Power Receiving Coil Unit for Miniaturized Wireless Charging
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Solution Overview
Problem
Miniaturization of portable electronic devices poses a challenge for integrating a power receiving coil without increasing the device's size, and existing solutions do not adequately address this issue.
Innovation Solution
A portable electronic device configuration featuring a power receiving coil unit with two helically wound coils around magnetic bodies, positioned to generate oppositely directed magnetic fluxes, allowing for compact placement around a secondary battery, and a wireless power transmission device with a power feeding coil housed in a concave part to accommodate the portable device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power receiving coil is disposed in a miniaturized portable electronic device, then wireless charging function is achieved, but the device size increases
Solution Approach 1:
The power receiving coil unit is nested around the secondary battery, utilizing the space surrounding the battery rather than allocating separate space for the coil. This nested arrangement allows the coil to be integrated into the existing device structure without increasing overall device volume, thereby achieving wireless charging functionality in miniaturized devices.
Solution Approach 2:
The power receiving coil is arranged in a radial direction around the cylindrical secondary battery, transitioning from a planar two-dimensional layout to a three-dimensional radial configuration. This dimensional change enables the coil to fit within the limited space around the battery, achieving wireless charging without increasing device footprint.
2Ease of operation
If a connector is made easily insertable for battery charging, then charging operation is simplified, but waterproofing becomes difficult
Solution Approach 1:
The mechanical connector insertion system is replaced with an electromagnetic induction system. The power receiving coil unit utilizes electromagnetic induction to transfer power wirelessly from the power transmitting coil to the secondary battery, eliminating the need for physical connector insertion while maintaining ease of operation and achieving waterproofing.
3Use of energy by moving object
If the power receiving coil unit uses two coils generating oppositely directed magnetic fluxes, then power reception efficiency is improved, but coil structure complexity increases
Solution Approach 1:
The power receiving coil unit is segmented into two separate coils (first and second coils) wound around different magnetic bodies. Each coil generates magnetic flux in opposite directions, and when these fluxes are combined, they create a concentrated magnetic field between the magnetic bodies. This segmentation enables improved power reception efficiency while maintaining manageable structural complexity through modular design.
Solution Approach 2:
The magnetic fluxes from the two oppositely directed coils are merged between the first and second magnetic bodies, creating a concentrated and enhanced magnetic field in the region between them. This merging of opposite fluxes improves power reception efficiency by concentrating the electromagnetic energy where it is needed, while the shared power receiving lead simplifies the overall structure.
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
Enables wireless power reception in miniaturized devices without the need for additional space, enhancing convenience and reducing the risk of power transmission failure due to device placement, while maintaining a waterproof structure.
Implementation Method 1
a power receiving coil unit disposed around the secondary battery in the housing, wherein the power receiving coil unit includes a first coil in which a conductive wire is helically wound around a first magnetic body and a second coil in which a conductive wire is helically wound around a second magnetic body
Implementation Method 2
the power feeding device includes a power feeding coil and a housing that contains the power feeding coil
Data Source
AI summary
A portable electronic device includes a housing, a secondary battery disposed inside a tip portion of the housing, and a power receiving coil unit disposed around the secondary battery. The power receiving coil unit has a first coil in which a conductive wire is helically wound around a first magnetic body and a second coil in which a conductive wire is wound helically around a second magnetic body. The first magnetic body and the second magnetic body are disposed between an outer side surface of the secondary battery and an inner side surface of the housing. The first coil and the second coil are located at mutually different positions in a direction around an axis of the secondary battery and are interconnected such that opposed magnetic flux is generated in respective winding axes when current flows the first and second coils.