Nested Inductive Coil Geometry for Wireless Power Transfer
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Solution Overview
Problem
Inductive power transmission systems face inefficiencies due to imperfect coupling between transmit and receive coils, leading to higher losses and potential interference with other components.
Innovation Solution
The system positions an inner inductive coil within an outer inductive coil, with a shield core and outer shield concentrating magnetic flux and potentially embedding coils within each other, allowing for tightly coupled, complementary circular shapes to enhance coupling efficiency and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single inductive coil is used for wireless power transmission, then the device structure is simple, but the inductive coupling efficiency is poor leading to higher energy losses
Solution Approach 1:
The patent implements a nested coil configuration where an inner inductive coil is positioned within an outer inductive coil. The inner coil has a first cross-sectional area and the outer coil has a second cross-sectional area that is larger than the first, creating a nested arrangement. This nesting structure increases the overlapping area between transmit and receive coils, thereby improving inductive coupling efficiency and reducing energy losses without significantly complicating the overall device structure.
Solution Approach 2:
The patent transitions from a single-coil design to a multi-coil design by adding spatial dimensions. The nested coils are arranged in different spatial positions with the inner coil centered within the outer coil, creating a three-dimensional configuration. This dimensional expansion allows for increased magnetic flux overlap and improved coupling efficiency while maintaining a compact form factor.
2Productivity
If higher voltages and amplitudes are used to compensate for poor inductive coupling, then power transmission efficiency improves, but interference with other components and heat generation increase
Solution Approach 1:
The nested coil configuration improves inductive coupling efficiency by increasing the overlapping area between coils, allowing for effective power transmission at lower voltages and amplitudes. This reduces the generation of harmful effects such as heat and electromagnetic interference with other components, while maintaining high productivity in power transmission.
Solution Approach 2:
The patent changes the geometric parameters of the coil system by implementing nested coils with different cross-sectional areas. This parameter modification optimizes the magnetic coupling between transmit and receive coils, enabling efficient power transmission at reduced voltage and amplitude levels, thereby minimizing heat generation and interference with other electronic components.
3Adaptability or versatility
If the inductive coils are positioned far apart, then the device design is flexible, but the inductive coupling efficiency decreases
Solution Approach 1:
The nested coil arrangement allows the inner coil to be positioned within the outer coil, maximizing the overlapping area and magnetic flux linkage. This configuration achieves strong inductive coupling while maintaining design flexibility, as the nested structure can be integrated into various device form factors and spatial arrangements without requiring the coils to be positioned far apart.
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 configuration increases the efficiency of power transfer while minimizing heat generation and interference with electronic components, enabling reliable wireless power transmission.
Implementation Method 1
The time varying current in the transmit coil may cause the transmit coil to create varying magnetic flux, which may induce a voltage in the receive coil by inductive coupling
Implementation Method 2
a shield core and outer shield concentrating magnetic flux
Data Source
AI summary
A first electronic device includes an inner inductive coil positioned at least partially around a shield core and a second electronic device includes an outer inductive coil positioned around an aperture. The first electronic device is operable to receive power from and/or transmit power to the second electronic device when a portion of the first electronic device is inserted into the aperture of the second electronic device, positioning the inner inductive coil within the aperture and within the outer inductive coil. When power is being transmitted between the first and second electronic devices, the shield core concentrates magnetic flux around the inner inductive coil and/or the outer inductive coil. In some implementations, an outer shield may be positioned at least partially around the outer inductive coil and may also concentrate magnetic flux around the inner inductive coil and/or the outer inductive coil.