Sample and Hold Logic for EV Control Pilot Signal Detection
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Solution Overview
Problem
Existing charging systems for electric vehicles face challenges in accurately detecting the level of control pilot signals, leading to inefficiencies and increased burden on charging controllers due to signal ripple and delay, which affects battery charging efficiency.
Innovation Solution
A device comprising a switch controller and a sample and hold logic unit that samples and stabilizes the control pilot signal, maintaining its level until the switch control signal returns to high, reducing misdetctions and burden on the charging controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the control pilot signal is directly detected without sampling and holding, then the detection process is simple, but the signal level detection accuracy deteriorates due to signal ripple and delay
Solution Approach 1:
The sample and hold logic unit performs preliminary sampling of the control pilot signal at specific timing (when switch control signal is high) before the charging controller detects the signal level. This preliminary action captures the signal at the optimal moment, preventing ripple and delay from affecting the detection accuracy.
Solution Approach 2:
The sample and hold logic unit acts as an intermediary between the control pilot input signal and the charging controller. It processes the signal by sampling and holding, then outputs a stabilized signal to the charging controller, thereby improving detection accuracy without requiring the charging controller itself to be more complex.
2Stability of the object's composition
If the control pilot signal is sampled and held to improve detection accuracy, then the signal stability improves, but the device complexity increases
Solution Approach 1:
The sampling operation is performed in advance at the moment when the switch control signal is high, capturing the signal level before ripple and delay can occur. The held value maintains this stable level throughout the charging controller's detection period, ensuring signal stability.
Solution Approach 2:
The sample and hold logic unit serves as an intermediary that stabilizes the signal before it reaches the charging controller. By placing this stabilization function in a separate logic unit rather than within the charging controller itself, the signal stability is improved while the charging controller remains relatively simple.
3Speed
If the charging controller continuously monitors the control pilot signal, then the detection responsiveness improves, but the controller burden increases
Solution Approach 1:
The sampling function is extracted from the charging controller and placed in a separate sample and hold logic unit. This extraction allows the charging controller to simply read the held value from the logic unit without needing to continuously monitor the fluctuating control pilot signal, reducing the controller burden while maintaining detection responsiveness.
Solution Approach 2:
The sample and hold logic unit autonomously performs the sampling operation at the appropriate timing based on the switch control signal, without requiring continuous intervention from the charging controller. The logic unit serves itself by automatically capturing and holding the signal level, then making it available to the charging controller when needed.
Data Source
AI summary
An apparatus for detecting a level of a control pilot signal includes: a switch controller configured to output a switch control signal using a control pilot input signal, which was outputted from an electric vehicle supply equipment; and a sample and hold logic unit configured to sample and hold the control pilot input signal, based on the outputted switch control signal, in order to output a control pilot output signal.