3D Wireless Power Transfer Coil for Space-Efficient Charging
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Solution Overview
Problem
Conventional flat plate-type coils used in wireless power transfer (WPT) technology cannot maximize available space in products, restricting battery capacity and WPT efficiency.
Innovation Solution
A WPT coil with a three-dimensional shape is implemented using a flexible substrate, allowing the coil to be configured on both upper and lower surfaces with the same current direction, and can be wound around circular or polygonal structures to optimize space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat plate-type coil is used in wireless power transfer, then the manufacturing process is simple, but the available space in the product cannot be maximized
Solution Approach 1:
The patent transitions from a two-dimensional flat plate coil to a three-dimensional coil structure by winding the flexible substrate multiple times to form layers. This dimensional change allows the coil to occupy and utilize the available three-dimensional space within the product more effectively, thereby resolving the contradiction between manufacturing simplicity and space utilization.
Solution Approach 2:
The patent implements a multi-layered coil structure where multiple windings are nested within each other. The flexible substrate is wound to form inner layers and outer layers, with each layer nested within the space constraints of the product housing. This nesting approach maximizes space utilization while maintaining a compact form factor.
2Device complexity
If a flat plate-type coil is used, then the device structure is simple, but the battery capacity is restricted
Solution Approach 1:
By transitioning from a 2D flat coil to a 3D multi-layered coil structure, the patent increases the effective surface area of the coil without proportionally increasing the device volume. This allows more space to be allocated to the battery, thereby increasing battery capacity while maintaining relatively simple device structure.
Solution Approach 2:
The patent utilizes a flexible substrate that can be wound and shaped to fit within the product's three-dimensional space. This flexibility allows the coil to conform to the available space, maximizing its area within the constrained volume, thereby freeing up more space for the battery.
3Ease of manufacture
If a flat plate-type coil is used, then the manufacturing process is straightforward, but the WPT efficiency is reduced
Solution Approach 1:
The patent employs a three-dimensional multi-layered coil structure that increases the effective surface area and improves magnetic coupling with the receiving coil. This enhanced coupling area directly improves wireless power transfer efficiency by reducing energy loss, while the manufacturing process remains relatively straightforward by utilizing standard flexible substrate materials and winding techniques.
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 three-dimensional WPT coil design maximizes available space, improves WPT efficiency, and expands battery capacity, making it suitable for compact devices with curved or atypical structures.
Implementation Method 1
The WPT technology using magnetic coupling uses induction of a voltage in a secondary coil positioned within a time-variable magnetic field generated by a primary coil.
Implementation Method 2
A WPT coil provided in a WPT device for transmitting or receiving wireless power includes a flexible substrate such as a flexible printed circuit board; and a coil structure provided on the flexible substrate, wherein the WPT coil has a three-dimensional shape rather than a flat plate shape.
Data Source
AI summary
The present invention relates to a WPT coil and an apparatus having same, and more particularly, to a WPT coil configured to have a three-dimensional shape by using a flexible substrate or the like, and an apparatus having same. A WPT coil is provided in a WPT device to transmit or receive wireless power, according to the present invention, the WPT coil comprising: a flexible substrate; and a coil structure provided on the flexible substrate, wherein the WPT coil forms a three-dimensional shape rather than a flat plate shape.