminary action by evaluating the coupling factor and power consumption levels before overheating occurs. The system proactively adjusts the load or detunes the circuit when low power consumption is detected, preventing the critical overheating condition from developing in the first place, rather than reacting after the problem arises.
3Loss of time
If the coupling factor is evaluated without data exchange, then communication efficiency is improved, but the evaluation accuracy may be insufficient
Solution Approach 1:
The patent implements a self-service evaluation mechanism where the transponder autonomously determines the coupling factor by monitoring its own power consumption and electrical characteristics. The transponder performs self-diagnosis by evaluating its operating conditions without requiring external communication with the terminal, thereby eliminating communication overhead while maintaining sufficient evaluation accuracy for power management decisions.
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
Enables accurate evaluation and management of the coupling factor, preventing overheating and ensuring stable power supply by adjusting the transponder's load and detuning based on the current coupling position, independent of the terminal type.
Implementation Method 1
Such circuits are intended to be coupled by near magnetic field when the transponder enters the field of the terminal
Implementation Method 2
transponders have no autonomous power supply and extract the power supply necessary to their circuits from the high-frequency field radiated by the antenna of the terminal
Data Source
AI summary
A method for managing the power in an electromagnetic transponder in the field of a terminal, including the steps of: evaluating the power consumption of the transponder circuits; and if this power consumption is below a threshold, evaluating the current coupling factor between the transponder and the terminal and, according to the current coupling: causing an increase of the transponder power consumption or causing a detuning of an oscillating circuit of the transponder.