Asymmetric Shield Spacing in Wireless Power Transmission
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Solution Overview
Problem
Existing wireless power transmission devices suffer from low power transmission efficiency and unnecessary radiation due to insufficient Q factor and electromagnetic interference.
Innovation Solution
A wireless power transmission device design featuring a power feeding unit with a primary coil and shield member, and a power receiving unit with a secondary coil and shield member, where the receiving-side coil and shield member overlap, and the distance between the feeding-side shield member and coil is longer than between the receiving-side shield member and coil, enhancing the Q factor and reducing radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the distance between the feeding-side shield member and coil is increased, then the Q factor and power transmission efficiency improve, but the device size increases
Solution Approach 1:
The patent applies asymmetric design by setting different distances between shield members and coils for the feeding side and receiving side. Specifically, the distance between the feeding-side shield member and feeding-side coil (d1) is made longer than the distance between the receiving-side shield member and receiving-side coil (d2). This asymmetric configuration optimizes the Q factor and power transmission efficiency while controlling overall device size.
2Object-generated harmful factors
If shield members are added to reduce electromagnetic radiation, then electromagnetic interference decreases, but device complexity increases
Solution Approach 1:
The patent applies local quality by strategically positioning shield members only where needed - specifically, shield members are provided on the inner sides of the magnetic cores facing each other, while other regions remain without shields. This localized shielding approach reduces electromagnetic radiation effectively while minimizing the increase in device complexity.
3Object-generated harmful factors
If the receiving-side coil and shield member are disposed to overlap, then radiation to surroundings is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs asymmetric configuration where the receiving-side coil and receiving-side shield member are disposed to overlap each other, while the feeding-side components maintain a different spatial relationship. This asymmetric overlap arrangement on the receiving side effectively reduces radiation to surroundings while the asymmetric design allows for controlled manufacturing tolerances.
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
This design improves power transmission efficiency by increasing the Q factor and reduces electromagnetic interference and radiation, enabling efficient and environmentally friendly power transfer.
Implementation Method 1
a first coil and a second coil that are electromagnetically coupled to each other
Implementation Method 2
a primary magnetic core having two principal surfaces that face each other... a secondary magnetic core having two principal surfaces that face each other
Implementation Method 3
a feeding-side shield member having two principal surfaces that face each other... a receiving-side shield member that has two principal surfaces that face each other
Data Source
AI summary
A wireless power transmission device includes a power feeding unit and a power receiving unit. The power feeding unit and the power receiving unit are disposed so that a principal surface of a primary magnetic core and a principal surface of a secondary magnetic core face each other across a primary winding and a secondary winding. The distance from a surface of a feeding-side shield member which faces a feeding-side coil to a surface of the feeding-side coil which faces the feeding-side shield member, is longer than the distance from a surface of a receiving-side shield member which faces a receiving-side coil to a surface of the receiving-side coil which faces the receiving-side shield member.