Dynamic Impedance Matching for Wireless Power Transfer
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Solution Overview
Problem
Power transmission to a human body through a transmitting and receiving electrode system results in reflection loss due to impedance differences between the human body and the system, which affects transmission efficiency.
Innovation Solution
A system comprising a voltage/current detection unit, a controller, and a variable element unit that adjusts the impedance of a power source by calculating and applying a control signal based on real-time voltage and current peak value time differences, using a configured table to optimize impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If power is transmitted to a human body through a transmitting and receiving electrode system, then power transmission is achieved, but reflection loss occurs due to impedance difference between the human body and the system
Solution Approach 1:
The patent implements dynamic impedance adjustment by continuously monitoring voltage and current phase difference and modifying the impedance of the power source in real-time. The controller dynamically changes the impedance parameters based on detected phase differences, transforming the static impedance system into a dynamic one that adapts to varying human body impedance conditions, thereby minimizing reflection loss.
Solution Approach 2:
The patent changes the impedance parameters of the power source based on detected phase difference between voltage and current. By adjusting impedance parameters (resistance and reactance components) according to the phase difference measurements, the system optimizes power transmission efficiency and reduces reflection loss caused by impedance mismatch with the human body.
Solution Approach 3:
The patent employs a feedback mechanism where the controller continuously detects voltage and current signals, calculates phase difference, and uses this information to adjust the impedance of the power source. This closed-loop feedback system ensures that impedance matching is maintained optimally despite changes in human body impedance, thereby minimizing reflection loss.
2Productivity
If impedance of the power source is adjusted to match human body impedance, then power transmission efficiency is enhanced, but system complexity increases due to real-time detection and control mechanisms
Solution Approach 1:
The controller performs multiple functions including voltage detection, current detection, phase difference calculation, and impedance adjustment within a single integrated device. This multi-functionality reduces the need for separate components for each function, thereby managing system complexity while achieving improved power transmission efficiency through real-time impedance matching.
Solution Approach 2:
The system automatically detects phase difference and adjusts its own impedance without requiring external intervention. The controller self-regulates the power source impedance based on real-time measurements, enabling the system to serve itself in maintaining optimal impedance matching, thus improving efficiency without proportionally increasing operational complexity.
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
Minimizes reflection loss and enhances power transmission efficiency by dynamically adjusting the impedance of the power source to match the changing impedance of the human body in real-time.
Implementation Method 1
a voltage/current detection unit measuring a voltage and a current in real time while power is being transmitted between first and second electrodes
Implementation Method 2
a variable element unit converting a variable element under the control of the controller to adjust an impedance of a power source
Data Source
AI summary
A transmitting and receiving electrode system, and power transmission method using the same are provided. The transmitting and receiving electrode system includes: a voltage/current detection unit measuring a voltage and a current in real time while power is being transmitted between first and second electrodes; a controller calculating a variable element value based on the voltage and current values transferred from the voltage/current detection unit; and a variable element unit converting a variable element under the control of the controller to adjust an impedance of a power source.