Three steps to check whether the mobile phone charger supports fast charging:
1. The mobile phone supports charging power supply and fast charging protocol.
2. See if the mobile phone charger supports the charging protocol of the mobile phone.
3. Data line current size and interface
For example, choose Xiaomi 65w gallium nitride charger and Redmi K40 mobile phone.
Step 1: The charging power supported by Redmi K40 mobile phone is 33W, and the charging protocols are QC3.0 and PD3.0, as well as Xiaomi's own private protocol.
Step 2: The fixed gear of Xiaomi 65w GaN charger charging protocol is 5V=3A, 9V=3A, 10V=5A, 12V=3A, 15V=3A, 20V=3.25A, and the maximum is 65w.
At the same time support 5- 1 1V=3A and 5-20v = 3.2a.. Support QC3.0 and PD3.0, as well as Xiaomi private protocol.
Step 3: The maximum current supported by the data line is 5A, and the data interface is USB-C to USB-C interface.
At this time, because Xiaomi charger has its own private charging protocol, the maximum output power of Redmi K40 mobile phone charged with Xiaomi 65w charger is 33W.
The actual performance will be affected by the resistance, 33w is only the peak value, and the actual situation will be slightly smaller. If it is not the original factory, it generally does not support private protocol charging, and it will laugh at 20w.