Car chargers are often used to supply power to car batteries (car 12V, truck 24V), and are widely used in the field of lithium battery charging for various portable and handheld devices, but the harsh environment of car batteries (transient peak voltage, system switching noise interference, EMI, etc.) should also be considered. ), so the power management IC selected by the automobile charging scheme must meet the requirements at the same time, with high voltage resistance, high efficiency, high reliability and low frequency (conducive to EMI design).
Car charger is an accessory that is convenient for car owners to charge digital products anytime and anywhere with on-board power supply. Some high-end car chargers generally have two USB ports, which can charge two digital products at the same time. These products generally have overload protection, short-circuit protection, high-voltage input protection, high-temperature protection and four-fold safety protection functions to ensure safe use. The car charger can be used at home or in the car, realizing the multifunctional purpose of car charging, direct charging and USB charging.
The principle of car charging is to charge the mobile phone after reducing the voltage of 12 volts to 5 volts. Due to the price limit of the charger, there are many defects in the circuit, and the protection function of the circuit is almost absent. If the step-down and current-limiting circuit fails, 12 volts will directly enter the mobile phone, and the mobile phone will die.
It is safe and good for mobile phone battery to raise it to 220 volts with car inverter and then charge it with original charger. Where the car charger is plugged into the car, the output voltage is DC point, which is between 12V and 24V. If the quality of the car charger is not very bad, it will not affect the charging of the mobile phone, but it is recommended not to use it often.