Wireless Charging Structure for Thin EV Pads With High Q Factor
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Solution Overview
Problem
Wireless charging devices for electric vehicles face challenges in achieving optimal thickness, charging efficiency, and minimizing heat generation due to varying distances between magnetic and shield units, which affect inductance and resistance.
Innovation Solution
A wireless charging device is designed with a specific formula that adjusts the distance between the magnetic and shield units to maximize the Q factor, ensuring appropriate thickness, high charging efficiency, and minimized heat generation, using a conductive coil unit, magnetic unit, and shield unit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the distance between the magnetic unit and the shield unit is decreased, then the overall thickness of the wireless charging device becomes thinner, but the inductance decreases and the resistance increases, causing charging efficiency to decrease and heat generation to increase
Solution Approach 1:
The patent applies parameter changes by optimizing the distance between the magnetic unit and shield unit to a specific range (0.5mm to 5mm) and controlling the Q factor within a specific range (Q≥100). This parameter optimization resolves the contradiction by finding the optimal balance point where the device achieves both reduced thickness and maintained charging efficiency, rather than simply minimizing distance.
2Loss of energy
If the distance between the magnetic unit and the shield unit is increased, then the inductance increases and the resistance decreases, enhancing charging efficiency and reducing heat generation, but the overall thickness of the wireless charging device becomes thicker
Solution Approach 1:
The patent resolves this contradiction by establishing specific parameter ranges: the distance between magnetic unit and shield unit is controlled at 0.5mm to 5mm, and the Q factor is maintained at Q≥100. These parameter specifications enable the device to achieve high charging efficiency without excessive thickness increase, providing a quantifiable design guideline that balances both requirements.
3Reliability
If the distance between the magnetic unit and the shield unit is adjusted to maximize Q factor, then the wireless charging device achieves appropriate thickness, high charging efficiency, and minimized heat generation
Solution Approach 1:
The patent simplifies the design complexity by providing clear parameter specifications: distance between magnetic unit and shield unit (0.5mm to 5mm) and Q factor (Q≥100). These quantifiable guidelines enable designers to achieve optimal performance without complex iterative optimizations, resolving the contradiction between reliability and design complexity.
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 achieves an appropriate thickness, high charging efficiency, and reduced heat generation, making it suitable for electric vehicles requiring large-capacity power transmission.
Implementation Method 1
The wireless power transmission refers to wirelessly transmitting power through space using inductive coupling, capacitive coupling, or an electromagnetic field resonance structure such as an antenna
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 such as an antenna
Data Source
AI summary
A wireless charging device according to an embodiment can enhance charging efficiency and minimize heat generation while having an appropriate thickness by satisfying a specific expression in which characteristics including the distance between a magnetic part and a shield part and a Q factor are reflected. Therefore, the wireless charging device is useful for a mobility means, such as an electric vehicle, requiring high-capacity power transmission between a transmitter and a receiver.