Nowadays, the number of cars is increasing. Each car is equipped with many devices, such as car vacuum cleaners, driving recorders, and mobile phones. Therefore, too many devices will cause the power supply interface to be insufficient. Therefore, a car fast charger is very dominant, with an additional multi-port design, a charger with multiple functions to meet the needs of multi-device simultaneous charging. Typically, automotive quick chargers are designed with multiple safety shields to carry multiple devices simultaneously.