QC1.0: voltage and current raised to 5V2A, charging time by 40%
The times continue to move forward, large-screen smart phones began to break out, battery life can not keep up, fast filling manufacturers to enhance the user experience one of the magic, so QC2.0 was born.
QC2.0: compared to the old standard, QC2.0 epoch changed the charging voltage, from the years to maintain the conventional 5V to 9V / 12V / 20V, and QC1.0 to maintain the same 2A current to achieve a large 18W Power power transmission, and the wire does not require special treatment of old wire can be universal.
Increase the voltage, power is up, the efficiency has declined. The voltage for each increase in the file, the efficiency of about 10% decline, most of these energy into heat, so almost no use of 20V voltage file, and only retained the 5V, 9V, 12V three files. Even if it is not hot, Qualcomm also feel 5V to 9V step is too big, a little pull the eggs, so you can constantly adjust the unit to 0.2V until you find the most appropriate voltage, how much voltage the most appropriate? Qualcomm has its own unique Of the voltage intelligent negotiation (INOV) algorithm, which is QC3.0.
QC3.0: QC2.0 9V / 12V two-step voltage on the basis of further subdivision voltage file, using a unique INOV algorithm to 200mV for a file set the voltage, the lowest test down to 3.6V maximum voltage of 20V, and Down compatible with QC2.0. As a result of the full use of the Type-c interface to replace the original MicroUSB interface, the maximum current is also raised to 3A, because the voltage is lower so the efficiency of up to 38%, 27% increase in charging speed, heat 45%.
QC4.0: Increase power again to 28W and join USB PD support. Cancel the 12V voltage file, 5V maximum output 5.6A, 9V maximum output 3A, and the voltage file to continue to subdivision to 20mV for a file.