EV Charging Relay Circuit Using CC Signal Auto Power Switching
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Solution Overview
Problem
Current electric vehicle control devices require manual power supply, leading to inefficiencies and safety concerns due to high leakage current when not in use, especially during AC charging.
Innovation Solution
A power supply circuit with a CC signal detection and amplification circuit and a relay control circuit that automatically switches power to the vehicle control device when the charging plug is inserted, preventing power consumption when not charging and ensuring safe and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle control device is supplied with power manually, then the device can operate during charging, but the leakage current is large and the vehicle lacks electricity in long-term unused state
Solution Approach 1:
The system automatically detects the charging plug insertion through the CC signal and activates the vehicle control device power supply without manual intervention. The relay control circuit autonomously switches the power supply state based on the detection result, eliminating the need for manual power supply operations.
Solution Approach 2:
The system uses the CC signal from the charging plug as feedback to control the power supply state of the vehicle control device. When the charging plug is inserted, the CC signal triggers the relay control circuit to close the relay, supplying power to the control device. When the plug is removed, the circuit opens and power is cut off.
2Ease of operation
If the vehicle control device is continuously powered, then the device is always ready for operation, but power is wasted when the vehicle is not in use
Solution Approach 1:
The power supply state of the vehicle control device is dynamically adjusted based on the charging status. The relay control circuit switches the power supply on when charging is detected and off when charging is not active, making the system adaptable to different operational states rather than maintaining a fixed power supply mode.
Solution Approach 2:
The power supply to the vehicle control device is activated periodically only when needed (during charging operations) rather than continuously. The system enters a low-power state during non-charging periods and activates only when the charging plug is inserted, reducing overall energy consumption while maintaining operational readiness when required.
3Use of energy by stationary object
If manual power supply is used for the vehicle control device, then power consumption can be controlled, but the operation process becomes complex and requires human intervention
Solution Approach 1:
The relay control circuit automatically detects the charging plug insertion status through the CC signal and autonomously controls the power supply to the vehicle control device. The system performs the power supply control function itself without requiring external manual intervention, achieving self-service operation.
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
The solution enables automatic power supply to the vehicle control device during charging, reducing manual intervention and minimizing power consumption when not in use, thereby enhancing operational efficiency and safety.
Implementation Method 1
A relay coil is provided in series in the relay control circuit. The relay coil is used for controlling the switching of the first contact and the second contact.
Implementation Method 2
a CC signal detection and amplification circuit for being connected with the vehicle plug and the vehicle control device
Data Source
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AI summary
Disclosed are an electric vehicle and a power supply circuit for a vehicle control device with alternating current (AC) charging thereof. The power supply circuit for a vehicle control device with alternating current (AC) charging thereof includes a CC signal detection and amplification circuit, a relay and a relay control circuit for controlling the relay. The CC signal of the vehicle charging plug is amplified by the CC signal detection and amplification circuit, and the relay contacts are driven to turn on the power supply terminal of the vehicle control device. Self-lock powering is achieved by the relay control circuit. After it is detected that the vehicle charging plug is turned off, the relay control circuit is turned off and charging is stopped. In the circuit, the relay control circuit is turned off in the case of no charging, and the vehicle control device cannot consume power without power supply. When the charging plug is inserted, the vehicle control device is supplied power with the tumed-on relay. The automatic power supply control of the vehicle control device is achieved without the affection of sampling the charging connection confirmation signal CC, so as to reduce manual operation and improve the operation efficiency and the safety under charging.