USB car charger: usually referred to as USB car charger. It takes advantage of the versatility of USB to be widely applied to various charging interfaces. Then combine the 12V DC and 24V DC to USB and the common DC 5V voltage of each charging appliance. This makes it possible to use the standard power supply on the car and the USB interface to charge the DC 5V appliances. Such as: mobile phones, MP3, navigators, game machines and all other 5V DC appliances.
Car Charger Working principle
First of all: USB car charging must comply with a principle. For the battery charging of small consumer electronic devices, the USB port is an economical and practical power source. To fully comply with the USB 2 specification, the load connected to the USB port must be capable of two-way communication with the host. The load must also meet the power management requirements, including low power mode, and facilitate the host to determine when to draw large current from the port. Although some compatible systems can adapt to most USB hosts, sometimes unexpected results occur. Only with a good understanding of USB specification requirements and load expectations can we achieve a good balance between specification compatibility and load complexity.
Therefore, USB car chargers, from interface conversion to voltage conversion, and current power requirements match the needs of electrical appliances. Sometimes you will encounter the USB you bought and cannot charge your appliance, so there may be a matching problem. For example, whether the electrical voltage you use is USB DC 5V voltage. If the voltage is correct, that is, your electrical power may be larger. USB car charging power may not match, there may be no charge, or insufficient electricity. At this point, it is necessary to confirm whether the charging current is large or small.
USB is based on the above factors: it first turns the power supply DC 12V or DC 24V into DC 5V in the car, and then transfers the output of DC 5V to the corresponding electrical appliance with the unified interface of USB. Based on the different electrical power, the power of USB car charger is different, which is different from that of USB.
USB car charger specification
USB car is filled with common specifications: output: 5V DC 500mA; 5V DC 700mA; 5V DC 1000mA; 5V DC; it can be found that the current has a variety of specifications after understanding the voltage of its specification output. The different current specifications are easy to use and choose to be applied to different electrical appliances. Such as: the previous mobile phone is basically 500mA current; but with the development of the times, mobile phone, game mobile phone, music, Internet mobile phone and so on, its power is big. So the charger needs a relatively large current. The different specifications of the dual USB car charger allow users to choose the appropriate matching specifications.