Segmented Transmit Coil for Wireless Power Transfer
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Solution Overview
Problem
Current wireless power transfer systems face inefficiencies due to heating issues caused by strong magnetic field concentrations near receiving devices, which can lead to damage and reduced power transfer efficiency.
Innovation Solution
A transmit coil configuration with multiple taps allows for adjustable active area control, reducing heating by aligning the transmit coil's size with the receive coil's geometry, and incorporating a magnetic secured transmission (MST) coil for improved power transfer and data communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transmit coil operates at high power to improve wireless power transfer efficiency, then power transfer efficiency is improved, but thermal losses increase causing heating issues
Solution Approach 1:
The transmit coil is divided into multiple independently controllable coil segments. Each segment can be individually activated or deactivated based on the receive coil's position and size, allowing the system to optimize power transfer while minimizing the active area to reduce thermal losses and heating effects.
Solution Approach 2:
The system dynamically adjusts which coil segments are active based on real-time detection of the receive coil's position, size, and orientation. This dynamic reconfiguration allows the transmit coil to adapt its active area to match the receive coil's geometry, improving coupling efficiency while minimizing unnecessary thermal generation in inactive regions.
2Adaptability or versatility
If the transmit coil area is increased to improve coupling with various device sizes, then adaptability is improved, but magnetic field concentration and heating increase
Solution Approach 1:
The transmit coil is segmented into multiple independent sections that can be selectively activated. This allows the system to accommodate various device sizes by activating only the necessary segments, providing adaptability without requiring the entire coil to be active, thereby reducing magnetic field concentration and heating in any single area.
Solution Approach 2:
Different segments of the transmit coil can be activated based on the local requirements of the receive coil's position and size. This local quality approach ensures that magnetic field energy is concentrated only where needed for power transfer, rather than being distributed across the entire coil area, thus reducing overall heating while maintaining adaptability.
3Device complexity
If the transmit coil uses a fixed configuration to simplify design, then device complexity is reduced, but power transfer efficiency varies with device geometry
Solution Approach 1:
The system employs dynamic control of coil segments based on detected receive coil characteristics. While the physical coil structure remains fixed, the electrical configuration is dynamically adjusted by activating specific segments, providing adaptability to various device geometries without requiring multiple physical coil designs or complex reconfiguration mechanisms.
Solution Approach 2:
The system uses feedback from the detection of receive coil position, size, and orientation to determine which transmit coil segments to activate. This feedback mechanism allows the system to automatically optimize power transfer efficiency for different device geometries while maintaining a simple fixed physical coil structure.
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 enhances power transfer efficiency by reducing thermal losses and improving magnetic field distribution, allowing for better coupling and increased pass rates in MST data transmission, while accommodating various device sizes and shapes.
Implementation Method 1
a transmitter includes a transmission coil that efficiently transmits the wireless power
Implementation Method 2
the receiver coil receives the wireless power generated by the transmit coil
Implementation Method 3
heating issues caused by strong magnetic field concentrations near receiving devices
Data Source
AI summary
In some embodiments, a transmit coil configuration is provided. A coil configuration for a wireless transmitter according to some embodiments can include a plurality of turns coupled between a first tap coupled to an innermost turn and a second tap coupled to an outermost turn; and at least one adjustment tap coupled to at least one turn of the transmitter coil between the innermost turn and the outermost turn. The transmission coil can include an MST coil coupled to the second tap of the transmission coil. In some embodiments, the MST coil can include a plurality of turns arranged in one of a circle, an oval, an egg shape, or a square shape.