EV Charging Communication Impedance Tuning for Stable Data Exchange
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Solution Overview
Problem
High bit error rates during vehicle charging communication lead to charging abnormalities such as inability to charge or interruptions due to impedance mismatches between charging stations and electric vehicles.
Innovation Solution
A vehicle charging device with a transformer and impedance tuners connected in parallel to communication wires, regulating reactance characteristics to match impedance and improve communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If impedance matching is not performed on communication wires, then device complexity is reduced, but communication reliability deteriorates due to high bit error rates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the impedance parameters of communication wires through impedance tuners. The system monitors communication quality indicators (such as bit error rate) and changes the reactance characteristics of communication wires in real-time to achieve optimal impedance matching, thereby resolving the contradiction between maintaining communication reliability and avoiding excessive device complexity.
Solution Approach 2:
The patent implements feedback mechanisms where the charging device monitors communication quality during the charging process. Based on the monitored bit error rate and communication reliability metrics, the system provides feedback to the impedance tuners to adjust impedance parameters dynamically. This closed-loop feedback system ensures communication reliability while avoiding unnecessary complexity by only activating impedance adjustment when needed.
2Reliability
If impedance tuning components are added to communication wires, then communication quality improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by adding impedance tuning components only at specific critical points in the communication system - specifically at the charging device end of the communication wires. Rather than complicating the entire system, the impedance tuners are localized to where they are most needed for matching impedance between the charging device and electric vehicle, thereby improving communication stability without proportionally increasing overall device complexity.
Solution Approach 2:
The patent implements dynamics by making the impedance characteristics of communication wires adjustable rather than fixed. The impedance tuners can dynamically change reactance values based on real-time communication conditions, allowing the system to adapt to varying impedance mismatches during different charging scenarios. This dynamic adjustment capability improves communication reliability while keeping the base device structure relatively simple.
3Reliability
If signal strength is not monitored and adjusted, then communication process is simpler, but bit error rate increases causing charging abnormalities
Solution Approach 1:
The patent applies self-service by enabling the communication system to automatically monitor and adjust its own impedance parameters without external intervention. The charging device itself performs signal strength monitoring, bit error rate detection, and impedance adjustment through integrated control circuits and impedance tuners. This self-service capability improves data exchange accuracy while minimizing the need for complex external control systems.
Solution Approach 2:
The patent implements preliminary action by performing impedance matching adjustments before charging abnormalities occur. The system proactively monitors communication quality indicators and preemptively adjusts impedance parameters to prevent bit error rate from reaching critical levels. This preliminary intervention approach maintains data exchange accuracy while avoiding the need for complex reactive correction mechanisms.
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
Ensures stable charging communication by adjusting reactance to minimize signal attenuation, preventing charging failures and interruptions.
Implementation Method 1
each of the two impedance tuners includes at least one branch path (including a switch and a capacitor), and each of at least one branch path is connected in parallel with the capacitor of the communication wire
Data Source
AI summary
A vehicle charging device and a method applied to the device are disclosed. The device includes a transformer and two impedance tuners. One side of the transformer has two communication wires to couple with an electric vehicle. Each of the two impedance tuners is connected in parallel to one of the two communication wires. The two impedance tuners are configured to regulate reactance characteristics of the two communication wires. Therefore, the impedance of the communication wires can be gradually regulated in response to the signal strength, such that the vehicle charging device and the electric vehicle communicate in a state approaching impedance matching to prevent charging abnormalities caused by an excessively high bit error rate in data exchange.