Function introduction:
1. in the past, the general mobile phone charging was the linear charger charging mode. Its input current is equal to the output current. The battery voltage of mobile phone is about 3V to 4V, and the power adapter is 5V output, so when the battery voltage is low, there will be a large power loss problem, which is also one of the most important reasons for the heating of mobile phone during charging. Switching charger charging technology is to reduce the loss, so that the battery charging current is higher than the charger current, improve the charging speed.
2.Quick charge 1.0 technology adopts Switching charger charging mode, which improves the charging current of the battery, improves the charging efficiency, shortens the charging time, and realizes the current output of the charger with a maximum of 1.8A. Secondly, because there are many kinds of chargers and mobile power sources on sale, Quick charge1.0 technology can identify different types of USB power supply, determine the type of power supply and make maximum use of the output current capacity of the power supply.
3.Quick charge 2.0 technology is a charging specification supported to further shorten the charging time of mobile phones. Two schemes are designed in Quick charge 2.0. The first is to support three kinds of voltage of 5V/9V/12V. By increasing the voltage, the second is to support 5 V/ 9 V/12 V/ 20 V to provide more power to the mobile phone battery. Mobile phones can identify and receive higher voltage and current and improve charging efficiency.
Quick charge 3.0 adopts the algorithm of Intelligent Negotiation Optimum voltage. The optimal power transmission can be realized at any time, and the power can be maximized. According to Qualcomm, charging efficiency is 38 per cent higher than that of QC2.0, four times that of ordinary charging technology, and can charge a typical phone from zero to 80 per cent in about 35 minutes. (Quick Charge 2.0 supports four modes of charging at different power levels, namely, 5V/2A, 9V/2A, 12V/1.67A, and 20V four-stage charging voltages. The new Quick Charge 3.0, based on 200mV increments, provides a flexible choice of voltages from 3.6V to 20V to minimize power loss).
4.Quick charge 4 supports dual parallel charging, speed increase by 20%, efficiency increase by 30%, claim to be able to charge 50% in 15 minutes or less, and support USB Type-C, USB PD, optimal voltage intelligent negotiation power management algorithm (INOV), voltage, current and temperature measurement is more accurate, battery. Chargers, data lines and system protection are also in place.
5.Quick charge 4+ improvements include dual power management IC, intelligent thermal balance, advanced safety features, up to 27W charging power, and it’s also compatible with USB PD fast charging protocol.
6.This is the basic implementation of Quick charge charging technology supported by Xiaomi mobile phone and REDMI phone (REDMI 2A uses Switching charge).