QC1.0 TO QC4.0 development

• QC1.0: The voltage and current are increased to 5V2A, and the charging time is shortened by 40%

• The era continued to advance, large-screen smartphones began to explode, and battery using time could not keep up. Fast charging became one of the magic weapons for manufacturers to improve user experience, and QC2.0 was born.

QC2.0: Compared with the old standard, QC2.0 has epoch-makingly changed the charging voltage from the conventional 5V that has been maintained for many years to 9V/12V/20V, and achieves 18W at the same 2A current as QC1.0. Power transmission, and the wire does not need special treatment, old QC1.0 wire also can be used universally.

• Increase the voltage, the power will go up, but the efficiency will drop. Every time the voltage is increased by one level, the efficiency drops by about 10%. Most of this energy is converted into heat, so almost no one uses the 20V voltage level, using only the 5V, 9V, and 12V levels. Even so, it’s still too hot. Qualcomm feels that the 5V to 9V step is too big and it’s a bit of a drag, so it can be adjusted in units of 0.2V until the most suitable voltage is found. What is the most suitable voltage? Qualcomm has its own uniqueness. The voltage intelligent negotiation (INOV) algorithm, which is QC3.0.

QC3.0: On the basis of QC2.0 9V/12V voltage, the voltage range is further subdivided, and the unique INOV algorithm is adopted. The voltage is set at 200mV. The minimum voltage can be down to 3.6V and the maximum voltage is 20V. Backward compatible with QC2.0. Due to the full use of the Type-c interface to replace the original MicroUSB interface, the maximum current has also been increased to 3A. Because the voltage is lower, the efficiency is increased by up to 38%, the charging speed is increased by 27%, and the heat generation is reduced by 45%.

• QC3.0 is good, but Google disagrees. How can you Qualcomm build a set alone? If you use my system, you must use the USB PD protocol for me. Arms can’t twist thighs. Qualcomm launched QC4.0.

QC4.0: Increase the power to 28W again, and add USB PD support. The 12V voltage file has been cancelled. The maximum output of 5V is 5.6A, the maximum output of 9V is 3A, and the voltage file continues to be subdivided into 20mV.