Charging technology of polymer lithium batteryThe current at the time of charging is not always constant. When your phone is in low power, the phone will ask the charger to make a full-speed work to make up, which is the so-called peak. At this time, the fireproof circuit of the charger and mobile phone opens all over, the charging speed is very fast, but the loss and fever are also large.
When it is generally rushed to 60% to 80%, according to the different manufacturers set, the phone will send signal to the charger to reduce current to achieve the protection of the battery, reduce loss, reduce fever, etc., in this stage, charging power It is greatly reduced, which is the trickle that we often say.
Again, charging current is controlled in his mobile phone, there is no cooked relationship with the charger, and the charger can only adapt to the needs of the mobile phone. There is no so-called charger power over the same voltage under the same voltage. Of course, if you die, use the charger of the charger with only 9V voltage to charge the voltage 5V mobile phone, will certainly do things.
However, how can Qualcomm will make good health to promote everyone? Quick Charge 2.0 is a so-called identification process, you can't find it back to 5V, slowly charge it.
Moreover, Qualcomm is very strong for hardware, supporting the product of Quick Charge 2.0 needs to pass certification; Qualcomm authorization to the UL laboratory to do (MTK fast charge certification is also 1,500 US dollars, about 10,000 yuan per year , Certification cycle 2-6 weeks. At the same time, it will also use the high-pass SMB chip to use Qualcomm's SMB chip (the mobile phone is not used, the mobile power will make you use SMB).
So everyone has been inspired, and they have begun to do their own private identification agreements. For example, the Pump Express Plus of MTK, Huawei's Identification Agreement I do in Glory 7. However, the basic principles of these goods are the same, that is, starting from 5V, then charge the charger and mobile phone to each other, increasing the voltage of the charger to the mobile phone USB port in the case of current high 2A.
There is also a lot of vests, such as Samsung Fastcharge, the rapid charging of ASUS mobile phones, in fact, is the vest of Quick Charge 2.0; and the Meizu Mcharge is the vest of Mtk Pump Express Plus.
However, it is said that Samsung starts from Note 4 and has its own identification agreement, first detecting its own reconciliation Quick Charge2.0, so it does not pick up charge for Samsung mobile phone, as long as Quick Charge 2.0 is in line.
However, Huawei and the Meizu used MTK PE will not work, you must match your own dedicated charger; more funny is that their charger is supported by Quickcharge 2.0, you can achieve 9V fast charge to Samsung or Xiaomi. This is because the QC certified Qualcomm tube of the charger is not very strict, I want to do it, as long as you don't propagate, don't play Quick Charge 2.0 logo.
However, the specific principles of these fast charge technologies are similar: Charger communicating with mobile phones, using 5V voltage normally charged; if the mobile phone supports the fast charging protocol, the phone will communicate with the charger; charger receives correct After the signal, the 9V voltage is output. (The process is shown in the following figure, using MX 5) The difference is that Quick Charge 2.0 and Huawei's private protocol are identified by loading the voltage on both lines (D + D-) in the middle of the Micro USB interface, and recognizes correctly 9V; Moreover, the practical MTK PEP technology such as a Meizu is to identify by current fluctuations.
Relatively, MTK's technology is reduced, as QC 2.0's identification requires data lines must be able to transmit data, if the wire missing transmission data D + D- can only be 5V; but MTK PEP technology There is no pressure, because it is current fluctuations to identify, as long as your line can energize, I can identify it.
Chen Qi Decorates the transfer of the central environmental inspector group to transfer the proceedings to fully rectify the full rectification of the parts, all the rectification of the Party Committee, the party committee secretary of the autonomous region, the first secretary of the Party Committee of Xinjiang Production and Construction Corps, A political commissar Chen nation has made an instruction from the three-piece transformation issues handed over to the Central Environmental Protection Inspection Team of Bai Bird Lake Sewage, Cazi Bay Village Self-Building House, and other central environmental protection inspectors and other central environmental protection inspectors, and personally supervise the problem rectification. Chen's nationality pointed out that all departments at all levels in the district and the Corps should conscientiously implement the important instructions of General Secretary General Secretary, and the issues of transferred to the Central Environmental Protection Insugation Group should be highly valued. Change, comprehensive rectification, make sure the parts are falling, all rectify in place.
As for the Nature of Quick Charge 3.0, the flexibility is enhanced on the basis of Quick Charge 2.0, with a 200mV increment, providing flexible selection from 3.6V to 20V voltage.
The translation adult is: QC 3.0 In fact, the total power and implementation are nothing to distinguish between QC 2.0, but QC 2.0 everyone is usually 9V, until the close of Liele P1 is around 12V 2A; and 3.0 directly put the high standard of mobile phones directly At 12V (note 12v is mobile phone, 20V is prepared for tablet, notebook), do not "help increase the fast charging speed up to 27% compared to Quick Charge 2.0".
At the same time, Qualcomm "actively learned" the advanced experience of MTK PEP, evolving from the previously extensive power supply to 200MV's fine management, and improved the charging efficiency reduced the loss of loss Blablabla, "compared with Quick Charge 2.0, reducing power loss up to 45 %. All in all, MTK leads Qualcomm for 1 year ~~
When you see you, you will know that now the fast-charged threshold is not technically, but the big manufacturer runs these messy mutual uncommon-scoring identification agreements, which is the helplessness of capitalism during the development of the science and technology. . Of course, it is not a recognition agreement with a big uncle. The USB promotion team has developed a USB PD charging protocol, a full name "USB Power DeliverySpecification" early in July 2012.
USBPD sets 10W, 18W, 36W, 60W, 100W five specifications according to the supplied electric power. The PD technology is not only charge power, but it is better to achieve two-way charging, which means that the two computers can charge each other, and I don't know where to come. "
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