Visible Light Communication for Electric Vehicle Wireless Charging
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Solution Overview
Problem
Current wireless recharging systems for electric vehicles face inefficiencies and incorrect charger retrieval issues when multiple vehicles are recharged simultaneously, leading to potential billing mistakes and reduced recharging efficiency due to the lack of precise communication and connection methods.
Innovation Solution
The implementation of visible light communication using a light emitter and receiver for transmitting identification information between the vehicle and charger, enabling accurate charger retrieval and efficient recharging by guiding vehicles to the correct charging position and establishing wireless connections based on light signal intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless recharging is performed using electromagnetic induction or resonance methods, then recharging can be done without cable connection, but the distance between the vehicle coil and charger coil must be within a certain range, reducing flexibility and efficiency when the vehicle moves outside the range
Solution Approach 1:
The patent replaces the mechanical positioning requirement of electromagnetic induction systems with an optical communication system. Visible light communication transmits identification information wirelessly without requiring precise physical alignment, allowing the vehicle to move freely while maintaining reliable charger retrieval and billing communication.
2Extent of automation
If general wireless connection is used for charger retrieval and billing communication, then wireless recharging can be implemented, but when multiple vehicles are simultaneously recharged, it is difficult for each vehicle to correctly designate and connect to the corresponding wireless charger, leading to billing mistakes
Solution Approach 1:
The patent introduces visible light communication as an intermediary system for transmitting identification information between vehicles and chargers. This intermediary optical channel enables reliable one-to-one matching by transmitting unique identifiers, ensuring that each vehicle correctly identifies and connects to its designated charger for accurate billing, while other vehicles use different identification channels.
3Productivity
If multiple wireless chargers are provided for simultaneous recharging of multiple vehicles, then recharging capacity is increased, but correct charger retrieval and vehicle-charger matching becomes more difficult without physical connection
Solution Approach 1:
The patent segments the identification communication channel into separate visible light transmission paths for each charger. Each charger transmits its unique identification information through dedicated light emission, allowing multiple vehicles to simultaneously retrieve charger information without interference. This segmentation enables scalable simultaneous recharging while maintaining simple retrieval procedures.
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 method ensures correct matching of vehicles with chargers, enhances recharging efficiency, and provides secure and accurate billing information exchange, eliminating the need for additional communication devices and ensuring proper vehicle positioning for optimal recharging.
Implementation Method 1
transmitting identification information of a wireless communication unit to a light receiver of a wireless charger using visible light communication
Implementation Method 2
a wireless recharging system uses an electromagnetic induction method using coils
Data Source
AI summary
Disclosed is a method for efficiently retrieving a charger to supply electric power to an electric vehicle and achieving maximum wireless recharging efficiency, using visible light communication, upon wirelessly recharging the electric vehicle. Wireless visible light communication can be realized, using the existing head lamp installed at the vehicle. Accordingly, it is unnecessary to provide separate communication equipment. In addition, enhanced physical security, efficient charger retrieval, and maximum wireless recharging efficiency can be achieved by virtue of straightness of light.