EV Charging PLC Signal Strength Control for Noise Interruptions
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Solution Overview
Problem
Charging interruptions occur in electric vehicles due to communication interruptions during power line communication (PLC) caused by noise and mismatched communication profiles, leading to unstable charging processes.
Innovation Solution
A charging device and method that utilizes a memory to store multiple power spectral density (PSD) profiles, adjusts communication signal strength based on these profiles, and a PLC controller to transmit signals with the set communication, and a PLC controller to manage communication with a charger, determining communication interruptions and adjusting signal strength to ensure stable charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power line communication (PLC) is used for communication between electric vehicle and charger, then communication can be established through the power line, but communication may be interrupted due to noise from power device operations
Solution Approach 1:
The patent changes communication parameters by switching between different communication methods (PLC and wireless communication) and adjusting communication profiles based on noise conditions. The system monitors communication quality and dynamically changes parameters such as communication method, signal strength, and protocol to maintain reliable communication despite power device noise.
Solution Approach 2:
The patent introduces an intermediary communication system that provides alternative communication paths. When PLC communication is interrupted by noise, the system uses wireless communication (WiFi, Bluetooth, or cellular) as an intermediary to maintain communication between the electric vehicle and charger, ensuring continuous operation.
2Productivity
If multiple electric vehicles connect to the same power line for charging, then charging capacity is increased, but communication association between vehicles and chargers becomes difficult to determine
Solution Approach 1:
The patent implements feedback mechanisms where the system continuously monitors communication quality and charging status. When multiple vehicles are connected, the system receives feedback about communication quality and uses this information to adjust communication parameters, switch communication methods, or reassociate connections to maintain proper vehicle-charger pairing.
Solution Approach 2:
The patent makes the communication system dynamic by allowing real-time switching between PLC and wireless communication methods. When multiple vehicles are connected to the same power line, the system dynamically adjusts communication parameters and selects the most reliable communication path for each vehicle-charger pair, rather than using a fixed communication method.
3Reliability
If communication signal strength is increased to overcome noise, then communication reliability improves, but energy consumption increases
Solution Approach 1:
The patent makes signal strength dynamic rather than fixed. The system monitors communication quality and only increases signal strength when noise is detected or communication quality deteriorates. When communication conditions are good, the system uses lower signal strength to conserve energy, thus optimizing the balance between reliability and energy consumption.
Solution Approach 2:
The patent introduces wireless communication as an intermediary that consumes less energy than high-power PLC transmission. When noise levels are high, the system switches to wireless communication (WiFi, Bluetooth, or cellular) which can maintain communication reliability without requiring the same level of transmission power as noisy PLC conditions.
Data Source
AI summary
A charging device for an electric vehicle includes a memory configured to store a plurality of power spectra density profiles, a communication signal strength setting module configured to set a communication signal strength based on one of the plurality of power spectra density profiles stored in the memory, and a power line communication (PLC) controller configured to transmit a signal having the set communication signal strength to a charger.