Resonance Coil Layout for Omnidirectional Wireless Charging
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Solution Overview
Problem
Current wireless charging technologies, such as plate-type wireless charging and long-distance wireless charging using 5.6 GHz signals, are limited by the need for directional placement of devices and low power output, making them inconvenient and inefficient for omnidirectional charging.
Innovation Solution
A wireless charging apparatus and method utilizing a voltage conversion circuit, an excitation coil, and multiple resonance coils arranged in different directions, with a controller to monitor and enable/disable coils based on power status, allowing for omnidirectional charging by adjusting the magnetic field direction and optimizing power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If plate-type wireless charging is used, then low-power devices can be charged wirelessly, but omnidirectional charging cannot be implemented and the device must be placed close to the charging plate
Solution Approach 1:
The charging system is segmented into multiple independent resonance coils arranged in different spatial directions. Each coil can be independently controlled to provide magnetic field coverage in its specific direction, collectively achieving omnidirectional charging coverage without requiring the device to be in a specific position.
Solution Approach 2:
The system dynamically adjusts which resonance coils are activated based on the real-time locations of charging devices. The controller monitors device positions and enables only the necessary coils to provide magnetic field coverage, allowing the charging system to adapt to changing device positions and maintain omnidirectional capability.
2Adaptability or versatility
If multiple resonance coils are used for omnidirectional charging, then charging can be performed from any location, but power consumption increases when power is supplied to all coils
Solution Approach 1:
Instead of activating all resonance coils simultaneously, the system activates only the subset of coils necessary to cover the current device locations. This partial action approach reduces power consumption while maintaining full omnidirectional charging capability when needed.
Solution Approach 2:
The system automatically monitors device positions and self-adjusts which coils are activated based on actual charging needs. This self-service mechanism ensures that power is consumed only when and where it is actually needed, eliminating wasteful power consumption from continuously operating all coils.
3Length of stationary object
If 5.6 GHz signal is used for long-distance wireless charging, then charging can be performed at relatively long distance, but the power output is limited to 4 W ideal power and lower actual working power
Solution Approach 1:
The system uses resonant frequency matching between transmit and receive coils to enhance magnetic coupling efficiency. By operating at resonant frequencies rather than simple electromagnetic induction, the system achieves higher power transfer efficiency at extended distances compared to traditional methods.
Solution Approach 2:
The system dynamically adjusts the resonant frequency and impedance matching based on the distance and load conditions to optimize power transfer efficiency. This dynamic parameter adjustment allows the system to maintain higher power output across varying distances compared to fixed-frequency systems.
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
Enables efficient omnidirectional wireless charging with reduced power consumption and improved charging accuracy, allowing devices to be charged from any location while maintaining high power output.
Implementation Method 1
the excitation coil generates a magnetic field according to the law of electromagnetic induction
Implementation Method 2
Each first resonance coil is connected to the resonant capacitor in series or in parallel to form a resonance circuit, and resonates under excitation of the excitation coil, to further enhance a conduction power of the first resonance coil to the magnetic field through the resonance
Data Source
AI summary
A wireless charging apparatus for a wireless power transmission system and a method are provided. The apparatus includes a voltage conversion circuit, an excitation coil, n first resonance coils, and a controller, where n is greater than or equal to 3. The voltage conversion circuit is connected to the excitation coil and converts a power grid voltage into a high-frequency alternating current voltage. The excitation coil generates a magnetic field based on the high-frequency alternating current voltage. The n first resonance coils are arranged in different directions and conducts the magnetic field, and the controller monitors power statuses of the first resonance coils, and enable or disable the first resonance coils based on the power statuses.