3D Phased Coil Arrays for Wireless Charging Misalignment
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Solution Overview
Problem
Existing wireless charging technologies face challenges in efficiently charging multiple devices simultaneously and maintaining power transfer due to angular misalignment between transmitter and receiver devices, limited charging distances, and the need for impedance matching networks that are difficult to engineer, especially when devices are in motion.
Innovation Solution
The use of a three-dimensional phased coil array with multiple inductive coils arranged at 90-degree angles on x, y, and z axes to compensate for angular misalignment and allow for efficient wireless power transfer, enabling charging of multiple devices in stationary or moving positions by dynamically adjusting the impedance matching network to maintain efficient power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single inductive coil is used for wireless charging, then the device structure is simple, but it cannot efficiently charge multiple devices simultaneously and is sensitive to angular misalignment
Solution Approach 1:
The single inductive coil is segmented into multiple coils arranged in a three-dimensional array structure. Each coil is positioned at specific orientations (including perpendicular arrangements along x, y, and z axes) to independently target different spatial zones and angular positions, enabling simultaneous charging of multiple devices at various orientations without requiring a single complex adjustable coil
2Adaptability or versatility
If coils are arranged in fixed orientations to cover different angles, then angular misalignment is compensated, but the system cannot adapt when devices are in motion
Solution Approach 1:
The impedance matching network is made dynamic through automated control systems that continuously monitor device positions and orientations. The system dynamically adjusts impedance parameters by selecting appropriate coil combinations from the three-dimensional array and modifying their drive signals in real-time, allowing the fixed coil structure to adapt to moving devices without mechanical adjustment
Solution Approach 2:
A feedback control system monitors the positions and orientations of wireless power receiver devices and uses this information to dynamically select and adjust the active coils in the three-dimensional array. The system measures coupling conditions between transmitter and receiver coils, then automatically optimizes power transfer by adjusting impedance matching parameters based on real-time feedback, enabling continuous adaptation to moving devices
3Area of stationary object
If multiple coils are used to cover three-dimensional space, then charging coverage is improved, but power loss increases due to inefficient coupling
Solution Approach 1:
Rather than uniformly activating all coils in the three-dimensional array, the system applies local quality optimization by selectively activating only the specific subset of coils that are optimally positioned for each receiver device. The impedance matching network locally optimizes coupling conditions for each active coil pair, ensuring high power transfer efficiency in the local charging zone while keeping other coils inactive to minimize overall power loss
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 allows for reliable and efficient wireless charging of multiple devices in three-dimensional space, overcoming alignment issues and maintaining power transfer efficiency even when devices are in motion, thereby enhancing the practicality and versatility of wireless charging systems.
Implementation Method 1
Wireless charging techniques use an electromagnetic field to transfer energy between two or more devices based on inductive coupling
Implementation Method 2
The other device or devices receive(s) the electromagnetic power through resonant inductive coupling and convert the received electromagnetic energy to electrical energy
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
Methods, systems, and devices are disclosed for wirelessly charging electronic devices. In one aspect, a wireless charging transmitter device includes a three-dimensional coil array electrically coupled to a power source and structured to include two or more coils to produce an electromagnetic field that emanates from the three-dimensional coil array, in which the coils are arranged such that at least two coils are perpendicular to each other to direct the electromagnetic field. The wireless charging transmitter device is operable to wirelessly charge an electronic device by providing the electromagnetic field at a receiver coil of the electronic device to convert the electromagnetic energy to electrical energy to power the electronic device.