Wireless Charging Coupling Control for Variable Coil Distance
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Solution Overview
Problem
Existing wireless charging devices face challenges in maintaining optimal power transmission due to varying distances between charging coils, leading to inefficient or incomplete charging when the distance exceeds a certain threshold.
Innovation Solution
The charging device incorporates a controller that adjusts the wireless charging scheme between electromagnetic induction and magnetic field resonance based on the distance between the charging coils, using a coupling coefficient to determine the appropriate charging method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If inductive coupling is used for wireless charging, then charging efficiency is high when coils are close, but power transmission becomes insufficient when distance exceeds threshold
Solution Approach 1:
The system dynamically switches between inductive coupling mode and resonant coupling mode based on the detected distance between coils. When distance is within threshold, inductive coupling is used for high efficiency; when distance exceeds threshold, resonant coupling is activated to maintain reliable power transmission across varying distances.
Solution Approach 2:
The system changes the coupling parameter from inductive to resonant based on distance conditions. This parameter change allows the system to adapt to different distance scenarios, maintaining both high efficiency at close range and reliable transmission at extended ranges.
2Device complexity
If a fixed charging mode is used, then the system is simple to control, but it cannot adapt to varying distances between coils
Solution Approach 1:
The control system dynamically adjusts the charging mode based on real-time distance detection. The hardware processor monitors coil distance and automatically switches between inductive and resonant coupling modes, providing adaptability without requiring complex manual intervention.
Solution Approach 2:
The system incorporates feedback through distance detection between coils. The hardware processor uses this feedback information to determine the appropriate charging mode, creating a closed-loop control system that adapts to varying distances while maintaining manageable 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
This approach ensures efficient and consistent wireless charging across a wide range of distances, optimizing power transmission by switching between induction and resonance modes as needed.
Implementation Method 1
the charging device transmits electric power from a coil in the housing to a coil in the object to be charged in a form of electromagnetic energy
Implementation Method 2
The hardware processor is configured to generate resonant coupling between the first coil and the second coil when the distance indicated by the parameter exceeds the distance threshold
Data Source
AI summary
A charging device is disclosed. A housing of the charging device has a placement surface on which an object to be charged is allowed to be placed. The object to be charged includes a first coil. The charging device includes a second coil and a controller. The second coil is housed in the housing at a position corresponding to the first coil. The controller acquires a parameter indicating a distance between the first coil and the second coil. The controller generates inductive coupling between the first coil and the second coil when the distance indicated by the parameter is less than a distance threshold. The controller generates resonant coupling between the first coil and the second coil when the distance indicated by the parameter exceeds the distance threshold.