Automotive emergency jump starters are designed to provide a short burst of power to ignite the engine when the vehicle’s battery is depleted or malfunctioning. Due to the frequent occurrence of low battery issues in many vehicles, the domestic automotive emergency jump starter industry has experienced rapid growth. The following will explain how these devices work.
The core function of a car jump starter lies in its inverter system, which is responsible for discharging, charging, and energy storage. Designed for portability and ease of use, these units typically feature PVC or ABS casings and employ high-rate polymer model aircraft cells. A digital LED screen displays the remaining power. They can be recharged via car chargers or household power adapters and are equipped with built-in protections such as anti-reverse charging and over-charge prevention to safeguard the circuits. A white button controls the lighting modes—steady light, strobe, and SOS emergency light.
Working Principle of Automotive Emergency Starting Power Supply
- When AC power is input, an automatic transfer switch (self-actuating and self-resetting mutual transfer device) directs electricity to start the vehicle. Simultaneously, the system controller manages the charging process via a built-in charger. Typically, the charger’s capacity is about one-tenth of the power supply’s total capacity, serving as a supplementary source rather than providing the inverter’s output current. Under the controller’s management, the inverter remains inactive, and AC power is supplied through the transfer switch to the vehicle or other electronic devices for charging .
- If AC power is interrupted or experiences abnormal voltage, the controller signals the transfer switch to change to inverter mode. The system then draws stored energy from the battery to supply power to external devices .
- Once AC voltage returns to normal, the controller switches the inverter off and reactivates the AC bypass via the transfer switch. This allows the system to provide AC power for charging other products while also replenishing the battery pack .
- A car battery typically operates between 9V and 16V. When the engine is running, the battery voltage is around 14V, and when the engine is off, it rests at approximately 12V .