EV Charging Communication via Segmented Partial Connections
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Solution Overview
Problem
Existing methods for establishing communication between electric vehicle charging stations and vehicles are unreliable and costly, particularly with the increasing use of broadband Power Line Communication (PLC) technology, which requires expensive components like chokes for high current charging.
Innovation Solution
The method involves using different physical connections for identification and communication, where the first partial connection of the charging connection is directly connected to the stations, allowing identification to be exchanged securely and reliably, and subsequent communication initiated only after a charging connection is established, utilizing modulation methods like pulse width modulation (PWM) or amplitude modulation, enabling cost-effective implementation with existing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal level analysis is used to determine charging connection, then connection detection is achieved, but reliability is poor and large expensive components like chokes are required
Solution Approach 1:
The patent segments the charging connection into multiple independent partial connections (L1, L2, L3, N, PE, SC, SP). Instead of analyzing signal levels on a single combined connection, the system uses dedicated identification transmission on specific partial connections (SC or SP) separate from the power carrying connections. This segmentation allows reliable connection detection without requiring large choke components, as each partial connection has a dedicated function.
2Adaptability or versatility
If broadband PLC connection is implemented via external conductors, then communication capability is improved, but signal level analysis becomes unreliable and component cost increases
Solution Approach 1:
The patent separates communication functions into dedicated partial connections (SC for control pilot, SP for signal/proximity) distinct from the power carrying external conductors (L1, L2, L3). This allows broadband PLC to be implemented on specific connections without interfering with power transmission, maintaining signal level analysis reliability while enabling advanced communication capabilities.
Solution Approach 2:
The patent introduces an intermediary identification transmission mechanism using dedicated partial connections (SC or SP) as mediators between the charging station and vehicle. This intermediary layer handles identification exchange and communication setup, allowing broadband PLC to operate reliably without compromising the integrity of power transmission or signal level analysis on other connections.
3Device complexity
If identification and communication use the same physical connection, then system simplicity is maintained, but communication reliability deteriorates due to electromagnetic interference from charging currents
Solution Approach 1:
The patent divides the charging connection into functionally separate partial connections, assigning identification transmission and communication to specific connections (SC or SP) while other connections handle power transmission. This physical segmentation isolates communication signals from high-current charging currents, eliminating electromagnetic interference without significantly increasing system complexity, as the separation utilizes already-defined connection functions.
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 approach ensures reliable and cost-effective communication between charging stations and vehicles, secure data exchange, and efficient energy transfer, even in the presence of electromagnetic interference, by using commercially available modules and standard communication protocols.
Implementation Method 1
In the document IEC 61851-1 Annex A it is proposed to provide pulse width modulation (PWM) with which 'low level' signaling can be carried out on the signal conductor SP
Implementation Method 2
In addition, it is planned to implement a broadband communication connection via one of the external conductors L1, L2, L3 using PLC technology (PLC-Power Line Communication)
Data Source
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AI summary
The invention relates to a method and devices that establish communication between a first station and a second station. To this end, an identifier, which identifies the first station and the second station as communication partners for communication, is transmitted between the first and second stations on a first partial connection. After receiving said identifier, communication is started between the first and second stations via a communication connection, wherein the transmission of the identifier via the first partial connection and the communication connection are based on different physical connections. The invention can be used for loading or unloading processes of electrical vehicles, such as autonomous systems in the hospital field, or for vehicles for personal transportation. The invention has the advantage that reliable and cost-effective communication can be ensured between the first and second stations.