Connect some electrical equipment such as external car phone, portable DVD, mobile phone charger, and install the car electrical equipment.

The external interface of the 12v inverter for vehicle is mostly set in the inner wall of the luggage compartment or under the central console. With the increase of the types of electrical appliances used, sometimes an interface is difficult to meet the use needs. There are two kinds of 12V voltage in the circuit of the main board, which is led out through the power line at the power end, and one is combined with 5V voltage to form 4P or 8P interface for the CPU power supply; An integrated power supply 24P interface on the motherboard is designed for independent graphics card power supply.

Car power supply refers to the animal battery directly from the built-in or generated by the engine, after the rectification filter limited to 12VDC power supply, there is a special socket, because it is the car power supply, use usually need to have a corresponding adapter with electrical appliances, because not all electrical appliances with 12V working voltage, such as mobile phone charging, shaver, etc., Requires a power adapter to lower.

Input AC220 output AV15 transformer voltage through the rectifier bridge rectifier capacitor filter, and then through the regulator 7812 voltage, to get +12V voltage, not isolated, switching power supply to get isolated 12V, the use of +12V and -12V dual power supply, is a typical push-pull power amplifier circuit, the general vehicle is mostly single power supply power amplifier circuit.

Difference between 12v power supply and cigarette lighter

The jack comes in different forms. The electric heating wire of the cigarette lighter can be heated by inserting the 12V power socket, but it cannot be done by inserting the 12V power socket.

Most models, after extinguishing, 12V power socket and cigarette lighter will stop power supply. But some models stop and turn off, the cigarette lighter is always in the state of power. 12V and cigarette lighter voltage is 12V, such as car recorder, car refrigerator, you can plug into any hole can be used.

The owner needs to pay attention to the electricity from the cigarette lighter jack. If the cigarette lighter jack can continue to supply power after the vehicle is powered off, do not use the cigarette lighter jack to supply power to part of the vehicle electrical appliances, otherwise it may run out of battery power. So if the car does not open for a long time, it is best to disconnect the power supply of the car's traffic recorder, so as to protect the car battery. In addition, when in use, if used improperly, it is likely to increase the load of the vehicle circuit, light will burn the fuse, serious, and may even cause spontaneous combustion of the vehicle. 12V120W means: a jack can provide 12v voltage, can drive the maximum 120W appliance. Anything over 120 watts will blow a fuse.