Wireless Charging Pad Coil Alignment With Magnetic Holding
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Solution Overview
Problem
In wireless charging using electromagnetic induction, achieving efficient charging requires precise alignment of the power transmission coil on the charging pad with the power receiving coil of the device, which can be challenging due to variations in resonance frequency and potential magnetic flux leakage or damage.
Innovation Solution
A charging pad design featuring a protruding flat surface with a power transfer coil and a holding mechanism, such as a magnet, to securely position the device and ensure proper alignment, combined with a light emitting unit for visual feedback on charging status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the power transmission coil is fixed inside a case with a ferrite plate below it, then electric power transmission efficiency is improved and magnetic flux leakage is prevented, but the alignment between the power transmission coil and power receiving coil becomes difficult to adjust
Solution Approach 1:
The charging pad incorporates a movable protruding flat surface portion that can shift position, allowing the power transmission coil to dynamically adjust its location. This enables alignment with the power receiving coil while maintaining the protective case structure and ferrite plate configuration for efficient power transmission.
Solution Approach 2:
The charging pad structure is divided into a fixed case portion and a movable protruding flat surface portion. This segmentation allows the power transmission coil to be positioned on the movable portion, which can independently adjust position to achieve alignment without compromising the overall structural integrity or magnetic shielding provided by the case and ferrite plate.
2Ease of operation
If the power transmission coil is exposed on the surface for easy alignment, then alignment with the power receiving coil is improved, but the coil becomes vulnerable to damage from impact
Solution Approach 1:
The protruding flat surface portion containing the power transmission coil is designed to be movable rather than fixed. This allows the coil to be positioned for optimal alignment while remaining protected within the case structure, combining the benefits of surface exposure for alignment with structural protection from impact.
Solution Approach 2:
The power transmission coil is nested within the protective case structure, specifically on the movable protruding flat surface portion. This nesting arrangement allows the coil to be accessible for alignment while being physically protected by the case, preventing direct exposure to impact damage.
3Ease of operation
If the power transmission coil is positioned flexibly for alignment, then ease of placement is improved, but the stability of the coil position deteriorates
Solution Approach 1:
The charging pad includes a light emitting unit that provides visual feedback to indicate when the power receiving coil is properly aligned with the power transmission coil. This feedback mechanism guides the user to achieve optimal alignment while the movable protruding flat surface portion maintains stable positioning once aligned, combining ease of placement with position stability.
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
Facilitates easy and efficient non-contact charging by ensuring accurate alignment of the coils and providing visual cues for proper device placement and charging status, enhancing user experience and reducing the risk of misalignment or damage.
Implementation Method 1
wireless charging using electromagnetic induction
Implementation Method 2
a holding mechanism that allows the charged terminal device at a predetermined position with respect to the power transfer coil
Data Source
AI summary
A charging pad includes a side surface on which a charged terminal device is to be placed face to face. The side surface includes a protruding flat surface portion that is raised from a peripheral edge portion, a power transfer coil that is incorporated in a raised region of the protruding flat surface portion, and a holding mechanism that allows the charged terminal device at a predetermined position with respect to the power transfer coil.