Electric Vehicle Charging Communication via AC Current Modulation
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Solution Overview
Problem
Current communication methods between power supply stations and electric vehicles, such as the CPLT standard, are inadequate for transmitting additional information like state of charge (SOC) and electric power cost during charging and discharging, requiring significant changes to existing standards.
Innovation Solution
A method where electric vehicles and power supply stations use a predetermined correspondence relationship to transmit information by modifying the magnitude of AC current drawn or supplied, allowing for the transmission of additional data without conflicting with the existing CPLT communication standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the CPLT communication standard is used for transmitting information between power supply station and electric vehicle, then the communication method is simple and standardized, but the amount of information that can be transmitted is limited
Solution Approach 1:
The patent merges the communication function with the power supply function by using the power cable to carry both electrical power and communication signals. The communication signals are superimposed on the power lines, allowing simultaneous power transmission and data exchange without requiring separate communication wiring, thus increasing information transmission capacity while maintaining compatibility with existing power infrastructure.
Solution Approach 2:
The power cable system is made multi-functional by enabling it to serve both as a power transmission medium and a communication channel. The same physical infrastructure (power cable and connector) is used for both supplying electrical power to the electric vehicle and transmitting various information signals (charging status, power cost, SOC, etc.), eliminating the need for dedicated communication lines.
2Loss of information
If additional information channels are added to transmit more data, then the information transmission capacity increases, but the device complexity increases
Solution Approach 1:
Multiple communication signals (charging permission, upper limit current, power cost, SOC, etc.) are combined and transmitted through the existing power cable infrastructure. By superimposing these signals on the power lines already present in the system, the patent avoids adding separate communication cables or complex wireless communication hardware, thus increasing information capacity without proportionally increasing device complexity.
Data Source
AI summary
A method of communication between a power supply station and an electric vehicle is provided. In the method, the electric vehicle prepares a first information represented by a numerical value to be transmitted to the power supply station and transmits the first information by causing an AC power, which the electric vehicle draws from the power supply station, to have a current value corresponding to the first information based on a predetermined correspondence relationship. The power supply station receives the first information based on a magnitude of the current drawn by the electric vehicle and the first predetermined correspondence relationship.