Wireless Power Receiving Impedance Matching Control
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Solution Overview
Problem
Existing non-contact electrical power transmission systems face efficiency declines due to impedance mismatching caused by changes in distance or environmental factors, and existing solutions require complex impedance variable circuits that increase circuit scale and are ineffective in unforeseen circumstances.
Innovation Solution
An electrical power receiving apparatus with an impedance measurement section for both the antenna and charging apparatuses, and a control section that dynamically switches charging apparatuses to match impedance, ensuring efficient power delivery across various conditions without increasing circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an impedance variable circuit is used to adjust impedance, then electrical power supply efficiency is maintained, but circuit scale increases
Solution Approach 1:
The patent implements a feedback mechanism where the control section continuously monitors the impedance of the resonant system and dynamically adjusts the impedance variable circuit to maintain impedance matching between the A/C power source and the resonant system, thereby maintaining electrical power supply efficiency without requiring oversized circuits
Solution Approach 2:
The patent employs a dynamic impedance adjustment mechanism where the impedance variable circuit can change its characteristics in real-time based on feedback from the impedance measurement, allowing the system to adapt to changing conditions and maintain optimal efficiency without fixed complex circuitry
2Reliability
If impedance adjustment is performed using pre-stored data map or relational expression, then impedance matching is obtained under assumed conditions, but electrical power supply efficiency declines under unforeseen circumstances
Solution Approach 1:
The patent uses real-time feedback from the impedance measurement to dynamically adjust the impedance variable circuit, allowing the system to adapt to unforeseen circumstances such as interceptors changing space magnetic permeability, rather than relying on pre-stored data that cannot account for unexpected conditions
Solution Approach 2:
The control section autonomously monitors impedance changes and adjusts the impedance variable circuit without external intervention, enabling the system to self-adapt to changing environmental conditions and maintain electrical power supply efficiency under various circumstances
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 maintains high electrical power supply efficiency across varying circumstances without increasing circuit scale, by dynamically matching impedance between the antenna and charging apparatuses, thus optimizing power delivery.
Implementation Method 1
a non-contact electrical power transmission system which transmits electrical power from an electrical power transmission apparatus to an electrical power receiving apparatus using electromagnetic resonance
Data Source
AI summary
This electrical power-receiving apparatus makes it possible to suppress a decline in power supply efficiency in a variety of different circumstances while avoiding an increase in circuit scale. This apparatus comprises an impedance control unit (307) for sequentially switching through any one of a plurality of charging devices in a charging device group (310), as candidate charging devices for a supply destination to which electrical power is to be supplied. The impedance control unit (307) also selects from the candidates a charging device to which electrical power is actually supplied, on the basis of the difference between the impedance of the charging device group (310) for each candidate and the impedance of an electrical power receiving antenna unit (301), and causes electrical power to be supplied to the selected charging device.