Frequency Characteristic Measurement for Wireless Power Resonance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless power transmission systems using electric field coupling struggle to individually measure the resonance characteristics of power transmitting and receiving apparatuses, leading to increased variation in power transmission efficiency when designed together.
Innovation Solution
A frequency characteristic measurement method that uses specialized measurement tools to isolate and measure the resonance circuits of both the power transmitting and receiving apparatuses independently, allowing for generic design of each apparatus regardless of the other's configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the power receiving apparatus is placed on the power transmitting apparatus to measure resonance characteristics, then the combined characteristics of both apparatuses can be measured, but only the combined characteristics are obtained and individual apparatus characteristics cannot be measured separately
Solution Approach 1:
The measurement system is segmented into separate measurement functions. The power transmission resonance circuit is measured independently from the power reception resonance circuit by using a measurement tool that connects to the power transmitting apparatus without requiring the power receiving apparatus to be present. This segmentation allows individual apparatus characteristics to be measured separately, enabling independent optimization of each apparatus while maintaining the ability to measure combined characteristics when needed.
2Reliability
If the power receiving apparatus is placed on the power transmitting apparatus during measurement, then practical operational conditions are simulated, but the resonance characteristics of individual apparatuses cannot be independently measured leading to increased variation in power transmission efficiency
Solution Approach 1:
The resonance characteristics of the power transmission resonance circuit are measured in advance using a dedicated measurement tool before the actual power transmission operation. This preliminary measurement allows the resonance frequency and other characteristics to be determined and optimized independently, ensuring reliable power transmission efficiency without the need to place the power receiving apparatus on the power transmitting apparatus during measurement.
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 the design of highly-efficient power transmitting and receiving apparatuses with consistent resonance conditions, improving power transmission efficiency by allowing independent circuit design based on measured frequency characteristics.
Implementation Method 1
a system such as that disclosed in International Publication No. WO 2013/054800, which transmits power from a power transmitting apparatus to a power receiving apparatus by disposing an active electrode of the power transmitting apparatus and an active electrode of the power receiving apparatus so as to face one another, coupling the two electrodes by forming a strong electric field between the electrodes, and using the electric field coupling
Implementation Method 2
it is necessary to set the resonance characteristics of resonance circuits formed in the power transmitting apparatus and the power receiving apparatus, respectively, to desired characteristics in order to increase the efficiency of power transmission
Data Source
AI summary
A power transmission-side measurement tool is installed in a power transmitting apparatus that applies an AC voltage stepped up by a step-up transformer to an active electrode and a passive electrode. The power transmission-side measurement tool includes a measurement active electrode that faces the active electrode and a measurement passive electrode that faces the passive electrode, and the measurement active electrode and measurement passive electrode are shorted together. Frequency characteristics of a serial resonance circuit formed by leakage inductance of the step-up transformer and capacitors are measured in a state where the power transmission-side measurement tool is placed on the power transmitting apparatus.