Capacitive Power Transfer Stabilizing Reference Potentials
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Solution Overview
Problem
Power transfer systems with capacitive coupling face instability in reference potentials when a power reception device is placed on a power transmission device, leading to potential malfunctions due to cross capacitance effects, which are not adequately addressed by existing solutions.
Innovation Solution
The system includes specific electrode configurations and insulating layer designs that satisfy certain capacitance formulas to stabilize reference potentials, ensuring that the reference potential of the power reception device approaches that of the power transmission device, thereby preventing instability issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the power reception device is placed on the power transmission device to enable power transfer through capacitive coupling, then power transfer efficiency is improved, but reference potential stability deteriorates due to cross capacitance effects
Solution Approach 1:
The patent introduces a reference potential electrode as an intermediary element between the power transmission device and power reception device. This electrode is positioned between the active electrodes and connected to the reference potential of the power transmission device, serving as a mediator to stabilize the reference potential of the power reception device without interfering with the power transfer function between the active electrodes.
Solution Approach 2:
The patent creates an equipotential connection by connecting the reference potential electrode to the reference potential of the power transmission device. This ensures that the reference potential of the power reception device is stabilized at the same potential level as the power transmission device, eliminating potential differences that would cause instability and malfunction.
2Productivity
If cross capacitance is allowed to form between active electrodes during power transfer, then power transfer function is enabled, but reference potential variation increases causing malfunction
Solution Approach 1:
The reference potential electrode acts as an intermediary that isolates the harmful reference potential variation caused by cross capacitance from the power reception device. It provides a stable reference potential connection to the power transmission device while allowing the cross capacitance to exist between the active electrodes for power transfer.
Solution Approach 2:
The patent extracts the reference potential stabilization function from the active electrode system and assigns it to a dedicated reference potential electrode. This separation allows the active electrodes to focus on power transfer through capacitive coupling while the reference potential electrode handles the stabilization of reference potential independently.
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 configuration effectively stabilizes the reference potentials of both devices, preventing malfunctions caused by unstable reference potentials and allowing for efficient power transfer through capacitive coupling.
Implementation Method 1
electric power is transferred from a power transmission device to a power reception device through capacitive coupling (electrical coupling)
Implementation Method 2
electric power is transferred from a power transmission device to a power reception device through capacitive coupling (electrical coupling)
Implementation Method 3
the electrodes are electrically coupled to each other. Accordingly, electric power transfer between the power transmission device and the power reception device is enabled with high transfer efficiency
Data Source
AI summary
A power transfer system that transfers electric power from a power transmission device to a power reception device through electrical coupling. The power transmission device and the power reception device structurally designed such that the power transfer system is able to stabilize reference potentials of the power transmission device and the power reception device when the power reception device is placed on the power transmission device.