The development of smart phones today, eight-core processors, 3GB storage, and 2K screens have become very common. It can be said that the hardware configuration of mobile phones has the qualification to compete with PC computers. However, the development of one accessory is very slow. It is the battery. A few years have only evolved from a lithium battery to a lithium polymer battery. Batteries have become a bottleneck that plagues the further development of smart phones.

　　The development of smart phones today, octa-core processors, 3GB RAM, and 2K screens have become very common. It can be said that the hardware configuration of mobile phones has the qualification to compete with PC computers. However, the development of one accessory is very slow. It is the battery. A few years have only evolved from a lithium battery to a lithium polymer battery. Batteries have become a bottleneck that plagues the further development of smart phones.

　　It is not that mobile phone manufacturers have not noticed the battery problem, but they have been stuck in the battery technology that has been stagnant for many years, and cannot solve the problem from the root of the battery before the emergence of creative new technologies. Most of the mobile phone manufacturers have taken a different approach. Some have made great efforts to increase the size and thickness of the battery to achieve higher capacity; some have opened their minds and introduced solar energy technology into mobile phones; some have vigorously promoted Wireless charging technology; some develop external protective shell batteries and mobile power supplies; some try to add power saving modes at the software level, and so on. But these methods can only be said to be helpless.

　　Fast charging technology is not new

　　Galaxy S6's "fast charging" sounds great, but this is really not a new technology. As early as the era of MP3 players, fast charging technology has appeared and is widely used. The most representative one is Sony. Sony’s MP3 players can be used for 90 minutes after three minutes of fast charging. Fast charging technology was later used by manufacturers on mobile phones. However, as mobile phones are more sophisticated, more attention needs to be paid to charging safety.

　　The current mainstream fast charging technology

　　1, Qualcomm QuickCharge2.0

　　The QuickCharge technology has been developed to version 2.0. Compared with the earlier QuickCharge version 1.0, the new specification increases the charging voltage from 5V to 9V (maximum 12V), and the charging current is increased from 1A to 1.6A (maximum 3A). The current increases the output power by a factor of three. According to Qualcomm official data, QuickCharge2.0 can charge a smartphone with a battery capacity of 3300mAH to 60% within 30 minutes.

　　2, MediaTek PumpExpress

　　MediaTek’s fast charging technology is divided into two specifications, PumpExpress and PumpExpressPlus. The former provides fast DC chargers with an output power of less than 10W (5V), and the latter provides chargers with an output power of more than 15W (up to 12V). The charging voltage of the constant current stage can be continuously adjusted according to the change of the current on the VBUS, and the maximum charging speed is 45% faster than the traditional charger.

　　3, OPPOVOOC flash charge

　　VOOC flash charging technology came out with OPPOFind7. It is different from Qualcomm QC2.0 high voltage and high current mode. It uses a mode that reduces voltage and increases current. A standard 5V charging head can output 4.5A charging current, which is better than normal charging. It's 4 times faster. The principle of realization is mainly to use 8-contact battery and 7pin data interface. Ordinary mobile phones use 4-contact battery and 5pin data interface. The extra 4 contacts and 2 pins serve VOOC. It only takes 30 minutes for Find7 with a 2800mAh battery capacity to recover from 0 to 75%.

　　QC2.0 is easy to popularize and VOOC is more efficient

　　Finally, I will summarize the three fast charging technologies. Because Qualcomm QuickCharge2.0 is integrated in the processor, and Qualcomm processor has a high market share, it is easier to popularize than the other two. At present, there are fewer products using MediaTek PumpExpress, and the cost is lower than Qualcomm. However, stability needs to be verified; the charging speed of VOOC flash charging is the fastest among the three technologies, and the low-voltage mode is safer. The defect is that it is currently only used in its own products. It is said that OPPO will bring the second generation this year. I wonder if the flash charging technology can be improved.