DC Charging Gun Unlocking Sequence to Prevent Arc Discharge
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Solution Overview
Problem
Current direct-current charging guns require users to make round trips between the charging pile and the gun to stop and resume charging, leading to a poor user experience, especially in scenarios without network access and requiring multiple trips for operation.
Innovation Solution
A direct-current charging gun equipped with an unlocking mechanism, a safety mechanism, and a communication mechanism that allows for remote interruption of charging via a signal change, ensuring the gun is safely locked and unlocked without direct user intervention, thereby preventing arc discharge and simplifying the charging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If charging is stopped by using existing methods (APP, pile-end screen, card swiping, or stop button), then charging can be interrupted, but users must make multiple trips between the charging pile and charging gun, leading to poor user experience
Solution Approach 1:
The charging gun is equipped with an automatic unlocking mechanism that automatically unlocks after charging stops, eliminating the need for users to manually return the gun to the charging pile. The system serves itself by automatically returning the gun to the charging pile through the unlocking mechanism and guide structure, freeing users from repeated trips.
Solution Approach 2:
A guide structure and track system serve as intermediaries between the charging gun and charging pile. The guide structure guides the charging gun along a predetermined path back to the charging pile after automatic unlocking, enabling automated return without user intervention.
2Speed
If the charging gun is directly pulled out during charging, then the user can quickly remove the gun, but arc discharge phenomenon occurs causing safety accidents
Solution Approach 1:
The system performs preliminary action by automatically stopping charging and unlocking the charging gun before the user pulls it out. The control unit detects gun pulling intent and preemptively stops power delivery and unlocks the locking mechanism, preventing arc discharge that would occur if the gun were pulled during active charging.
Solution Approach 2:
The system uses feedback from the locking mechanism and control unit to monitor charging state and gun position. When the gun is pulled or charging needs to stop, the feedback signal triggers automatic charging cessation and unlocking, creating a closed-loop safety system that prevents arc discharge.
3Productivity
If automatic unlocking is implemented without communication mechanism, then the gun can be unlocked quickly, but charging cannot be safely interrupted first
Solution Approach 1:
The communication mechanism establishes a feedback loop between the charging pile and charging gun. The control unit continuously monitors charging status and gun position, and when gun pulling is detected or charging needs to stop, it sends feedback signals to coordinate safe charging interruption and automatic unlocking, ensuring both speed and safety.
Data Source
AI summary
The invention relates to the field of electric vehicles, and particularly provides a direct-current charging gun and charging pile. The invention aims to solve the problem that a user, when operating a current direct-current charging gun, needs to make round trips back and forth between a charging pile and a charging gun to stop charging, pull out the gun and return the gun, thereby degrading the user experience. For this purpose, the direct-current charging gun of the invention comprises an unlocking mechanism, a safety mechanism and a communication mechanism, wherein the safety mechanism is connected to the communication mechanism and the unlocking mechanism separately; the unlocking mechanism is used for locking when the direct-current charging gun is in use, and for unlocking when the direct-current charging gun is not in use; the communication mechanism is configured to interrupt a direct current in the charging gun when being triggered; and the safety mechanism is configured not to trigger the communication mechanism in an unarmed state and to lock the unlocking mechanism, and triggers the communication mechanism first and then unlocks the unlocking mechanism during arming. It can be avoided that the user makes round trips back and forth between the charging pile and the charging gun, thereby improving the user experience.