Electric vehicles cannot do without battery support, and as a battery energy supply, charging pile is a very important device, the safety of charging pile is also related to the charging safety of the vehicle, in order to ensure the charging safety of the vehicle, charging pile has automatic power off function, talking about the need for the structure and work of the charging pile itself, taking the current DC charging pile as an example, Charging pile in the design process has charge protection, overvoltage and overcurrent protection and other functions.
In terms of its overcurrent protection, when the current reaches the set current, there will be an automatic power failure. According to its internal structure, when the DC charging pile works, the auxiliary power supply is supplied to the control system such as the main control unit, display module, protection control unit, signal acquisition unit and swipe card module.
When the vehicle's main circuit input circuit breaker has overload, short circuit and leakage protection functions; The output contactor controls the power supply on and off; The core of the charging pile, the charging controller is used to control the charging voltage, charging time, which is similar to the nerve center of the brain, through the power line to detect the voltage transmitted to the vehicle battery, to determine whether to continue to charge the battery, so that for this controller can achieve full stop function.
To put it simply, the work of the charging pile requires electric vehicles, battery systems and charging pile systems, which work in coordination with each other. When the three begin to work together, the core of the charging pile (charging pile controller) issues instructions to the charging module of the charging pile. At this time, the charging module starts to work according to the output voltage and output current required by the instructions. Continuously charge the electric vehicle power battery. In the charging process, the BMS and the charging pile controller communicate in real time. When the BMS of the vehicle detects its voltage or current to meet the specified requirements, it will give the core controller of the charging pile a signal, so as to cut off the voltage and meet the needs of charging and discharging.
If you use the smart charger of the battery car, it will automatically power off when it is fully charged.
For the original charger purchased in the early days, it requires human control that is, turn off the power after sufficient power;
Most of the current chargers are intelligent, such as automatically identifying whether the positive and negative terminals are connected incorrectly, automatically adjusting the charging current size, and automatically cutting off power after sufficient electricity, which is extremely convenient to use.