3D Wireless Charging Coils with Auto-Tuning and Power Dividers
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Solution Overview
Problem
Conventional 3D wireless charging systems with multiple coils face challenges such as interference, low efficiency, and power distribution issues, leading to potential overheating and reliability problems, especially when charging multiple devices with varying impedance.
Innovation Solution
A 3D wireless power transfer system utilizing multiple resonator coils driven by a single power amplifier, incorporating a differential 1:N power divider, impedance inversion circuits, and auto-tuning circuits with sensors to maintain efficient operation and prevent interference between coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple coils are used for 3D wireless charging, then charging spatial freedom and gap distance are improved, but coil interference and system complexity increase
Solution Approach 1:
The system divides the charging space into multiple independent charging zones, each served by a separate coil module. This segmentation allows spatial freedom in different regions while managing complexity through modular design, where each coil can be controlled independently to reduce interference.
Solution Approach 2:
The patent transitions from planar 2D charging to three-dimensional 3D charging by adding vertical stacking of coils. This dimensional change enables charging at multiple heights and positions in space, providing spatial freedom while the modular coil architecture manages the resulting system complexity.
2Length of stationary object
If multiple coils are used for 3D wireless charging, then charging gap distance is improved, but power distribution efficiency deteriorates
Solution Approach 1:
The system employs dynamic power distribution that adapts to the number and position of devices being charged. The controller dynamically adjusts the operating parameters of each coil and allocates power resources optimally, maintaining high efficiency even when charging multiple devices at varying gap distances.
Solution Approach 2:
The patent changes operating parameters such as frequency, power level, and phase for different coils based on real-time detection of device presence and position. This parameter optimization ensures efficient power transfer across varying gap distances while minimizing energy loss in the multi-coil system.
3Quantity of substance
If multiple coils are used for 3D wireless charging, then multi-device charging capability is improved, but heat dissipation and reliability worsen
Solution Approach 1:
The system segments the total power load across multiple independent coil modules, each handling a portion of the multi-device charging demand. This distribution of power load prevents excessive heat concentration in any single coil, improving thermal management and system reliability while maintaining the ability to charge multiple devices simultaneously.
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor temperature, power consumption, and device positions in real-time. Based on this feedback, the controller dynamically adjusts power allocation to coils, reducing power to overheating coils and redistributing load to cooler coils, thereby managing heat dissipation while maintaining multi-device charging capability.
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 system achieves efficient charging of multiple devices with improved power distribution and reduced heat dissipation, maintaining high efficiency and reliability even with varying impedance loads, allowing for flexible and safe operation.
Implementation Method 1
resonant inductive wireless power transfer (WPT)... power source and a transmitter coil... creates a wireless transfer of electrical energy between two coils
Implementation Method 2
Based on the principles of electromagnetic coupling, resonant-based power sources inject an oscillating current into a highly resonant coil to create an oscillating electromagnetic field. A second coil with the same resonant frequency receives power from the electromagnetic field and converts it back into an electrical current
Implementation Method 3
resonant inductive power transfer using multiple coils... two or more coils, each tuned to resonate at the same frequency... auto-tuning circuits with sensors to maintain efficient operation
Data Source
AI summary
A wireless power transfer (WPT) system is provided to drive multiple resonator coils utilizing one power amplifier. The WPT system may include a power amplifier, a differential 1:N power divider, impedance inversion circuits and multiple resonator coils. The WPT system may further include auto-tuning circuits with sensors that facilitate the efficient driving of the multiple resonator coils. As well, there is provided various 3D shaped coil topologies that are comprised of two or more separate coils. The 3D coil topology designs each provide a particular 3D magnetic field for wireless charging.