Adjustable Inductance Coil Shielding Housing
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Solution Overview
Problem
Existing wireless charging systems face inefficiencies in power transmission and heat generation due to limited inductance control and the need for separate accessories, which complicates standardization and increases the risk of battery deterioration.
Innovation Solution
A coil device with a shielding housing that allows for adjustable inductance by varying the height of its inner wall, integrated into a wireless charging device, enabling efficient power transmission and reducing heat generation through precise inductance control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transmission coil and reception coil are used with a critical number of turns at a predetermined length, then wireless power transmission can be achieved, but the efficiency is limited to a specific region
Solution Approach 1:
The patent changes the inductance parameter of the coil by adjusting the height of the inner wall of the shielding housing. By varying the inner wall height from 0 to 1.5 times the coil height, the inductance can be adjusted to match different standards (9.2 μH to 12.26 μH), enabling the same coil structure to work efficiently across different regions and applications without requiring multiple coil designs
2Reliability
If inductance is controlled by adjusting frequency and fixing inductance in an impedance matching circuit, then power transmission efficiency can be controlled, but heat generation problem due to inductance matching may occur
Solution Approach 1:
Instead of adjusting frequency to control inductance, the patent directly changes the inductance parameter by mechanically adjusting the inner wall height of the shielding housing. This direct inductance adjustment eliminates the need for frequency adjustment and reduces heat generation from impedance matching issues
Solution Approach 2:
The patent replaces the electrical control method (frequency adjustment) with a mechanical structure (adjustable inner wall height) to control inductance. This mechanical substitution provides more direct and efficient inductance control with less energy loss and heat generation
3Reliability
If a control configuration using another impedance matching circuit is required, then inductance matching can be achieved, but device complexity increases
Solution Approach 1:
The patent extracts the inductance adjustment function from complex impedance matching circuits and implements it through a simple mechanical structure - the adjustable inner wall of the shielding housing. This eliminates the need for additional control configurations and impedance matching circuits, reducing device complexity while maintaining inductance matching capability
4Adaptability or versatility
If wireless charging systems are not standard on portable devices, then consumers must purchase separate accessories, but demand for wireless charging systems is low
Solution Approach 1:
The patent designs a universal coil device with adjustable inductance that can meet different wireless charging standards (9.2 μH to 12.26 μH) using the same basic structure. By making the inner wall height adjustable, a single device can serve multiple standards and applications, eliminating the need for separate accessories for different standards and thereby increasing market demand
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 enhances wireless charging efficiency, standardizes coil performance, and reduces heat generation, improving the overall effectiveness and versatility of wireless charging systems.
Implementation Method 1
a wireless charging system includes a wireless power transmitter that supplies electric energy by a wireless power transmission method, and a wireless power receiver that receives electric energy supplied from the wireless power transmitter
Implementation Method 2
efficiency of power transmission and reception may be controlled by adjusting a frequency of a coil and fixing inductance in an impedance matching circuit
Data Source
AI summary
The present embodiment relates to a coil device and a wireless charging device including the same. The coil device according to the present embodiment includes: a coil wound to form a hollow portion; and a shielding housing including a flat part on which the coil is disposed, an inner wall corresponding to a shape of the hollow portion, and an outer wall corresponding to an outer circumferential shape of the coil. The inner wall protruding from the flat part on which the coil is disposed may have a height of 0 to 1.5 times a height of the coil. An inductance of the coil may have a range of 9.2 μH to 12.26 μH.