More than ten years, the iPhone’s charging changes

1, charging interface

        
The first-generation iPhone released in 2007 used the 30pin interface. It was not until the iPhone 5 was released in 2012 that the iPhone 4 30-pin interface was replaced with the Lightning interface. The 30pin interface carries functions such as data transmission, power transmission, firewire, control, and line-level audio output. The disadvantage is that it takes up too much space, so the 30pin interface does not meet the development needs of the iPhone, so there is a new generation of Lightning interface. The number of pins on the Lightning interface has been reduced to 8 pins, which is several times smaller than the original, but still retains the functions of data transmission, charging, control and audio output. Obviously, the Lightning interface is more efficient than the 30pin interface.

2, charging cable

        
From the iPhone 2G to the iPhone 4S, Apple uses a USB-A to 30-pin charging cable. The Lightning interface was launched at the iPhone 5 conference. Each generation of iPhones, including the iPhone 5, comes standard with a USB-to-Lightning cable. The Lightning interface has 8 pins on both sides.

3, the battery

        
Before the release of the iPhone 4, the mobile phone was generally replaced with a replaceable battery. Go out with two batteries, and replace them when there is no electricity. After the release of the iPhone 4, many mobile phone brands followed Apple, using a non-replaceable battery design. We all know that the battery is a consumable. As the number of cycles increases, the capacity gradually decreases, which has also spawned a new industry – the charging treasure industry.

4, charging agreement

        
Since the iPhone battery capacity has been small, Android phones do not have fast charging technology. With the release of iPhone6Plus, the battery capacity of mobile phones has almost doubled. At this time, Android manufacturers already have 18W or even 20W fast charge such as QC2.0, and the charging power of iPhone 5W is too slow.
        
Last year, three new iPhones were released. Apple added the USB PD fast charging protocol based on the Apple2.4A fast charging protocol. USB Power Delivery (USB PD) is a fast charging protocol commonly used on mobile phones, tablets, notebooks, and game consoles. This specification enables higher voltage and current. The advantage of using USB PD is to increase the versatility of power adapters for electronic devices such as notebooks, mobile phones, tablets, and game consoles. In addition, devices using the USB PD charging protocol can be charged to each other.

5, wireless charging

        
Last year was Apple’s first wireless charging technology on the iPhone. Since the Japanese carrier NTT Docomo and Sharp introduced the world’s first wireless charging smartphone, the AQUOS phone f SH-13C, in 2011, wireless charging has not been popular on mobile phones. Apple is equipped with the Qi standard 7.5W fixed-frequency voltage regulation wireless fast charge and compatible with 5W on the iPhone, which is indeed the best solution at the moment.