Wireless Power Transmitter Coil Array Zero-Point Spacing
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Solution Overview
Problem
Magnetic resonance-type wireless charging systems face challenges in implementing an array of transmit coils due to high mutual coupling between closely spaced coils, which complicates system implementation and efficiency.
Innovation Solution
A tiled transmit coil array is designed with each coil tuned to the same resonant frequency, featuring a primary coil and a shield winding, where the spacing between coils corresponds with zero points to minimize mutual coupling, allowing for independent activation of coils and reduced radio frequency radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single large transmit coil is used to achieve a large active area, then positional flexibility is improved, but mutual coupling between closely spaced coils becomes high when implementing an array
Solution Approach 1:
The patent divides a single large transmit coil into multiple smaller transmit coils arranged in an array. Each coil is spaced at zero points where the magnetic field strength is minimal, reducing mutual coupling between adjacent coils while collectively providing a large active charging area that maintains positional flexibility.
2Device complexity
If transmit coils are spaced closely to form an array, then device complexity is reduced, but mutual coupling increases complicating system implementation
Solution Approach 1:
The patent applies local quality by positioning coils at specific locations called zero points, where the magnetic field from adjacent coils is minimal. This localized positioning strategy reduces mutual coupling at critical interfaces between coils while maintaining the overall array structure, simplifying system implementation.
3Productivity
If multiple transmit coils are activated simultaneously, then power transfer efficiency is improved, but radio frequency radiation increases
Solution Approach 1:
The patent implements dynamic control by selectively activating only the transmit coils that are nearest to the receive coil based on real-time positioning detection. This dynamic activation strategy maintains high power transfer efficiency by engaging multiple coils when needed while reducing radio frequency radiation by keeping inactive coils powered down.
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 enhances positional flexibility, efficiency, and reduces excess radiation by minimizing mutual coupling between coils, enabling effective wireless power transfer while maintaining a strong magnetic field within the active charging area.
Implementation Method 1
the transmit coil creates an alternating electromagnetic field and the receive coil takes power from the electromagnetic field and converts it back into electrical current
Implementation Method 2
the transmit and receive coils used in magnetic resonance charging are tuned to the same resonant frequency to improve the energy transfer efficiency
Data Source
AI summary
Techniques for wireless transmitting power are described. An example power transmitting unit includes a magnetic resonance-type transmit coil array comprising a plurality of coil elements, wherein each coil element is tuned to a same resonant frequency. The power transmitting unit also includes a power generating circuitry to deliver current to the transmit coil array to wirelessly power a device within an active wireless charging area of at least one of the plurality of coil elements. Each coil element exhibits a plurality of zero point distances and the spacing between neighboring coil elements corresponds with the plurality of zero point distances.