Coil Unit Voltage Gradient for Compact Wireless Power
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in maintaining a compact size due to the need for electrical insulation between high-voltage components, leading to increased physical size and complexity.
Innovation Solution
A coil unit design with a coil wire wound around a winding axis, featuring a hollow portion and an accommodation case with a metal member, where the voltage gradient allows for reduced insulation distances between the coil and metal components, including fastening members and a metal case, thereby minimizing the overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick electrically-insulating member is placed between the power-transmitting coil and the base plate to ensure electrical insulation, then electrical insulation is improved, but the size of the case increases
Solution Approach 1:
The patent changes the voltage parameter distribution along the coil by connecting the outer peripheral portion to a lower voltage potential and the inner peripheral portion to a higher voltage potential. This parameter change allows the insulation distance to be optimized based on actual voltage differences rather than using a uniformly thick insulating member, thereby reducing case size while maintaining electrical insulation reliability.
2Reliability
If a long creepage distance is maintained between the bolts and the power-receiving coil to prevent electrical breakdown, then electrical insulation is improved, but the physical size of the coil unit increases
Solution Approach 1:
The patent applies voltage parameter optimization by connecting the outer peripheral portion of the coil to a lower voltage potential. This creates a voltage gradient that reduces the required creepage distance between metal fastening members and the coil, allowing for a more compact coil unit design while maintaining electrical insulation reliability.
3Reliability
If a sufficient insulation distance is maintained between the metal member and the power-receiving coil to prevent electrical breakdown, then electrical insulation is improved, but the physical size of the coil unit increases
Solution Approach 1:
The patent optimizes the voltage parameter distribution by connecting the outer peripheral portion to lower voltage and the inner peripheral portion to higher voltage. This parameter optimization reduces the insulation distance required between metal members and the coil, enabling a more compact coil unit design while ensuring electrical insulation reliability.
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 design reduces the physical size of the coil unit by optimizing insulation distances based on voltage gradients, allowing for efficient power transmission while maintaining electrical safety and structural integrity.
Implementation Method 1
high-voltage AC current flows through the power-transmitting coil
Data Source
AI summary
A coil unit includes a coil and an accommodation case accommodating the coil. The coil is formed of a coil wire wound around a winding axis. A hollow portion is formed in a position in which the winding axis passes. The coil includes an outer peripheral portion located in an outer peripheral edge of the coil, and an inner peripheral portion located along an inner peripheral edge of the coil. A voltage on the inner peripheral portion is higher than a voltage on the outer peripheral portion.