How many kinds of mobile phone charging interfaces are there?

At present, there are three main interfaces for mobile phone chargers: Micro USB interface; USB？ Class c interface; Lightning interface.

1, Micro USB interface: This interface is a portable version of USB 2.0 standard, which can only be plugged on one side, supports OTG function and is compatible with USB 1. 1 and USB 2.0.

2、USB？ Class c interface: USB? Class c interface is a USB 3. 1 standard connection interface, which has the characteristics of both forward and backward insertion and high transmission speed.

3.Lightning interface: This interface is a high-speed multifunctional I/O interface designed by Apple. Starting from the iPhone 5, new iPhones and iPad are equipped with this data interface. There are 8 contacts on both sides of the Lightning interface, which also has the characteristics of both forward and reverse insertion, and can transmit specific signals required by accessories according to different accessories.

Extended data:

USB？ Main functions of C-type interface

1, come on

Theoretically, the highest transmission rate of USB-C port is 10Gb per second. However, Apple said that the USB-C port of the new MacBook has a maximum transmission rate of 5Gbps. The maximum output voltage is 20 volts, which can speed up the charging. The USB-A model has a limit transmission rate of 5Gbps and an output voltage of 5 volts.

Step 2 be a generalist

The USB-C port of the new MacBook can transmit data and charge, and can also be used as a video output port to connect external display devices. The only question is how Apple can satisfy users who want to do these three things at the same time.

3, two-way

Unlike the old USB port, which can only transmit power in one direction, the power transmission of USB-C port is bidirectional, which means it can transmit power in two ways. Therefore, users can not only charge mobile devices with notebooks, but also charge notebooks with other devices or mobile power sources.

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