Wireless Charging Magnetic Unit for High-Temperature Inductance Stability
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Solution Overview
Problem
Wireless charging devices experience reduced efficiency and safety issues due to high-temperature heat generation, which affects the magnetic characteristics and stability, leading to potential damage and decreased performance.
Innovation Solution
A wireless charging device with a coil unit and a magnetic unit designed to maintain inductance deviation and magnetic permeability change rates within specific ranges at elevated temperatures, ensuring high-temperature stability and enhanced charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If wireless charging operation is performed using conventional coil and magnetic units, then power transmission function is achieved, but heat is generated due to resistance and magnetic loss causing inductance deviation and reduced charging efficiency
Solution Approach 1:
The patent applies parameter changes by selecting magnetic units with specific temperature coefficients of inductance (≤+50 ppm/℃) and operating the wireless charging device within optimized temperature ranges. This controls the physical parameters of the magnetic unit to minimize heat generation effects and maintain stable inductance values during charging operation, thereby improving charging efficiency while managing temperature rise.
2Productivity
If high power wireless charging is implemented, then charging speed is improved, but magnetic unit stability deteriorates due to temperature rise causing deformation and potential breakage
Solution Approach 1:
The patent selects magnetic units with low temperature coefficients of inductance (≤+50 ppm/℃) to maintain stable electrical parameters during high-power operation. This parameter selection ensures that even under high temperature conditions from fast charging, the magnetic unit's inductance remains stable, preventing deformation and breakage while enabling high charging speeds.
Solution Approach 2:
The patent employs prior cushioning by pre-selecting magnetic units with inherently low temperature coefficients and designing the system to operate within temperature ranges that prevent excessive heat accumulation. This proactive approach cushions against the thermal stresses that would otherwise cause magnetic unit deformation and failure during high-power charging operations.
3Device complexity
If conventional magnetic units are used without temperature compensation, then device complexity is reduced, but inductance deviation occurs at elevated temperatures reducing charging performance
Solution Approach 1:
The patent achieves inductance stability without adding complex temperature compensation circuits by carefully selecting magnetic units with temperature coefficients of inductance ≤+50 ppm/℃. This material parameter selection inherently compensates for temperature effects, maintaining stable inductance values across the operating temperature range while keeping the device structure simple and cost-effective.
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 provides excellent charging efficiency and stability at high temperatures, minimizing the risk of magnetic unit deformation and breakage, and maintaining efficient power transmission in electric vehicles and personal transportation devices.
Implementation Method 1
The wireless power transmission refers to wirelessly transmitting power through space using inductive coupling
Implementation Method 2
The wireless power transmission refers to wirelessly transmitting power through space using inductive coupling, capacitive coupling, or an electromagnetic field resonance structure
Data Source
AI summary
A wireless charging device according to one embodiment has an inductance deviation at 80° C. of 0 or more, and has a magnetic part that has a permeability change rate (ΔP1) of 0/° C. or more, thus having excellent high-temperature stability, and being able to maintain excellent charging efficiency even at high temperature. Therefore, the wireless charging device can be useful in a transportation means such as an electric vehicle requiring large-capacity power transmission between a transmitter and a receiver.