The principle is: convert the 12V voltage of the car cigarette lighter socket into 5V USB voltage and charge the electronic product through the charging line.
Generally speaking, the car charger is to convert the direct current of 12V-36V (car 12-24V, truck 36V) into 5V direct current for charging the car mobile equipment. At present, most of the car charger on the market is a narrow voltage (12-24V), like the voltage of large trucks is 36V, more than the 24V of ordinary cars, if you use the ordinary car charger will be hot, easy to burn the charger and mobile phone, like Pinsheng car charger (12-24V), but the use of large trucks (36V) will not work. That's why the voltage configuration isn't wide enough.
Later, after using the 36V safety car charger, it has not been broken. No heat, fast charging and safe.
It is safer to specialized in making a wide voltage car charger, like the earliest car charger brand of wide voltage (12-36V) in China, my BMW car is suitable for my friend's big truck is also applicable. In the past, my friend broke several car chargers and burned out a mobile phone, just because he did not buy a wide voltage car charger.
1, the working principle of the charger: First of all, the AC220 voltage is converted to the DC voltage of about 300V through the fuse, NTC and EMI filter rectification filter, and the initial working voltage is provided to 3842(7-pin) through the starting resistance, which drives the MOS tube switch action, and the switching transformer is in the MOS tube
Under the action of the switch, it will be continuously stored. Release, and make the output winding induced by the electrical energy through the rectifier filter output of the DC voltage, by sampling to 431 or op-amp control optocoupler feedback signal to
Pin 1 or pin 2 of the 3842 controls the duty cycle of the output (pin 6) of the 3842 to achieve a stable output voltage value.
2, there are many types of chargers, such as lead-acid battery charger, valve-controlled sealed lead-acid battery testing and monitoring, nickel-cadmium battery charger, nickel-metal hydride battery charger, lithium-ion battery charger, portable electronic device lithium-ion battery charger, lithium-ion battery protection circuit charger, electric vehicle battery charger, car charger, etc.