EV Charging Communication Power Control Under Signal Attenuation
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Solution Overview
Problem
Existing communication protocols between electric vehicles and charging stations face challenges in establishing secure connections due to improper installations, leading to attenuation issues that can disrupt communication and prevent charging processes.
Innovation Solution
A device and method that adjust the transmit power of frequency channels based on received power levels, increasing power if below a threshold to ensure reliable communication, with control mechanisms to prevent excessive power that could disrupt other systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmit power is increased to overcome attenuation caused by improper charging station installation, then the communication reliability is improved, but the risk of electromagnetic interference with other systems increases
Solution Approach 1:
The transmit power is made dynamically adjustable rather than fixed. The control unit monitors the received power level and automatically increases the transmit power when attenuation is detected, then reduces it back when communication is successful. This dynamic adaptation allows the system to overcome improper installations without maintaining continuously high power that would cause interference.
Solution Approach 2:
The physical parameter of transmit power is changed on-demand based on communication conditions. The system transitions from a static power level to a variable power level, increasing only when necessary to overcome attenuation and decreasing when communication is established, thus balancing reliability improvement with interference prevention.
2Reliability
If the transmit power is continuously increased to ensure communication, then the communication reliability is improved, but the energy consumption increases
Solution Approach 1:
Instead of continuously transmitting at high power, the system uses periodic transmission attempts with power adjustment. The transmit power is increased only during retransmission attempts when communication fails, and reduced back to normal levels when communication succeeds, creating a periodic pattern of high-power bursts followed by normal operation.
Solution Approach 2:
The transmit power parameter is changed temporarily and selectively based on communication needs. The system maintains low power consumption during normal operation and only increases power when necessary to overcome attenuation, thus minimizing overall energy consumption while ensuring communication reliability when needed.
3Reliability
If the transmit power is increased to overcome attenuation, then the communication reliability is improved, but the electromagnetic compatibility with other charging stations deteriorates
Solution Approach 1:
The transmit power is dynamically adjusted based on real-time communication conditions rather than being set to a high fixed level. The control unit monitors communication success and automatically reduces power after successful connection, ensuring high power is used only temporarily when needed to overcome attenuation, thus maintaining electromagnetic compatibility with other charging stations.
Solution Approach 2:
The system uses feedback from the communication process to control transmit power. The control unit receives feedback about communication success or failure and adjusts the transmit power accordingly - increasing it when communication fails due to attenuation and reducing it when communication succeeds, thereby preventing electromagnetic compatibility issues caused by continuously high power transmission.
Data Source
AI summary
A device for communication of an electric or hybrid vehicle with an electric charging station via at least one data line. The device has at least one transmitter and at least one receiver. The transmitter transmits on n frequency channels with a defined transmit power. The receiver receives power from the charging station for the n frequency channels. The device has a control unit to continue or terminate communication with the charging station depending on the received power. The transmitter is designed to be able to increase the transmit power for the n frequency channels. If the received power falls below a first threshold value, the transmit power of the transmitter is increased for the n frequency channels and the transmitter transmits again on all n frequency channels and the receiver again receives the power from the charging station, as well as an associated communication method.