Capacitive Wireless Charging With Adjustable Electrode Coupling
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Solution Overview
Problem
Capacitive wireless charging systems face inefficiencies in power transfer due to fixed coupling characteristics between transmitter and receiver electrode plates, limiting optimization of power transfer efficiency.
Innovation Solution
A capacitive wireless charging system with adjustable coupling characteristics, achieved by rotating transmitter electrode plates around an off-center axis and adjusting semiconductor switch characteristics, such as switching frequency and duty cycle, to optimize power transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If fixed coupling characteristics are used between transmitter and receiver electrode plates, then device structure is simple, but power transfer efficiency cannot be optimized
Solution Approach 1:
The patent applies the Dynamics principle by making the electrode plates movable relative to each other. The transmitter and receiver electrode plates can be positioned at different distances and orientations, allowing the coupling characteristics to be dynamically adjusted. This enables optimization of power transfer efficiency by finding the optimal positioning configuration, while maintaining a relatively simple overall device structure without complex mechanical systems.
2Loss of energy
If electrode plates are made movable to adjust coupling characteristics, then power transfer efficiency is optimized, but device complexity increases
Solution Approach 1:
The patent applies the Segmentation principle by dividing the electrode plate assembly into separate movable components. The transmitter electrode plates and receiver electrode plates can be independently positioned and adjusted. This segmentation allows for flexible coupling characteristic adjustment while keeping each individual component relatively simple, avoiding the need for a single complex positioning mechanism.
3Productivity
If semiconductor switch characteristics are adjusted to optimize power transfer, then charging performance is improved, but control system complexity increases
Solution Approach 1:
The patent applies the Parameter changes principle by adjusting the characteristics of semiconductor switches (such as switching frequency, duty cycle, or other electrical parameters) to optimize power transfer efficiency. This allows for dynamic adaptation to different coupling conditions and loading scenarios, improving charging performance while using conventional control techniques rather than requiring complex novel control systems.
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
The system enhances power transfer efficiency by dynamically adjusting coupling characteristics to reach predetermined thresholds, thereby improving the ratio of output power to input power.
Implementation Method 1
two coupling capacitors formed by two transmitter electrode plates of a source device at least partially overlapping two receiver electrode plates of a user device
Data Source
AI summary
A capacitive wireless charging system having a charging circuit and the operating characteristics of the charging circuit can be adjusted. The charging circuit includes two coupling capacitors formed by two electrode plates at least partially overlapping two other electrode plates, where the coupling characteristics of the coupling capacitors can be adjusted by moving at least one of the electrodes. When the coupling characteristics of the coupling capacitors reach a pre-determined threshold, the operating characteristics of the charging circuit can be adjusted to optimize the power transfer efficiency of the capacitive wireless charging system.