EV Charging PLC Link With Adaptive Power for Signal Attenuation
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Solution Overview
Problem
The existing communication protocols between electric or hybrid vehicles and charging stations face challenges in establishing a secure and reliable connection due to signal attenuation, which can lead to failed charging processes if the charging station is installed incorrectly, resulting in communication termination.
Innovation Solution
A device with a transmitter and receiver that adjusts transmission power across multiple frequency channels based on reception power, increasing power when reception falls below a threshold to ensure connection establishment and maintain communication, while limiting power to prevent electromagnetic compatibility issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission power is increased to compensate for signal attenuation, then the communication reliability is improved, but electromagnetic compatibility issues may occur
Solution Approach 1:
The transmission power is made dynamically adjustable based on the measured signal attenuation. The system transitions from a static fixed transmission power to a dynamic adaptive power level, allowing the transmitter to increase power only when attenuation exceeds a threshold, thereby maintaining reliability while minimizing electromagnetic interference under normal conditions
Solution Approach 2:
The transmission power parameter is changed adaptively based on the received signal quality. The system monitors the signal attenuation and adjusts the transmission power parameter in response, changing it from a constant value to a variable parameter that responds to environmental conditions, thus resolving the contradiction between reliability and electromagnetic compatibility
2Reliability
If the transmission power is increased to overcome signal attenuation, then the probability of successful charging is improved, but energy consumption increases
Solution Approach 1:
The transmission power is dynamically adjusted based on actual signal attenuation measurements rather than maintaining a constantly high power level. This dynamic approach ensures successful charging communication when needed while minimizing energy consumption during normal operating conditions
Solution Approach 2:
The transmission power parameter is changed from a fixed high value to a variable value that responds to signal quality. The system only increases power when attenuation exceeds a threshold, optimizing the balance between charging success probability and energy consumption
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 solution enhances the probability of successful charging by adapting transmission power to compensate for signal attenuation, ensuring reliable communication and preventing EMC disruptions, thereby improving the availability of charging stations.
Implementation Method 1
ISO 15118 specifies HomePlug Green PHY as the physical layer. This is a powerline communication (PLC) method derived from HomePlug AV.
Implementation Method 2
Based on varying degrees of signal attenuation, the SLAC mechanism enables the vehicle to identify the charging station to which it is physically connected
Data Source
Figure 1
AI summary
The invention relates to a device (1) for communication between an electric or hybrid vehicle and an electric charging station (2) via at least one data line (9), wherein the device comprises at least one transmitter (3) and at least one receiver (4), wherein the transmitter (3) is configured to transmit on n frequency channels with a defined transmission power, wherein the receiver (4) is configured to receive the received power from the charging station (2) for the n frequency channels, wherein the device comprises a control unit (5), wherein the control unit (5) is configured to continue or terminate communication with the charging station (2) depending on the received power, wherein the transmitter (3) is configured to be able to increase the transmission power for the n frequency channels, and wherein the control unit (5) is configured such that, if the received power falls below a first threshold,the transmit power of the transmitter (3) for the n frequency channels is increased and the transmitter (3) transmits again on all n frequency channels and the receiver (4) again receives the received power from the charging station (2), as well as an associated communication method.