Fast charging technology is changing with each passing day. Today, Qualcomm QC Fast Charge still dominates the market. Now QC fast charge has been developed to the fourth generation, each generation has revolutionary progress. From QC1.0 to QC4.0, the replacement time is short, and the masses of people will inevitably complain.
"Hey? Laozi QC3.0 is useless, QC4.0 is out? Gaotong Dad is mighty."
It is precisely because Qualcomm's old driver stepped on the gas pedal to ride the dust, the product's iteration speed can not keep up, so that the products equipped with QC1.0, QC2.0, QC3.0 technology are also circulating in the market. For example, the new version of the RMB issuance, the old version of the RMB is still in circulation, and it is still understandable. Anyone who uses Kangxi Tongbao can’t say it! So what is the big change in QC1.0 to QC4.0? Let’s make a comparison.
In the NOKIA era, a 800mAh battery is not a problem for two or three days, so the charger with 5V0.5A is completely enough, and it can be filled in two or three hours. If it is Nokia's ruled planet, there is no QC fast charge. It’s a thing.
After 2010, the large-screen smart phone represented by Android became popular. The battery capacity has increased several times. 2000mAh has become the standard (currently the highest has broken 6000mAh). If it is still 5V0.5A charging, it is "charged for two hours, call 5 minutes", so the charging power must be increased. How much to improve? Let's get a 5V1A first. But still not enough, USB-IF stood out and said: "Try 5V1.5A." Still small, this time Qualcomm spoke: "We have to go 5V2A." So QC1.0 came out.
QC1.0: The voltage and current are increased to 5V2A, and the charging time is shortened by 40%.
The era continues to move forward, large-screen smart phones begin to erupt, battery life can not keep up, fast charge has become one of the magic weapon for manufacturers to enhance user experience, so QC2.0 was born.
QC2.0: Compared to the old standard, QC2.0 has changed the charging voltage epoch-making, from the conventional 5V that has been maintained for many years to 9V/12V/20V, and the same 2A current with QC1.0 to achieve 18W. Power power transmission, and the wire can be used universally without special treatment of old wire materials.
When the voltage is increased, the power is up, and the efficiency is reduced. For every second increase in voltage, the efficiency is reduced by about 10%. Most of this energy is converted into heat, so the 20V voltage file is almost useless, leaving only 5V, 9V, and 12V. Even if it is still hot, Qualcomm thinks that the 5V to 9V step is too big, and it is a bit of an egg, so it can be adjusted continuously in 0.2V until the most suitable voltage is found. How much voltage is most suitable? Qualcomm has its own unique The Voltage Intelligent Negotiation (INOV) algorithm, which is QC3.0.
QC3.0: Based on the QC2.0 9V/12V two-speed voltage, further subdivide the voltage file, adopt the unique INOV algorithm, set the voltage with 200mV as the first gear, and the lowest can be down to the maximum voltage of 3.6V 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 increased to 3A, because the lower voltage, the efficiency is up to 38%, the charging speed is increased by 27%, and the heat is reduced by 45%.
QC3.0 is good, but Google does not agree with it. If you use Qualcomm alone, you must use the USB PD protocol, the arm can not be twisted, the Qualcomm soft, and QC4.0.
QC4.0: Increase power to 28W again and add USB PD support. The 12V voltage file is 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.
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