For safety reasons, when charging, the entire drive system needs to be in a power-off state, that is, the high-voltage contactor of the drive system must be in a disconnected state. When the high-voltage safety management system receives a valid charging information command, the high-voltage management system first detects the drive Whether the system-related contactor is disconnected. If it is in the disconnected state, close the relevant contactor of the charging circuit. Otherwise, the charging contactor will not be closed, and the high-voltage management system will send out an audible and visual alarm to remind relevant personnel until the fault is eliminated.
Design of Residual Electricity Discharge Protection in High Voltage System
There is a large amount of capacitance in high-voltage components such as motor controllers and electric air conditioners in high-voltage systems. When the high-voltage main circuit is disconnected, there is still high voltage and electric energy in the high-voltage system due to the existence of high-voltage component capacitance. In order to avoid harm to people and cars, after the high-voltage system is cut off, the high-voltage electricity of the capacitor should be released through the resistor connected in parallel in the high-voltage system.