The development of fast charging technology can be said to be relatively mature today. Today, when battery technology fails to achieve breakthrough results, fast charging technology can be said to be the best and most reasonable endurance solution. But fast charging is not as simple as it seems on the surface, so the next small series will discuss the fast charging technology with the reader.
Charging for 5 minutes, talking for 2 hours, when we are brainwashed by this advertisement, there is actually OPPO's VOOC flash charge as a hard power. At present, the OPPO mainstream smart phones are equipped with flash charging technology, and Qualcomm's own Quick Charge has a tendency to resist. However, since VOOC is not compatible with other mobile phones, VOOC is still a bit strange to users who have not used OPPO flash phones. This issue of technical installment also reveals VOOC flash charging behind "Charging for 5 minutes, talking for 2 hours" Technical support.
What is VOOC flash charging:
VOOC flash charging is an 18-patent low-voltage fast charging technology developed by OPPO. It uses a low-voltage, high-current mode to ensure the charging speed while reducing the heat of the adapter and the phone when charging the phone. At present, mobile phones supporting VOOC flash charging have 7 models of OPPO Find 7, OPPO N3, OPPO R5, OPPO U3, OPPO R7, OPPO R7 Plus and OPPO R7s. OPPO official data says that VOOC flash charging is 4 times higher than traditional charging speed. There are many. It can be charged to 75% of the 3000mAh battery in 30 minutes, and it can be used for 2 hours in 5 minutes.
Note:
The “Charge for 5 minutes, 2 hours of call†data is based on laboratory tests in a specific environment. The actual charging effect may be affected by factors such as battery capacity and temperature, and the actual talk time may vary depending on the state of use of the mobile phone and the environment in which it is used.
VOOC flash charger family:
VOOC not only has a charging head as standard in the mobile phone to plan its own flash-filled map, its "VOOC flash charging life circle", by "VOOC flash charging mobile power", "VOOC car flash charging" and "1560 The OPPO flash charging station is composed of OPPO mini power adapters sold separately.
OPPO provides targeted solutions based on the main activities of a person's life. “VOOC power adapter†can be used at home or office; “VOOC flash mobile power†can be used during business trips; “VOOC car flash charging†can be used on the road; even if you are shopping, there is no peripheral accessories mentioned above. You can also enjoy free charging service at 1,560 OPPO experience stores, and these 1,560 OPPO experience stores basically cover the core business districts of all prefecture-level cities (China has more than 330 prefecture-level cities) in OPPO. The phone can find the nearest flash filling station based on the location. 
VOOC flash charging principle:
OPPO VOOC flash charging no longer uses the traditional 5V 1A or 5V 2A voltage and current charger, but directly raises the charger's output to 5V 4A level, the traditional 4-5pin charging interface has increased to 7pin, mobile phone battery touch The number is also increased to 8 (sometimes the mobile phone battery is not removable, you can't see it), and the multi-channel charging method is used to prevent dangerous situations such as large heat and large current during charging. It is worth mentioning that when other mobile phones that do not support VOOC flash charging are connected to the flash charger, they will also be automatically reduced to 5V 2A mobile phones to protect non-OPPO mobile phones.
MCU smart chip
In order to further alleviate the safety hazard caused by high current charging to the mobile phone battery, VOOC flash charging adds an MCU smart chip to the adapter, thus realizing the open voltage loop and segmented constant current technology. If you compare a mobile phone to a car, the normal charging throttle is only 1.2L. Even if you step on the throttle, you can only start slowly and slowly. The VOOC flashing open voltage loop raises the displacement to more than 3L. As long as the throttle is lightly pressed, it can advance at a rapid speed.
Thanks to the MCU's precise adjustment of current, VOOC realizes segmented constant current and variable gear technology. At the start, VOOC will hang high-speed gear (recognize VOOC charging), and in the middle, it will automatically jump to the middle gear, let You move forward quickly (high current charging), and at the end you switch to low gear, allowing you to get to the station smoothly (turbulent charging), prevent battery overcharge and prevent other side effects. During the actual charging process, we also found that when the charge reached 75%, the VOOC also entered a turbulent state and was smoothly charged in a 5V 2A manner.
It is worth mentioning that VOOC flash charging technology also creates a full-end five-fold protection technology from adapter to interface to mobile phone:
The first level is the adapter overload protection. At the front end, when the current enters the adapter, the sensor detects the voltage and current in real time. When the detection is safe and reliable, the MOSFET (protection) switch automatically turns on the flash. The exception will close immediately.
The second level, flash charge condition identification protection. When the current passes through the adapter, the MCU chip will identify whether the device supports flash charging. Only the support can turn on the flash charging and turn on the second level overload protection.
The third level, interface overload protection. In the middle section, when the current enters the mobile phone, at the specially customized 7pin USB interface, the MCU in the mobile phone controls the third MOSFET (protection) switch to implement the third-level overload protection. 
The fourth level, battery overload protection. At the end, the special IC and MOSFET (protection) switches in the battery form the fourth line of defense, which is responsible for overload protection of the voltage and current entering the battery.
The fifth level, battery fuse protection. In the event of an abnormality, the fuse inside the battery will immediately blow, physically breaking the current input.
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