The so-called fast charging is to adjust the input voltage and current of the mobile phone through the chipset, thus shortening the charging time. It is usually divided into three situations: boosting constant current, low voltage and high current. Simply put, charging power P= charging voltage U x charging current I, so if you look deeper, you will find that the mainstream fast charging schemes on the market are divided into high-voltage fast charging and low-voltage fast charging. The former is represented by Qualcomm QC2.0/QC3.0 and mtk PE 1.0/2.0, and the latter is represented by OPPO's VOOC flash charging technology.
VOOC flash charging
On the basis of constant charging voltage, the charging current and charging power are greatly increased. This greatly shortens the charging time.
As we all know, power = voltage * current. When VOOC is charged, the constant voltage is 5V, the current is raised to 4A-5A, and the power can reach 25W. The mobile phone can basically get 75% of the electricity after charging for 30 minutes, so there is a slogan of "charging for 5 minutes and talking for 2 hours".
This charging scheme is easy to cause the phone to overheat, and VOOC flash charging innovatively transplants the charging control circuit originally in the phone to the power adapter, so that all the heat is concentrated on the adapter, which greatly reduces the phone overheating.
Quality control 3.0
The "optimal voltage intelligent negotiation" algorithm is adopted for the first time. On the basis of constant current, through INOV dynamic voltage regulation technology, the optimal charging power of any mobile phone can be intelligently adjusted to improve the charging power.
QC3.0 provides a voltage boost of 3.6V to 20V in the unit of 200mV, which will enable the mobile phone to get just the right voltage when charging, reach the expected constant current, minimize power consumption and improve charging efficiency.
VOOC flash charging is the main advantage of OPPO series mobile phones, and the technology is independently developed by OPPO. Compared with QC3.0, the safety factor is higher, the power will be higher than QC3.0, and the charging speed is slightly faster in theory.
As a "compensation" for the battery life of today's smart phones, fast charging meets the fragmented charging method of users. VOOC flash charging is slightly ahead of QC3.0 in technology and safety, breaking the rumor that "domestic products can't make good things"
Let's take a look at several low-voltage and high-current fast charging schemes that have been used or will be used in mobile phones.
1, OPPO VOOC flash charging
VOOC flash charging is superior to QC4.0. Transverse comparison of six low-voltage and high-current fast charging schemes
The output specification of the first generation VOOC flash charging was 5V4.5A Later, nearly half the volume of VOOC mini flash charging was introduced, and the output was increased to 5V5A. The latest version of VOOC charger AK779 is further adjusted to 5V4A, achieving a balance of volume, efficiency and output.
It can be said that OPPO has long led the domestic fast-charging mobile phone camp with the technical advantages of VOOC flash charging. The disadvantage is that this is OPPO's exclusive fast charging technology, and it is not authorized to third-party accessory manufacturers, resulting in users only having official accessories to buy at present.
VOOC flash charging is equipped on OPPO's R series and N series high-end models.
2.ONEPLUS)DASH flash charging
VOOC flash charging is superior to QC4.0. Transverse comparison of six low-voltage and high-current fast charging schemes
ONEPLUS is a brand launched for people with a sense of quality in the past two years, which is deeply loved by fans, geeks and other people at home and abroad. On the one plus three mobile phones released in June this year and the one plus three mobile phones released in June165438+1October, one plus uses a fast charging technology called DASH flash charging.
According to the reply from the person in charge of Yijia Technology to netizens on social media, DASH flash charging technology has been authorized by OPPO, so DASH flash charging is also a low-voltage and high-current solution, which also requires the use of special chargers and data cables. The standard charger specification is 5V4A.
Different from the MicroUSB interface of VOOC flash charging data cable, DASH flash charging data cable adopts Type-c interface, which supports positive and negative double-sided insertion and better user experience.
3. Huawei SuperCharge Super Fast Charge
VOOC flash charging is superior to QC4.0. Transverse comparison of six low-voltage and high-current fast charging schemes
Huawei's flagship Mate 9 mobile phone released at the end of this year adopts a number of new technologies, including SuperCharge Super Fast Charge. During the charging process, the charger and the mobile phone will constantly "communicate" and adjust the voltage and current in real time to achieve faster charging speed and lower body temperature, which is 50% faster than Mate8(9V2A) and 5% lower than S7 edge.
SuperCharge fast charging also needs the support of special charger and data cable. Different from the first two, it chooses the way of thickening USB interface contacts and power cord core. Mate 9 original charger specification is 4.5V5A A. Due to the short time to market, there is no third-party accessory support at present.
4.Moto Turbo Power turbo fast charging
VOOC flash charging is superior to QC4.0. Transverse comparison of six low-voltage and high-current fast charging schemes
Motorola, a veteran mobile phone manufacturer, once launched its own Turbo Charge turbo fast charging technology based on QC2.0 fast charging technology in Qualcomm. This year, Moto Z series modular mobile phones released by Moto (renamed after being acquired by Lenovo) are equipped with a new generation of turbo power turbo fast charging technology, among which Moto Z&; Z Play supports 5V3A( 15W) fast charging, and the strongest version-Moto ZForce is sold overseas. Moto Z Force comes standard with Turbo Power 30 charger, and its output specification is 5V5.7A(28.5W), which is the most powerful one among the standard chargers at present.
According to foreign media evaluation, Turbo Power turbo fast charging is compatible with USB PD protocol. In order to withstand such a large current, the charger and the charging line are integrated.
5, high-pass fast charge 4 fast charge
VOOC flash charging is superior to QC4.0. Transverse comparison of six low-voltage and high-current fast charging schemes
In the middle of June this year, 5438+065438+ 10, Qualcomm released the flagship processor of the next generation mobile phone-Xiaolong 835 in new york, USA, and also announced the Quick Charge 4 fast charging technology. Although the official announcement did not disclose the detailed specifications, the charging head network learned that a version of QC3.0 will adopt the specifications of 5V/4.7A~5.6A and 9V/3A, with a maximum transmission power of 28W.
According to the information published in the 3C certification catalogue of the Ministry of Industry and Information Technology, a new machine that has not been released by domestic mobile phone manufacturer LeTV will be equipped with a 5V5A/8V3A charger. Considering the close cooperation between LeTV and Qualcomm, it is determined that QC4 will implement the parallel route of low-voltage fast charging and high-voltage fast charging, which should be based on the judgment of industry trends and the consideration of the compatibility of previous QC2.0/3.0.
6, MediaTek Pump Express 3.0 fast charge
VOOC flash charging is superior to QC4.0. Transverse comparison of six low-voltage and high-current fast charging schemes
On the eve of the opening of ComputeX in Taipei in June this year, MediaTek released the latest generation of Pump Express 3.0 fast charging technology. The charging voltage can be adjusted in steps within the range of 3V-6V 10-20mV to obtain the best efficiency, and the highest charging current can exceed 5A. At the first seminar on fast charging technology held in China in mid-June, MediaTek showed the first Pump Express 3.0 fast charging with an output specification of 5.8V6A (maximum 34.8W), which has greatly exceeded the existing average level. If commercialized, the charging time of mobile phones will be further shortened. MediaTek official said that the terminal supporting fast charging of PE3.0 will be listed at the end of 20 16.
To sum up, I took stock of several low-voltage and high-current fast charging technologies that have been released at present. The core point is that the current is directly input into the mobile phone battery from the charger at a lower voltage (5V or lower), which saves the process of high-low voltage conversion inside the mobile phone (the voltage of the built-in lithium-ion battery in the mobile phone is generally around 3.8V-4.2V), thus improving efficiency and reducing fever. Real-time temperature monitoring with sensors is often more advantageous in terms of safety.
The rise of low voltage and high current fast charging is also inseparable from the rapid popularization of USB Type-C interface. Except VOOC flash charging, other schemes are based on Type-C interface.
In addition, we don't choose Qualcomm's fast charging scheme, mainly because our own Dash flash charging still has many advantages.
As many people know, one plus Dash flash charging is actually a customized version of VOOC flash charging developed by OPPO, which adopts a large current fast charging scheme and is very representative. Dash flash charging supports up to 5V/4A, that is, up to 20W charging power.
Qualcomm's fast charging technology, from the initial QC 1.0 to the now widely used QC3.0, has chosen the high-pressure fast charging scheme. Nowadays, in mainstream mobile phone applications, its charging load has also developed from the initial 5V/2A to 9V/2A or even 12V/2A (in fact, it can be higher and can be customized according to the needs of manufacturers, but it is generally 24W for safety.
The following are the key points. In addition, we will insist on using Dash flash charging for the following reasons:
1.Dash flash charging adopts a large current scheme, which leaves heat on the power adapter, so that the phone will not overheat during the whole charging process, and playing while charging will not affect the experience. You can touch the adapter and mobile phone to verify this.
2.Dash flash charging adopts a large current scheme, and the loss of voltage transmission in the wire is smaller, which means that the actual power of mobile phone charging is higher and the light conversion rate is higher.
3.Dash flash charging supports bright screen fast charging, even if the screen is lit, fast charging will not end. Some schemes that adopt QC fast charging will reduce the charging power when users use it, and the charging speed will naturally decrease.
4.QC3.0 still has a fatal problem. Because of the charging protection, the charging power will also drop when the mobile phone is hot after QC3.0 charging. However, this problem does not exist in Dash flash.
Of course, Dash flash charging also has some disadvantages:
1. Fast charging will have a great impact on the battery. Dash flash charging is more serious than fast charging in this respect. But generally speaking, two years is no problem.
The popularity of 2.2. Dash flash charging is not high, so it needs a special charger and wires. That is to say, the versatility is not very good.
However, at present, these two points are not fatal. Judging from the development trend of fast charging this year, some mobile phones on MediaTek and Qualcomm platforms are likely to use Pump Express 3.0 and QC4 technologies in the second half of the year. The former is a high current scheme, and the latter also provides the choice of high current and high voltage. If there is no accident, in the next few years, one plus Dash flash charging will be the popular trend of fast charging, and one plus will naturally not choose to change the plan.
The most important thing is to add a Dash flash charge.
Legend has it that Dash Flash Charge and OPPO VOOC Flash Charge are quoted by Tesla, and Musk wants to buy the patents of these two flash charges and use them on Tesla. But in the end, I don't know. This shows that they are powerful.
Dashboard fast flash charging
According to customer service introduction, DASH flash charging is a flash charging technology specially designed for one plus mobile phone based on the authorization of VOOC flash charging technology and combined with USB Type-C interface.
DASH flash charging is different from the general high-voltage fast charging method, and the DASH flash charging adopts the low-voltage fast charging method of 5V/4A. DASH flash charging integrates charging IC into DASH charger, which effectively avoids the charging heat problem existing in traditional fast charging. What's more, it's a favorite of mobile phone maniacs to play while charging and supporting.
How fast? We measured one plus 5T:
According to the actual measurement, it takes 78 minutes to complete a charging cycle by charging 57% for 30 minutes and 97% for 60 minutes. That's great, right?
Look at a better one. Before the release of one plus 5T, one plus official also did an experiment: charging for half an hour, one plus 5T power reached 57%, while iPhone 8 Plus only had 16%, and Google Pixel 2 XL only had 1 1%. It can be said that the charging speed of one plus 5T is not a little faster.
In addition to being fast, Dash fast charging is also very safe.
One plus 5T mobile phone DASH flash charging technology, from the adapter to the mobile phone terminal, protects the power supply through five full-terminal technologies: adapter overload protection, flash charging condition overload protection, interface overload protection, battery overload protection and battery fuse protection, which can provide comprehensive security for flash charging.
It's not that Qualcomm's fast charging technology is not good, but why don't you use it when you have such good technology?
In fact, both Qualcomm's QC fast charge and DASH fast charge are essentially aimed at improving the charging power of the battery, but the former is realized by increasing the voltage, while the latter is realized by increasing the current. According to our familiar physical knowledge, in general, the former will lose less when transmitting energy, so it seems unreasonable to add DASH fast charge.
But in fact, what many people ignore is that the current that QC fast charge finally inputs into the battery is still in the form of low voltage and high current, because QC fast charge only uses a relatively high voltage from the charger to the mobile phone. After the current enters the mobile phone, it still needs a voltage conversion to charge from high voltage to low voltage, while the charging voltage of general lithium batteries is about 4.2V to 4.4V, so the current of QC fast charging still needs a voltage drop in the mobile phone, here.
Where did all this lost energy go? This is the heat that becomes the conversion circuit. Therefore, if QC fast charging is used, the mobile phone will be a little hot when charging, and battery charging will make the battery in a relatively high temperature environment, which will aggravate the battery loss to some extent. Therefore, QC fast charging is more about reducing the loss during transmission and compatibility with conventional data lines.
According to the law of conservation of energy, the current will increase after high voltage turns to low voltage, so the ultimate goal of QC fast charging is high current charging.
One plus DASH is another matter. When it enters the fast charging state, the charging circuit in the mobile phone will enter the conductive state, with little heat, and the corresponding charging function will be transferred to the mobile phone charger. If we use ammeter and voltmeter to measure the output of the charger, we will find that the output voltage is about 4.5V-4.6V and the current is between 3A and 4A. Simply put, the charger directly charges the battery, and the heat source is transferred from the mobile phone to the external charger. The cell phone battery only bears its own heat, so the cell phone is naturally much cooler.
But what are the disadvantages of doing so? That is, the data cable and charger must match. The data line of DASH fast charge is customized, and the current transmission line has been specially strengthened, which can keep large current transmission and reduce the loss. At the same time, the redundant pins of the Type-C interface are used for charging handshakes. The end result of these designs is that if you want to enjoy DASH fast charging, you must use supporting equipment.
Oh, by the way, DASH fast charge is actually OPPO VOOC fast charge. In fact, one plus has a close relationship with OPPO, and many technologies of the two are the same, so the VOOC fast charging charger can also be used for DASH fast charging, but the data lines of the two are different, so remember to keep your data line when refueling, otherwise DASH fast charging may be goodbye to you.
One plus one is a branch of oppo. Since it is a branch, he can use vooc flash charging, which is safer and more stable. You have to pay a patent fee for using qc flash charging. It's not stupid to add one.
One plus is customized for enthusiasts. Why not look for the series of oppo, because oppo itself is high-priced and low-priced, but he knows that if he wants to compete with online brands such as Xiaomi, he can't compete with mobile phones with high-priced and low-priced, but oppo can't produce another series of oppo to make up for the shortcomings of low-priced and high-priced. So, one plus is established.
One plus is popular overseas, but it is still a niche brand in China, similar to Nubian and zuk.
Well, you can check r 1 1 and one plus five anyway. There is little difference in appearance, the camera is similar, and there is still a lack of innovation besides high performance. This is the style of oppo, which is also the reason why One Plus is not popular in China. No innovation, taking the strongest processor as a gimmick, others were killed by the opoo Navy when they had black technology. Don't you need it in this era?
Obviously, dash flash charging is better than QC fast charging. Why did he use QC?
When qc charges quickly, the internal pressure of the mobile phone is reduced, which is very hot, while dash depresses the pressure in the adapter, so all mobile phones are not hot, so you can flash while playing. Multiple protections also make dash safer than QC and charge faster than him. Only when the brain is burnt out can QC be used.
I understand it this way, regardless of current and voltage, it will have an impact on the battery, but no one has studied how big the impact is. Sony adopts Qualcomm QC3.0 with self-adaptive charging. It will automatically turn off when it is charged to 90% at night, and finally 10% will be fully charged half an hour before getting up, thus avoiding repeated charging and protecting the battery cycle times to some extent. One plus is fast, but the number of cycles of lithium batteries is not specified, and it is still a bit lacking.
QC flash charging comes with Qualcomm U, which has higher penetration rate and better compatibility. Why do you have to choose oppo VOOC flash charging?
In addition, we don't choose Qualcomm's fast charging scheme, mainly because our own Dash flash charging still has many advantages.
As many people know, one plus Dash flash charging is actually a customized version of VOOC flash charging developed by OPPO, which adopts a large current fast charging scheme and is very representative. Dash flash charging supports up to 5V/4A, that is, up to 20W charging power.
Qualcomm's fast charging technology, from the initial QC 1.0 to the now widely used QC3.0, has chosen the high-pressure fast charging scheme. Nowadays, in mainstream mobile phone applications, its charging load has also developed from the initial 5V/2A to 9V/2A or even 12V/2A (in fact, it can be higher and can be customized according to the needs of manufacturers, but it is generally 24W for safety.
The following are the key points. In addition, we will insist on using Dash flash charging for the following reasons:
1.Dash flash charging adopts a large current scheme, which leaves heat on the power adapter, so that the phone will not overheat during the whole charging process, and playing while charging will not affect the experience. You can touch the adapter and mobile phone to verify this.
2.Dash flash charging adopts a large current scheme, and the loss of voltage transmission in the wire is smaller, which means that the actual power of mobile phone charging is higher and the light conversion rate is higher.
3.Dash flash charging supports bright screen fast charging, even if the screen is lit, fast charging will not end. Some schemes that adopt QC fast charging will reduce the charging power when users use it, and the charging speed will naturally decrease.
4.QC3.0 still has a fatal problem. Because of the charging protection, the charging power will also drop when the mobile phone is hot after QC3.0 charging. However, this problem does not exist in Dash flash.