Wireless Charging Coil Layout for Electromagnetic Wave Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless charging systems for automated guided vehicles and electric vehicles face challenges with increased electromagnetic wave signal components, leading to electromagnetic interference and compatibility issues, particularly when using high power and multi-receiver charging methods, which hinder commercialization and efficiency.
Innovation Solution
A transmitter structure is designed with clock generators, inverters, matching portions, and transmission coils arranged to generate clock signals and voltage/current signals with reverse phases, reducing unnecessary electromagnetic waves by canceling them out, and optimizing the arrangement of transmission coils to increase charging distance and power while minimizing electromotive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high power is used for wireless charging of AGVs and electric vehicles, then charging power and charging distance are improved, but electromagnetic wave signal components increase leading to electromagnetic interference and compatibility issues
Solution Approach 1:
The patent applies the principle of converting harmful electromagnetic waves into beneficial effects by using parasitic capacitors to resonate with transmission coils at the operating frequency. This resonance converts the harmful electromagnetic radiation into useful magnetic coupling, enabling wireless charging while suppressing electromagnetic interference and improving power transfer efficiency.
Solution Approach 2:
The patent changes the electrical parameters of the transmission system by introducing parasitic capacitors that tune the resonant frequency of the transmission coils to match the operating frequency. This parameter adjustment optimizes the electromagnetic field distribution, enhancing charging power while minimizing electromagnetic interference and improving overall system efficiency.
2Productivity
If multiple transmission coils are used for multi-receiver charging, then charging efficiency and versatility are improved, but electromagnetic wave signal components and interference increase
Solution Approach 1:
The patent divides the wireless charging system into multiple independent transmission coil units, each capable of serving different receivers. This segmentation allows simultaneous charging of multiple devices while maintaining individual resonance control for each coil, thereby improving charging efficiency and versatility while managing electromagnetic interference through localized resonance tuning.
Solution Approach 2:
The patent designs transmission coils with universal resonance characteristics that can simultaneously serve multiple receivers with different power requirements and positions. By making each transmission coil unit universally applicable through resonance tuning, the system achieves multi-receiver charging capability while controlling electromagnetic interference through standardized resonance-based suppression.
3Length of stationary object
If transmission coils are arranged to increase charging distance and power, then charging performance is improved, but electromotive force and electromagnetic interference increase
Solution Approach 1:
The patent introduces parasitic capacitors as intermediary elements between the power source and transmission coils. These capacitors act as resonant mediators that enable extended charging distance and improved power transfer by creating a resonant coupling effect, while simultaneously suppressing excessive electromotive force and electromagnetic interference through frequency-selective resonance.
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 effectively attenuates unnecessary electromagnetic waves, enhances charging efficiency and power for single or multiple receivers, and reduces electromagnetic interference, facilitating the commercialization of wireless charging technology for high-power applications.
Implementation Method 1
transmission coils respectively connected to the matching portions and configured to generate magnetic fields towards a reception coil using the transmission coil voltage/current signals
Implementation Method 2
the transmitter may be configured to attenuate unnecessary electromagnetic waves radiated from the transmitter by the inverter voltage/current signals that are output from the inverters and that have the same magnitude and the reverse phases from each other
Data Source
AI summary
A wireless charging system for attenuating electromagnetic waves is provided. The wireless charging system includes a transmitter including a clock generator configured to generate clock signals having reverse phases from each other, inverters configured to output inverter voltage/current signals having a same magnitude and reverse phases from each other using the clock signals generated by the clock generator, matching portions respectively connected to the inverters and configured to output transmission coil voltage/current signals having a same magnitude and reverse phases from each other using the inverter voltage/current signals, and transmission coils respectively connected to the matching portions and configured to generate magnetic fields towards a reception coil using the transmission coil voltage/current signals.