Soft Magnetic Bypass Member for Misaligned Wireless Charging
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Solution Overview
Problem
Existing portable devices face challenges in achieving efficient non-contact charging when the charging device and power receiving coil are not aligned, leading to reduced charging efficiency.
Innovation Solution
Incorporating a bypass member made of soft magnetic material with high magnetic permeability and weak coercive force, which can be strategically positioned between the power receiving unit and the charging device using a transformable accessory member, to enhance electromagnetic induction and improve charging efficiency even when alignment is not optimal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the power supply coil and power receiving coil are brought close to each other for non-contact charging, then charging efficiency is improved, but the device requires precise alignment between the charging device and portable device
Solution Approach 1:
A bypass member including soft magnetic material is introduced as an intermediary between the power supply coil and power receiving coil. This bypass member guides and concentrates magnetic flux, enabling effective electromagnetic induction even when the coils are not precisely aligned. The soft magnetic material has high magnetic permeability and weak coercive force, allowing it to efficiently channel magnetic fields from the charging device to the portable device without requiring strict positional alignment.
2Productivity
If a positioning recess is used to align the band portion with the power supply coil, then charging efficiency is improved for that specific device, but the portable device cannot be effectively charged by other charging devices with different structures
Solution Approach 1:
The bypass member is integrated into the portable device's band or housing in a way that provides universal compatibility with different charging devices. Rather than requiring a specific positioning recess structure, the bypass member passively guides magnetic flux from any power supply coil configuration, enabling the portable device to be charged by various types of chargers while maintaining high charging efficiency.
3Volume of moving object
If the power receiving coil is disposed inside the housing for compact design, then device compactness is improved, but the coil is farther from the charging device reducing electromagnetic induction efficiency
Solution Approach 1:
The bypass member acts as a magnetic flux guide that extends from the housing exterior toward the interior power receiving coil. This intermediary structure channels magnetic fields through the housing material and concentrates them at the location of the power receiving coil, compensating for the distance created by the compact housing design and maintaining high electromagnetic induction efficiency.
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 solution significantly strengthens electromagnetic induction, increasing the induced electromotive force and current generation in the power receiving unit, thereby enhancing charging efficiency and allowing for effective charging even with misaligned charging devices.
Implementation Method 1
the electromagnetic induction is strengthened when power is supplied to the charging device. Accordingly, it is possible to increase an induced electromotive force generated in the power receiving unit
Implementation Method 2
The soft magnetic material included in the bypass member has a weak coercive force and high magnetic permeability
Data Source
AI summary
A portable timepiece includes a case, a power receiving coil accommodated in the case, a bypass member configured to include a soft magnetic material, and a first band that is internally equipped with the bypass member, and that is transformable so as to dispose the bypass member between the power receiving coil and a charging device when charging is performed using the charging device.