EV DC Charging Reconnection Using Preset Voltage Hold
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Solution Overview
Problem
Electric vehicle charging systems require users to re-swipe a card or re-scan a QR code to resume charging after a disconnection, which increases user operations and reduces convenience.
Innovation Solution
A direct current charging apparatus with a switch module and direct current voltage conversion module that automatically reconnects the charging loop without user intervention, using a preset direct current voltage to maintain connection and prevent alarms, and adjusts based on battery temperature to optimize charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charging loop is disconnected during charging, then user safety is ensured, but the charging must be stopped and requires user re-authentication to resume
Solution Approach 1:
The charging apparatus automatically detects charging loop disconnection and maintains authentication state without requiring user intervention. The system self-manages the authentication token persistence and automatically resumes charging upon reconnection, eliminating the need for users to re-swipe cards or re-scan QR codes.
Solution Approach 2:
The charging apparatus continuously monitors the charging loop status through feedback signals. When disconnection is detected, the system maintains the authentication state and prepares for automatic resumption. Upon reconnection detection, the system automatically resumes charging without requiring user re-authentication, creating a closed-loop control system that adapts to connection changes.
2Reliability
If the authentication state is cleared upon disconnection, then system security is maintained, but user convenience deteriorates due to required re-authentication
Solution Approach 1:
The charging apparatus performs preliminary authentication before charging begins and maintains this authentication state in memory even when the charging loop is disconnected. The system prepares the authentication token in advance and keeps it valid during disconnection periods, so that when the charging loop is reconnected, charging can resume immediately without requiring re-authentication.
Solution Approach 2:
The system cushions against the potential security risk of disconnection by implementing a timed authentication state preservation mechanism. The authentication state is maintained for a predetermined period after disconnection, providing a buffer that allows automatic resumption while still enforcing security boundaries. This cushioning approach balances security requirements with user convenience.
Data Source
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AI summary
This application provides a direct current charging apparatus, a powertrain, and an electric vehicle. The direct current charging apparatus is configured to charge a power battery of the electric vehicle. The direct current charging apparatus includes a direct current charging interface, a switch module, and a direct current voltage conversion module. The direct current charging interface is configured to connect a positive electrode and a negative electrode of a power supply apparatus and a positive electrode and a negative electrode of the power battery to form a charging loop. The switch module is configured to connect or disconnect the charging loop. The direct current voltage conversion module is configured to output a preset direct current voltage to the positive electrode and the negative electrode of the power supply apparatus. According to the direct current charging apparatus, the powertrain, and the electric vehicle provided in this application, after a charging loop between the power battery of the electric vehicle and a charging pile is disconnected, when the charging loop is connected again, charging can be resumed without re-swiping a card/re-scanning a QR code by a user, thereby reducing user operations and improving user experience.