What is the principle of an automotive emergency jump starter?

[Theo]

Automotive emergency jump starters operate on the following principles: 1. When AC power is input, the device uses an automatic transfer switch to start the vehicle while the system controller charges and manages the battery via the charger; 2. If AC power is interrupted or experiences overvoltage, the controller system sends a command to the transfer switch to switch to inverter power supply, utilizing the stored battery power to provide electricity to other devices; 3. When the input AC voltage returns to normal, the controller system instructs the inverter to shut down, and the transfer switch switches back from the inverter to AC power to supply electricity to other devices while simultaneously charging the battery pack.