Multi-Coil Wireless Transmitter for WPC and PMA Interoperability
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Solution Overview
Problem
Current wireless charging standards, such as WPC and PMA, lack interoperability, requiring specific coil configurations and frequency bands, which limits the flexibility and position freedom of wireless power receivers.
Innovation Solution
A wireless power transmitter with a multi-coil configuration, including a first coil wound into a quadrilateral shape, a second coil wound into a circular shape, and a third coil that overlaps both, along with a controller to selectively apply voltages and control the driving circuit, enabling compatibility with both WPC and PMA standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single coil configuration is used for wireless power transfer, then the device structure is simple, but interoperability between different standards (WPC and PMA) is poor and position freedom of receivers is limited
Solution Approach 1:
The transmitter is divided into multiple independent coil units (first coil, second coil, third coil) with different shapes and characteristics. Each coil is optimized for specific standards or positioning scenarios, allowing the system to segment the power transfer function across multiple specialized components rather than relying on a single general-purpose coil.
Solution Approach 2:
The controller enables each coil to serve multiple functions by selectively activating different coils based on the detected standard (WPC or PMA) and receiver position. The third coil, in particular, can operate in different modes (first mode for WPC, second mode for PMA) to provide universal compatibility across standards while maintaining optimized performance for each.
2Adaptability or versatility
If different coils are used for different standards, then interoperability is improved, but the device structure and control complexity increase
Solution Approach 1:
The controller dynamically selects and configures which coil to activate based on real-time detection of the receiver's standard and position. The system transitions from a static single-coil configuration to a dynamic multi-coil selection mechanism, where coil activation is adjusted in real-time to match the receiver's requirements, optimizing both compatibility and performance.
Solution Approach 2:
The controller changes operational parameters (which coil to activate, voltage levels, frequency) based on the detected standard. When WPC standard is detected, the controller configures the first and second coils with specific parameters; when PMA standard is detected, it switches to the third coil with different parameters, thereby adapting the system behavior to match the required standard.
3Ease of operation
If the receiver must be correctly arranged on a charging coil, then power transfer efficiency is high, but position freedom and ease of operation are reduced
Solution Approach 1:
The system adds spatial dimensionality to the coil arrangement with the third coil overlapping the first and second coils. This three-dimensional coil configuration creates multiple overlapping magnetic field zones, allowing the receiver to be charged effectively across a larger spatial volume rather than requiring precise alignment with a single planar coil, thereby enhancing position freedom while maintaining reliability.
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
The solution allows for seamless interoperability between WPC and PMA standards, enhancing the position freedom of wireless power receivers and supporting multiple standards with a single transmitter design.
Implementation Method 1
a first coil configured to convert a current into a magnetic flux
Data Source
AI summary
The present disclosure relates to a wireless power transfer method, a wireless power transmitter and a wireless charging system in a wireless power transfer field. That is, a wireless power transmitter configured transfer power to a wireless power receiver in a wireless manner, the transmitter configured to a first coil configured to convert a current into a magnetic flux, a second coil configured to be adjacent to the first coil on a plane, a third coil configured to have a different shape from the first and second coils and have at least part thereof which overlaps the first and second coils, respectively, and a controller configured to determine a coil to be activated among the first, second and third coils.