▲ Cross review of five mobile phone fast charging schemes
At present, the fast charging technology of mobile phones can be divided into two categories. The first one is high current charging, keeping the voltage of 5V. After starting fast charging, it can be charged with high current of 4A to 5A. At present, only VOOC flash charging technology of OPPO is adopted. The second is high-voltage fast charging. After the fast charge is started, it can be charged with a high voltage of 9V to 12V, and the charging current can be kept between 1A and 1.8A, which has a relatively safe charging current. This fast charging scheme, represented by QC2.0 in Qualcomm and Pump Express Plus technology in MediaTek, has been integrated into chip schemes in Qualcomm and MediaTek. In addition, Qualcomm's QC2.0 technology is open, so some fast charging technologies derived from Qualcomm's QC2.0 can also be seen on some non-Qualcomm chips, such as Huawei's fast charging technology and ASUS's BoostMaster.
Three mainstream fast charging technologies:
Qualcomm Quality Control 2.0
QC2.0 is the technology of fast charging 2.0, which has been integrated with the fast charging scheme since the introduction of Xiaolong 800 in Qualcomm on 20 13. With the upgrading of Qualcomm's CPU product line, all products after Xiaolong 800 support QC2.0 technology, and the charger specified in QC2.0 protocol can adaptively output 5V, 9V or 12V, so as to quickly charge the mobile devices supporting QC2.0 protocol.
▲QC2.0
The working principle of QC2.0 is simply that the device outputs a voltage signal to the charger through the USB data communication port D+/D-, and the charger has a built-in USB input decoding chip to judge the output voltage of the charger, so there is no special requirement for the charging USB cable. And QC2.0 is divided into two industry standards: Class A and Class B. A standard: 5 V, 9 V and 12 V output voltage, and B standard: 5 V, 9 V, 12 V and 20 V output voltage. At present, most mobile phones that support fast charging use QC2.0A standard.
MediaTek Pump Express Plus
MediaTek's Pump Express Plus technology needs to cooperate with the power management chip made in MediaTek. At present, MT6795 in MediaTek has been able to support the fast charging technology of Pump Express Plus. Theoretically, the fast charging function can be realized by using the dedicated power management chips on all processor platforms in MediaTek. Pump Express Plus provides the charger with an output power greater than 15W, controls the output voltage to increase by 12V, 9V and 7V, and supports12v/9v/7v/5v/4.8v/4.0v/3.8v/3.6v charging.
▲ MediaTek
Pump Express Plus technology allows the charger to determine the initial voltage required for charging according to the current. The pulse current command sent by the power management chip is transmitted to the charger through Vbus of USB. The charger modulates the output voltage according to this command, and the voltage gradually rises to as high as 12V, reaching the maximum charging voltage. Therefore, ordinary USB cable can support the fast charging technology of Pump Express Plus.
OPPO VOOC
In 20 14, OPPO installed VOOC flash charging technology for its flagship product OPPO Find7 for the first time. After using VOOC fast charging technology, 3000mAh battery can charge 75% in 30 minutes, and can talk for 2 hours after charging 10 minutes. VOOC flash charging technology is a patented technology of OPPO, which has been cited in many new mobile phones of OPPO, such as the recent R7 and R7 Plus.
▲OPPO VOOC
OPPO VOOC technology increases the charging current to 4A-5A when the charging voltage is constant at 5V, and shunt it with parallel circuit. Therefore, OPPO VOOC technology needs to use a special charging cable. The OPPO VOOC charging cable interface has 8 electric shocks, which can realize multi-channel 5V charging and improve the charging speed of the mobile phone.
Mobile phone supporting fast charging technology
Our support test is mainly aimed at the three fast charging technologies mentioned above. Of course, there are other improved schemes derived from these schemes, so this evaluation uses OPPO N3, Xiaomi Note High Edition, Meizu MX5, Gionee M5 and Glory 75 mobile phones that support fast charging technology, which can be roughly divided into three formations.
▲OPPO N3
OPPO N3 supports the VOOC fast charging technology of OPPO. OPPO N3 is equipped with a 3000 mA battery and uses Qualcomm Snapdragon 80 1 processor, but it uses OPPO's own flash charging scheme instead of Qualcomm's OC2.0 fast charging scheme.
▲OPPO charger
In terms of charger, OPPO N3 is equipped with 5V5A charger, which supports VOOC fast charging technology, provides multi-channel 5V parallel charging, and can quickly charge 3000 mA batteries.
▲OPPO charger interface
In addition, OPPO N3 must use a dedicated charging cable to use flash charging. The charging cable used by OPPO N3 has the same appearance as the ordinary MicroUSB charging cable, but it can be seen that there are 8 contacts at one end of the MicroUSB interface.
▲ Xiaomi Note high version
The high version of Xiaomi Note supports Qualcomm's QC2.0 fast charging technology, is equipped with a 3000 mAh battery, adopts Qualcomm Snapdragon 8 10 processor and adopts a complete set of Qualcomm scheme, which naturally supports Qualcomm's QC2.0 fast charging.
▲ Xiaomi charger
The charger of Xiaomi Note with high version is relatively compact, but it can support the charging voltages of 5V, 9V and 12V, providing the highest charging specification of 12V 1.22A, and can be charged by ordinary USB cable.
▲ Meizu MX5
Meizu MX5 adopts MT6795 processor from MediaTek, equipped with 3 150 mAh battery, and supports the fast charging technology of Pump Express Plus from MediaTek.
▲ Meizu charger
The charger of Meizu MX5 also supports 5V, 9V and 12V, and the maximum input current is 2A. The fast charging scheme of Meizu MX5 is optimized, and the actual maximum charging current of 9V can reach1.85a..
▲ Gionee M5
Gionee M5 is Gionee's main mobile phone with super battery life. The mobile phone uses 6020mA battery, and adopts dual battery scheme. Of course, it needs super battery to support fast charging technology. Gionee M5 adopts MediaTek MT6735 processor and supports MediaTek Pump Express Plus fast charging technology.
▲ Gionee M5 charger
Gionee M5 charger can provide 5V and 9V charging voltages, and the maximum charging current is 2A. Because many mobile phones that support fast charging will not reach the ultra-high voltage of 12V, the charger of Gionee M5 cancels the charging voltage of 12V.
▲ Glory 7
Glory 7 is equipped with 3 100 mAh battery and uses Kirin 935 processor. Glory 7 also supports fast charging technology. Glory 7 adopts Huawei fast charging technology, which is also a derivative version based on Qualcomm QC2.0.
▲ Glory 7 charger
Only the full netcom version of Glory 7 is equipped with a fast charging charger, and other versions are only equipped with a 5V2A charger. Glory fast charging charger only provides 5V and 9V charging voltage, and does not provide 12V charging voltage.
100% charging test
For these five mobile phones, let's first conduct a complete charging test. This test starts charging with the remaining 1% of the mobile phone, and records the time required to charge to 100%. Turn off the screen when charging, because the time of opening the screen will affect the charging current. Let's take a look at how long it takes for OPPO N3, Xiaomi Note High Edition, Meizu MX5, Gionee M5 and Glory 7 to be fully charged.
▲ Charging takes time.
Except for Gionee M5, which has a battery of 6020mA, the battery capacity of the other four mobile phones is around 3000mA. We can also divide the charging time of Gionee M5 by 2, so that the battery capacities of the five mobile phones are basically the same. It can be seen that the charging time of these five mobile phones is the shortest, and it only takes 77 minutes to fully charge, while the charging time of Meizu MX5, Glory 7 and Gionee M5 is about 90 minutes after half conversion, while the charging time of Xiaomi Note is slightly longer, which is 99 minutes. On the whole, the charging speed of five mobile phones based on the three schemes is already quite fast, and the 3000 mAh battery is fully charged in one and a half hours, while the previous 5V2A charger takes at least two and a half hours.
Voltage curve/current curve/temperature curve
After understanding the fast charging time of five mobile phones, we need to further analyze the fast charging process. We use special tools to detect the charging current and voltage of these five mobile phones, and at the same time detect the battery temperature during charging on the mobile phones.
OPPO N3
▲OPPO N3 charging curve
Because VOOC flash charging technology adopted by OPPO N3 can't detect current and voltage with special tools, we can only record the charging curve and charging temperature when OPPO N3 charges. It can be seen that it takes 77 minutes for OPPO N3 to charge. Before 60%, the charging speed was very fast, and after 60%, the charging speed began to decrease. It is believed that the charging current also began to decrease after 60%, and the highest battery temperature reached 39.9 degrees Celsius. However, as the charging speed slows down, the battery temperature also begins to decrease.
Xiaomi Note high edition
▲ Xiaomi Note charging curve
▲ Xiaomi note current-voltage curve
The high version of Xiaomi Note adopts Qualcomm QC2.0 fast charging technology. It can be seen that the charging speed is at a relatively average speed from the beginning to 80%. After 80%, the charging speed began to slow down, while the charging voltage remained around 9V during the whole charging process, while the charging current was around 1. 15V from the beginning to 80%. After 80%, the charging flow starts to decrease and the charging is completed.
MEIZUMX5
▲ Meizu MX5 charging curve
▲ Meizu MX5 current-voltage curve
Meizu MX5 adopts MediaTek's Pump Express Plus fast charging technology, and it can be seen that the charging speed is maintained at a relatively high speed until 60%. By comparing the charging current and voltage, it can be found that Meizu MX5 is charged at the highest high voltage and high current of 9. 15V 1.85A, and it keeps 60% of the power. When the power reaches 95%, it will drop to 5V, so the charging power will gradually increase in the later period.
Gionee M5
▲ Gionee M5 charging curve
▲ Gionee M5 current-voltage curve
Gionee M5 also uses MediaTek's Pump Express Plus fast charging technology. It can be seen that the charging curve is a little different from Meizu MX5. The charging speed of Gionee M5 decreased from 75%, and Gionee M5 was initially charged in 9. 19V 1.44A mode. The charging current is lower than Meizu MX5, and it is also changed to 5V when the power reaches 95%.
Glory 7
▲ Glory 7 charging curve
▲ Glory 7 Current-voltage curve
Judging from the charging curve and current-voltage curve of Glory 7, Huawei's fast charging scheme is QC2.0 scheme of Qualcomm. It can be seen that the voltage was kept at 9.06V during the whole charging process, and the current decreased from 1.45A at the beginning to 0.32A at the end. The charging speed of Glory 7 began to slow down from 70% of the charge, and then the charging current changed greatly at 95%.
How long does it take to charge for 5 minutes?
▲ discharge test
Every fast charging scheme says that it can take xx hours to charge for 5 minutes, but there are certain conditions. Charging for 5 minutes when the power is low is completely different from charging for 5 minutes when the power is medium and high, because the charging current is higher when the power is low, and the charging amount for 5 minutes is more than that when the power is medium and high. How long does it take for users to charge for 5 minutes in an emergency? Let's do a test. Let's put the battery of the mobile phone at 10%, then turn off the screen of the mobile phone to charge for 5 minutes, and then play the video of 1080P to see how long it will take these five mobile phones to restore the battery to 10%.
▲ Charge for 5 minutes.
After charging five mobile phones for five minutes, you can see that OPPO N3 charges the most, followed by Meizu MX5. Because the battery capacity of Gionee M5 is twice that of the other four mobile phones, it can be regarded as a 3000mA battery, which can charge 6% of electricity in five minutes.
▲ Video playback time
After playing 1080P video with these five mobile phones, it can be seen that when OPPO N3 plays 1 hour, the charging power is exhausted and the power is restored to 10%. The second place is Meizu MX5, which takes 56 minutes, and the worst result is the high version of Xiaomi Note. Of course, this test is affected by factors such as screen size resolution and hardware configuration, and is for reference only.
Test summary
By testing five mobile phones that support fast charging, we can see that there are three kinds of fast charging technologies, namely Qualcomm QC2.0, MediaTek Pump Express Plus and OPPO VOOC. The result of this test is also beyond our expectation. OPPO VOOC has the best flash charging performance, which can charge the whole battery in the shortest time, and can charge 13% in 5 minutes. There are many mobile phones ahead of QC2.0 in Qualcomm and Pump Express Plusd in MediaTek. OPPO is still very strong in flash charging technology, but OPPO's flash charging can only be used on its own mobile phones.
▲ charger
Qualcomm's QC2.0 and MediaTek's Pump Express Plus have good performance. The technologies of the two companies are almost the same, and 1.5 hours can fully charge 3,000 mA batteries, especially Meizu MX5 charges in 9V 1.85A mode, which can further shorten the charging time. Both Qualcomm QC2.0 and MediaTek Pump Express Plus have good versatility, and even QC2.0 can be licensed to manufacturers in Qualcomm based on the scheme of chip manufacturers, which has good versatility.
Compared with the three fast charging technologies, OPPO VOOC has the advantage of high speed, which can only be used on OPPO mobile phones, and it also has requirements for charging cables. Qualcomm QC2.0 and MediaTek Pump Express Plus adopt relatively open standards and are universal. Although the speed is not as fast as OPPO VOOC, it can be charged quickly with an ordinary USB cable.
Support ▲ Mobile phones that support fast charging.
I believe that a large number of mobile phones supporting fast charging technology will land on the market in the future. With the increasing battery capacity of smart phones, the demand for charging will continue to increase, and manufacturers such as Qualcomm, MediaTek and OPPO will constantly update the fast charging technology. We hope to see more and better fast charging solutions in the market.