BLOGS
2019-01-31
As smartphone screens get bigger, resolution gets higher and performance gets better, battery life has become a common complaint. In the absence of a major breakthrough in battery technology, rapid charging technology naturally became the savior.
Many people don't know much about quickcharge, and it's easy to misunderstand the technology. For example quick charge after all install not safety? Can damage cell phone battery etc. Now let's talk about those things.
First of all, we need to understand the charge and discharge principle of lithium ion battery, battery has two poles: the positive electrode is lithium compound, the negative electrode is graphite. Charge and discharge are electrical energy and chemical energy conversion, in the process of lithium ions in the positive and negative polar movement, but also into different compounds.
Rapid charging is a relatively general concept, which can be realized in three different forms:
But to truly charge your phone quickly, you need to do more than just boost the voltage and current. Quick charging technology requires a complete set of customized circuits, cells, interfaces, data lines and supporting fast charging adapters. At the same time, you also need to make a smart power management system, so that the mobile phone can be charged according to different circumstances, to provide safe and intelligent charging protection.
At present, there are basically three types of rapid charging technologies:
1. OPPO's VOOC flash charge for quick charging;
2. Qualcomm Quick Charge
3. Mediatek Pump Express Plus for quick charging
Qualcomm Quick Charge
At present, qualcomm Quick Charge technology has unknowingly come to the fourth generation of Quick Charge 4. From the initial QC 1.0, which only supports the highest charging power of 5V/2A, to QC 2.0, which can be compatible with the four-level charging voltage of 5V/9V/12V/20V, and reach the level of the maximum 3A charging current. While Quick Charge 3.0 is an improvement on the basis of QC 2.0. It takes 200mV increment as a first gear and supports dynamic regulation of working voltage from 3.6v to 20V. In this way, handset manufacturers can adjust the optimal voltage according to their own product demand, so as to achieve the expected current and improve the charging efficiency of mobile phones.
The upgraded QC 4.0 can enjoy up to 20% improvement in charging speed compared with the previous generation QC 3.0 through Qualcomm Technologies' Dual Charge technology. In addition to improving charging speed, QC 4.0 enables shorter charging times and higher efficiency, protecting batteries, systems, cables and connectors while measuring voltage, current and temperature more accurately. On the one hand to improve the charging speed, on the other hand to protect the battery, charger and other equipment.
Next, we will take a look at the OPPO VOOC flash charging technology with low voltage and high current. VOOC chooses to keep the voltage unchanged and improve the charging speed by increasing the current. Looking back on the two years of OPPO VOOC flash charging, it was first born in 2014, and then launched the VOOC mini in October of the same year. The number of users in the past 15 years has exceeded 10 million, which has been recognized by people in and outside the industry. At the beginning of last year, OPPO launched the super flash charging technology, which is even faster than the charging speed of OPPO VOOC flash charging.
Before learning about the super flash charging technology, first get familiar with the three stages of mobile phone battery charging, namely constant current pre-charging, high current constant current charging and constant voltage charging. When the mobile phone is in low power, the voltage will be reduced accordingly. At this time, the charger will use a lower current to charge the battery. When the battery voltage is higher than the preset value, constant current charging will be adopted.
OPPO's latest flash charging technology makes use of such a working principle to strictly control the current. Such an advantage is that it avoids the way of boosting the power by supercharging, so the circuit loss will be reduced a lot, and the phenomenon of mobile phone heating will be effectively contained. After experiencing the potential trouble that the first generation of VOOC fast charging appliances are huge and the charging line interface will break, the fast charging technology that combines fast charging, portability and safety is finally presented to us. However, this technology is only suitable for OPPO, and its compatibility is not enough.
In addition to qualcomm and OPPO, two prominent Quick charging technologies, mediatek's MTP Pump Express Plus Quick charging technology is similar to qualcomm's Quick Charge technology in principle. Both of them ensure a constant current and achieve greater charging power by increasing the voltage of the charger to the USB port of the phone.
We found that in the past two years PumpExpress technology emergence, built-in PMIC power management IC, allow the initial voltage needed for the charger according to the current decision. PMIC sends out pulse current instruction to the charger via USB Vbus, and then adjusts the output voltage according to this instruction.
At present, the latest Pump 3.0 claimed to be able to Express in 20 minutes for smartphones with 70% power, at the same time than PumpExpress Plus power consumption reduced by 50%, indirectly reduce the fever. Compared with the QC 3.0 200 mv for an incremental approach, PumpExpress 3.0 voltage tuning range is only 10 mv, theory can provide 5 a charging current.
In addition, the oneplus DASH flash charger is similar to the OPPO VOOC flash charging technology. The original charger can output 5V/4A power. For another example, meizu's mCharge 3.0 is based on mediatek platform, so mCharge quick charge technology is also based on Pump Express launched by MTK.
Many consumers have a misconception about fast charging technology. They always think mediatek SoC is equipped with MTK fast charging technology, while Qualcomm snapdragon SoC is equipped with QC fast charging technology. In fact, it is not certain that fast charging technology chips and circuits can also be purchased separately. The most classic example is meizu PRO 5, which adopts Exynos platform but integrates MTK PEP fast charging scheme instead of samsung AFC standard. Similarly, many vivo models using MTK platform still support the twin-engine flash charging technology based on QC 2.0 standard.
Samsung's flagship phone, on the other hand, comes with its own AFC quick charge standard and is compatible with QC 2.0. The QC quick charging technology is not supported by samsung C5 and samsung C7. Samsung's own quick charging head must be used for quick charging. Samsung Galaxy Note7 also supports QC, PD and AFC standards.
Based on this principle, it is not difficult for us to understand the dual-protocol fast charging scheme. As long as the mobile phone manufacturers are willing to pay, they can get solutions from different fast charging providers, not to mention integrating two fast charging schemes. In theory, it is also possible.
At present, each quick charge or has the technical safeguard. Because power management module in a set of quick charge scheme already preset phone batteries are the highest voltage, current, temperature and other security protection mechanism, including the temperature protection, short circuit protection, over discharge protection, over current protection, over voltage protection and so on many protection technology, precise, quick charge technology is safe.
In principle, battery damage comes from two sources:
On the one hand, when the battery is charged and discharged, the cathode and anode of the battery will shrink and expand with the release and absorption of ions. If the battery is charged quickly for a long time, the chemical substances on the battery will be destroyed, resulting in shortened battery life.
On the other hand, due to the high current, the thermal effect of the current will be intensified during the quick charging, which will lead to the high temperature of the battery, and the high temperature will lead to the sharp decrease of capacity and permanent damage of the cell.
In fact, the normal charging state actually causes a little damage to the battery, but the damage is so small that it takes up to a year or more to show up on the phone. Therefore, both quick charging and ordinary charging will actually cause irreversible damage to the battery, but the damage of quick charging is slightly stronger than that of ordinary charging. However, this kind of battery damage is still in a safe and reasonable state under the various guarantees of the current quick charging technology.
Therefore, the current rapid charging technology is reliable and stable. Sopower USES the most advanced quick charging technology to enrich the phone charging cabinet so that you can quickly get your full phone back.