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Fast charging technology is changing with each passing day. Today, when hundreds of players in the fast charging market are contending, Qualcomm qc fast charging still dominates the market. Now Qc fast charge has developed to the fourth generation, and each generation has revolutionary progress. The short period of time from QC1.0 to QC4. 0 update has inevitably caused the people to complain.
It is precisely because Qualcomm is stepping on the accelerator, the product iteration speed is completely unable to keep up, making products equipped with QC1.0, QC2.0, and QCs. 0 technologies circulate in the market at the same time. So what is the big change from QC1.0 to QC4.0, let’s make a comparison below.
In the era of NOKIA, a 800mAh battery is not a problem for Work two or three days, so it is completely enough with a 5V 0.5A charger, and it can be fully charged in two or three hours. If Nokia is ruling the planet, there will be no Qc fast charge.
After 2010, large-screen smartphones represented by Android have become popular. The battery capacity has doubled several times. 2000mAh has become the standard (currently the highest has broken 6000mAh). If it is still charged with 5V 0.5A, it will be “charge for two hours. “5 minutes of talk”, so the charging power must be increased.
How much to improve? We first take a 5V 1A. But this is not enough. USB-IF came out and said: “Try 5V 1.5A.” It’s still small. At this time, Qualcomm said: “We want 5V2A.” So QC1.0 came out.
QC1.0: The voltage and current are increased to 5V 2A, and the charging time is shortened by 40%.
The era continues to advance, large-screen smart phones begin to explode, battery life can not keep up, fast charging has become one of the magic weapons for manufacturers to improve user experience, so QC2.0 was born.
QC 2.0 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 184 high power . at the same 2A current as QC 1.0 Power transmission, and the wire does not require special treatment, and the old wire 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, leaving only the 5V, 9V, and 12V levels. Even so, it’s still hot. Qualcomm feels that the 5V to 9V step is too big, so it can continuously adjust in units of 0.2V until the most suitable voltage is found. What voltage is the most suitable? Qualcomm has its own unique voltage intelligent negotiation ( INOV) algorithm, this is QC3.0.
On the basis of QC2.0 9V/12V voltage, QC3.0 further subdivides the voltage range, adopts a unique INOv algorithm, sets the voltage with 200mV as the first gear, and can drop down to 3.6V and the highest voltage is 20V, and 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 do a set of Qualcomm alone? If you use my system, you have to use the USB PD protocol for me. So, Qualcomm has launched QC4.0.
QC4.0 increased the power to 28W again, and added USB PD support. The 12V voltage file is cancelled, 5v can output up to 5. 6A, 9v can output up to 3A, and the voltage file continues to be subdivided to 20mV.
