Interspiraled Coil Network for Adaptive Wireless Power Matching
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Solution Overview
Problem
Magnetic resonant wireless power transfer systems are highly sensitive to distance changes and misalignments between transmitter and receiver coils, leading to impedance mismatches that affect efficient power transfer.
Innovation Solution
The use of interspiraled switchable coils as an inductive impedance matching network, where multiple driving coils with different inductance values can be selected using switches to compensate for distance changes and misalignments, allowing for optimized coupling between coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If magnetic resonant wireless power transfer is used, then wireless charging capability is achieved, but the system becomes highly sensitive to distance changes and misalignments causing impedance mismatch
Solution Approach 1:
The patent implements a dynamic impedance matching network that automatically adjusts matching parameters in real-time based on detected distance and alignment conditions. The system transitions from static to dynamic adaptation, using control circuits to modify the impedance matching characteristics according to varying operational conditions, thereby maintaining reliable power transfer across different spatial configurations.
Solution Approach 2:
The invention changes the impedance parameters of the matching network dynamically to compensate for distance and misalignment variations. By adjusting the electrical parameters (such as capacitance or inductance values) of the impedance matching circuit based on detected coupling conditions, the system maintains optimal impedance matching despite changes in transmitter-receiver spacing or orientation.
2Device complexity
If fixed inductance coils are used, then the circuit structure is simple, but the system cannot compensate for distance changes and misalignments
Solution Approach 1:
The patent replaces fixed inductance coils with switchable coil configurations that can dynamically alter their effective inductance. By using switches to connect or disconnect specific coil segments, the system creates multiple discrete inductance values that can be selected based on operational needs, providing adaptability while maintaining a relatively simple physical structure.
Solution Approach 2:
The invention divides a single coil structure into multiple segments that can be independently switched. This segmentation allows the system to select different combinations of coil segments to achieve different effective inductance values, providing variable inductance capability without requiring entirely separate coil structures for each inductance value.
3Adaptability or versatility
If multiple switchable coils are implemented for impedance matching, then adaptability to distance changes is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple coil structures into a single integrated assembly where several coils are positioned in close proximity and share common magnetic core or mounting structure. This merging approach allows the system to achieve variable inductance through switching between coils while minimizing the increase in physical complexity, as the coils occupy overlapping or adjacent spatial regions rather than requiring separate mounting structures.
Solution Approach 2:
The invention designs the switchable coil system to serve multiple functions: the same set of coils provides both the primary magnetic coupling function and the impedance matching function. By making the coil structure multi-functional, the system avoids needing separate dedicated components for each function, thereby reducing overall device complexity despite the added switching capability.
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 solution enables efficient and adaptive impedance matching, ensuring stable power transfer across varying distances and misalignments, as demonstrated by the ability to maintain effective power transfer from 7 cm to 25 cm with 1 cm steps, enhancing the reliability of wireless power transfer systems.
Implementation Method 1
magnetic resonant wireless power transfer (MRWPT) system
Implementation Method 2
magnetic resonant wireless power transfer (MRWPT) system
Implementation Method 3
inductive IMN, where several coils are placed in proximity of the transmitter or receiver coils for the impedance matching purpose
Data Source
AI summary
The invention relates to a switchable multiturn coil antenna for transmitting or receiving wireless power in a wireless power transfer system and a corresponding wireless power transfer system. The coil structure includes a planar multiturn primary conductor coil (5) and at least two secondary conductor coils (1, 2, 3, 4) positioned in the plane defined by the primary coil between the turns of the multiturn primary coil, each of the secondary coils having different sizes and lengths providing different inductance and are shorter than the primary coil, wherein each secondary coils is connected to a respective switch (9,10,11, 12) controlled by a tuning controller (23) for individually connecting and disconnecting the coil to a load or to a power supply. An impedance (8) is be connected between the ends of the primary coil and each of the secondary coils extends one turn around a common coil center.