Segmented Spiral Coil Layout for Misalignment-Tolerant Wireless Charging
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Solution Overview
Problem
Existing wireless power transfer systems suffer from reduced positioning freedom of the receiver devices due to sensitivity to lateral or angular misalignments, and difficulty in efficiently supplying power to multiple devices simultaneously.
Innovation Solution
A wireless power transfer mechanism using coil geometries composed of at least two spirals electrically connected and folded or bent with respect to each other, combined with a system controller to adjust the magnetic field based on receiver position and orientation, and an adjustable capacitor network to dynamically adjust impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional wireless power transfer systems are used, then power can be transmitted wirelessly, but the receiver device has reduced positioning freedom due to sensitivity to lateral or angular misalignments
Solution Approach 1:
The transmitter coil is divided into multiple independently controllable coil segments arranged in an array. Each segment can be individually activated or deactivated based on the receiver's position, allowing the system to maintain efficient power transfer across a larger spatial volume and reducing sensitivity to misalignment.
Solution Approach 2:
The system dynamically adjusts the excitation state of individual coil segments based on real-time receiver position and orientation detection. By selectively activating only the segments that are optimally positioned relative to the receiver, the system maintains high transfer efficiency while allowing greater positioning freedom.
2Quantity of substance
If traditional wireless power transfer systems are used, then power can be transmitted wirelessly, but it is difficult to efficiently supply power to multiple receiving devices simultaneously
Solution Approach 1:
The transmitter array is segmented into multiple independently controllable coil elements. This segmentation allows the system to simultaneously serve multiple receivers by activating different segments for different receivers, thereby increasing both the number of devices that can be powered and maintaining efficiency through optimized segment-to-receiver matching.
Solution Approach 2:
Each coil segment in the array can serve multiple functions: powering different receivers at different positions, adapting to various receiver orientations, and operating at different power levels. This multi-functionality enables efficient simultaneous power supply to multiple devices with diverse positioning requirements.
3Ease of operation
If wireless power transfer is implemented at extended transmission distances, then positioning freedom is improved, but power transfer efficiency decreases
Solution Approach 1:
By segmenting the transmitter into multiple coils arranged in an array, the system creates an extended transmission volume. Receivers at different distances and positions can be served by optimally positioned segments, maintaining efficiency even at extended transmission distances where traditional single-coil systems would fail.
Solution Approach 2:
Different segments of the transmitter array are selectively activated based on the local positioning of receivers. This local optimization ensures that each receiver is served by the most appropriate transmitter segment, maintaining high transfer efficiency across the entire extended transmission volume rather than using a uniform approach.
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
Provides high-efficiency wireless power transmission with improved positioning freedom, enabling simultaneous charging of multiple receivers at extended distances and uniform magnetic field distribution.
Implementation Method 1
at least one transmitter coil acting as inductive element of at least one inductive-capacitive resonator that upon excitation with a time-varying voltage produces a time varying electromagnetic field causing a circulating electric field through at least one receiver coil of a wireless power receiver device
Data Source
AI summary
A wireless power transmitter device is provided. The wireless power transmitter device comprises: at least one transmitter coil acting as inductive element of at least one inductive-capacitive resonator that upon excitation with a time-varying voltage produces a time varying electromagnetic field, causing a circulating electric field through at least one receiver coil of a wireless power receiver device for charging the wireless power receiver device, wherein the at least one transmitter coil is composed of at least two spirals electrically connected to each other, wherein the at least two spirals are oriented in space to form a composed geometric figure. A corresponding wireless power receiver device is further provided.