The hottest six low-voltage high current fast char

Abstract: the core point is to allow the current to be directly input from the battery at the charger end at a lower voltage (5V or lower), eliminating the process of internal high-low voltage conversion (the voltage of the built-in lithium-ion battery is generally about 3.8v-4.2v), so as to improve efficiency and reduce heating. With the sensor that monitors the temperature in real time, it is often more advantageous in safety

2016 can be described as a brilliant year for fast charging. The fast charging function is basically popularized on medium and high-end models, and even some models below 1000 yuan are equipped. Under the background that it is difficult to make a big breakthrough in battery capacity, the fast charging function has become a point that consumers and manufacturers attach great importance to. "Charge for X minutes, talk for X hours" must be heard by everyone's ears. Simply put, charging power p= charging voltage U × Charging current I, so if you look a little deeper, you will find that the mainstream fast charging schemes in 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, accounting for a considerable share, and the latter is represented by oppo's V "OOC flash charging technology. However, at the end of 2016, low-voltage high current fast charging seems to have the upper hand. Now let's review several low-voltage high current fast charging schemes that have been used or will be used in the next session

1. Oppo vooc flash charging

there is no doubt that it is oppo's popular advertising words in China that have promoted users' attention to fast charging. As early as 2014, oppo launched this fast charging technology on its flagship find 7, using the form of parallel shunt at 5V voltage to increase the charging current to 4a-5a. This technology requires the use of special flash charging chargers and data lines, The micro end of the data cable is upgraded from a conventional 5-pin interface to a 7-pin interface. The output specification of the first generation vooc flash charger is 5v4.5a. Later, the vooc Mini flash charger, whose volume is nearly halved, was introduced. The surface was wiped clean, and the output was increased to 5v5a. The latest version of vooc charger ak779 was further adjusted to 5v4a, achieving a balance between volume, efficiency and output. It can be said that oppo has led the domestic fast charging camp for a long time with the technical advantages of vooc flash charging. The disadvantage is that this is oppo's exclusive fast charging technology, which has not been authorized to third-party accessory manufacturers, resulting in users having only 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

oneplus is a brand aimed at people who pursue the texture of products in the recent two years. It is very popular among enthusiasts, geeks and other people at home and abroad. In the one plus three released in June and one plus 3T released in November this year, one plus uses a fast charging technology called dash flash charging. According to the reply of the head of Yijia technology to friends on social media, dash flash charging technology has been authorized by oppo, so dash flash charging is also a low-voltage high current scheme, which also requires the use of a special charger and data cable. The standard charger specification is 5v4a, which is different from the microusb interface of vooc flash charging data cable. Dash flash charging data cable uses type-C interface, which supports positive and negative double-sided plug-in and better user experience

3. Huawei supercharge super fast charging

Huawei released its flagship mate 9 at the end of this year, which uses a number of new technologies, including supercharge super fast charging. During the charging process, the charger end and end will continue to "communicate" and adjust the voltage and current in real time to achieve faster charging speed and lower body temperature, which is 50% faster than the charging speed of mate8 (9v2a) and 5 ℃ lower than S7 edge. Supercharge fast charging also needs the support of special charger and data cable. Different from the former two, it chooses to thicken the USB interface contact and transmission line core. The specification of mate 9 original charger is 4.5v5a. Due to its short marketing time, there is no support of third-party electronic universal testing machine accessories at present

4. Moto turbo power turbo fast charging

Motorola, an old brand manufacturer, has launched its own turbo charge turbo fast charging technology based on Qualcomm's qc2.0 fast charging technology. This year, moto Z series modularization released by moto (renamed after being acquired by Lenovo) is equipped with a new generation of Turbo power turbo fast charging technology. Among them, two models of moto Z Z play support 5v3a (15W) fast charging, and the strongest version moto Z force is sold overseas, Moto Z force is equipped with turbo power as standard? 30 charger, with an output specification of 5v5.7a (28.5w), is the current standard charger with the largest power. According to the evaluation of foreign media, turbo power turbo fast charging is compatible with USB PD protocol. In order to withstand such a large current, the charger and charging cable are integrated

5. Qualcomm quick charge 4 fast charging

in mid November this year, Qualcomm released the next-generation flagship processor Xiaolong 835 in New York, the United States. At the same time, it also announced the quick charge 4 fast charging technology. Although the official announcement did not disclose detailed specification parameters, the author previously learned that one version of qc4 will use 5v/4.7a-5.6a and 9v/3a specifications, The maximum transmission power of 28w will be another level on the basis of the existing qc3.0 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 LETV, a domestic manufacturer, will be equipped with 5v5a/8v3a chargers. Considering the close cooperation between LETV and Qualcomm, it is confirmed that qc4 will practice 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 past qc2.0/3.0

6. MediaTek pump express 3.0 fast charging

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 MV steps in the range of 3v-6v to obtain the best efficiency, and the maximum charging current can exceed 5A. At the first China fast charging technology seminar held in mid June, MediaTek showed the first pump express 3.0 fast charger with an output specification of 5.8v6a (34.8w max), which has greatly exceeded the existing average level. If it is commercially available, the charging time will be further shortened. MediaTek officials said that terminals that support pe3.0 fast charging will be launched at the end of 2016

to sum up, we have reviewed several low-voltage high current fast charging technologies that have been released. The core point is to allow the current to be directly input from the battery at the charger end at a low voltage (5V or lower), eliminating the process of internal high-low voltage conversion (the voltage of the built-in Lithium-Ion battery is generally about 3.8v-4.2v), so as to improve efficiency, reduce heating, and cooperate with the sensor for real-time temperature monitoring, Security is often more advantageous. The rise of low-voltage high current fast charging is also inseparable from the rapid popularization of USB type-C interface. Except for vooc flash charging, the other schemes are based on type-C interface. Looking forward to 2017, there will be more devices using low-voltage high current fast charging technology on the market. Around charging, upstream and downstream manufacturers show us a rapidly changing and gradually clear future