In November 2016, Qualcomm released its QC4 fast charge technology (Quick Charge 4, no longer named after the original 2.0/3.0) ， The most common specification of QC1.0 is 5V2A charging on current low-end computers; The most common high voltage route of QC2.0 is 9V and 12V, and the power is generally around 15-20W; QC3.0 focuses on improving the charging efficiency. INOV technology can provide 200mV step voltage adjustment gradient, which can reduce the heating of mobile phones while improving the speed.
For QC4 fast charging, 5V/4.7A~5.6A and 9V/3A are used (12V is discarded). At the same time, the step voltage accuracy of INOV technology is improved to 10mV, further improving the charging efficiency and reducing heat. It claims to be able to charge 50% of the mobile phone with 2750mAh battery in 15 minutes. The improvement of QC4 is mainly in the following aspects:
Support USB Type-C USB PD， It has stronger compatibility.
More advanced technology has been added to the power saver to extend the service life of the battery and improve the safety of charging.
The INOV algorithm maximizes the charging efficiency, optimizes the charging process, and reduces heating.
The second power management chip is used to provide dual fast charging, combined with intelligent thermal balance design to optimize charging efficiency.
QC4 uses the latest power management chips SMB1380 and SMB1381, which have lower impedance and higher peak efficiency of 96%. It has higher charging efficiency and can be used in batteries less than 0.8mm thick, providing perfect support for thin and light fast charging devices. These two chips have been launched before the end of 2016.
Qualcomm's highly touted QC4 fast charger should have appeared on the Snapdragon 835, but the current Samsung Galaxy S8/S8+, Sony XZ Premium, Xiaomi 6 and other Snapdragon 835 models have failed to catch up. On May 24, Nubia's official spoiler, with the slogan of "4" together in the poster, will be released on June 1. Nubia Z17 is likely to carry Qualcomm's QC4 fast charger. If it is true, Z17 is the first mobile phone on the earth to use QC4. However, Qualcomm initially announced that it would be put into use on mobile phones in the first half of 2017, but it still skipped the ticket for one day
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