From 5v1a to 120W, how do we handle the fast charging technology?

[PConline In today’s fast-paced life, the service life of mobile phones has a great impact on the user experience. In today’s technological conditions, there are three main ways to improve the service life of mobile phones: 1. Optimize the software system to reduce the power consumption of the software; 2. Use the processor with more advanced process technology to reduce the power consumption from the hardware level; 3. It is the simplest and crude method with larger capacity Battery.

the contribution of the first two methods in reducing power consumption is very limited, while the third method is also quite embarrassing in the current situation. Although graphene battery has been proposed for more than N years, it is still difficult in commercial application. Lithium battery is still the main stream in the current market, which means that if you want to improve the capacity, you must increase the volume, Now the size of the mobile phone is not small, and the weight of half a kilogram is close to the limit that users can accept. As a result, a new idea of saving the country with a curve appeared, that is, faster charging speed.

a few years ago, before the advent of fast charging technology, we all used the same 5v1a. At that time, the battery capacity of mobile phones was basically within 2000 MAH, and the charging time of about two hours was barely acceptable, However, in the era of mobile phone capacity of 4000 MAH, in addition to a fruit phone is still equipped with 5v1a charger as standard, how many manufacturers dare to provide their flagship with 5W charger? Now that 40w65w fast charging head has become the standard configuration of Android flagship, how much do you know about fast charging technology? Today, I’m going to talk to you about the quick charging of mobile phones.

first of all, you should at least know some basic knowledge about charging, such as power = voltage x current, and the higher the charging power, the faster the charging speed. Therefore, if you want to improve the charging speed, you should start with increasing the charging voltage and current.

at present, the fast charging schemes are mainly divided into high-voltage fast charging and low-voltage fast charging. For example, QC fast charging protocol, which is more common in Android phones, belongs to high-voltage fast charging. The charging power can be improved by increasing the voltage. However, there is a problem with this fast charging scheme, which seriously limits the charging efficiency of the device. In order to solve this problem, Qualcomm launched qc3.0 in 2015, added voltage intelligent algorithm, and fully used tpye-c interface to replace the original micro interface to better control the heating situation. At present, the latest qc4.0 also adds USB PD support, up to 28w fast charging.

and oppo is the leader in low-voltage and fast charging. The slogan of “five minutes for charging and two hours for calling” was deeply rooted in the hearts of the people, Compared with the high-voltage fast charging, the low-voltage fast charging avoids the heating problem by the way of low-voltage and high-current, so there was a better charging experience at that time. However, in front of the fast charging of 50-60 watts, no matter what kind of fast charging scheme is adopted, the fast charging charger will be more or less hotter than the ordinary charger.

take the 65W charger as an example. If silicon is still used as the basic material, it will not only be very bulky, but also generate terrible heat. As you can see from Apple’s 85W fast charging head, the emergence of the third generation semiconductor gallium nitride solves this problem very well, Compared with silicon, gallium nitride has higher melting point, lower loss and higher switching frequency. Low loss can reduce the heating caused by conduction resistance, and high switching frequency can reduce the volume of transformer and capacitor, which can be said to be the future trend in the field of fast charging.

this time, we are experiencing the Gan 2 Pro Gan fast charging charger of Beisi. It was hard to imagine a 120W charging head in this volume before. With two type-C interfaces and one USB interface, the single port type-C supports up to 100W fast charging, which is the power limit of the type-C interface, Of course, if you want to use 100W fast charging, you must use the supporting data cable. Fortunately, one of the fast charging chargers of Beisi has been equipped, which can basically meet the needs of daily fast charging. Even if you charge two laptops with 60W at the same time, there is no pressure at all. It is a good news for users who often have to take multiple devices to work on business.

at the same time, Beisi’s charger also supports a series of mainstream mobile phone fast charging protocols, such as pd3.0, qc4 +, qc3.0. However, it should be noted that some mobile phones have their own private protocols, such as oppo’s 65W, Huawei’s 40W, and so on. If these models want full power fast charging, they can only use their own official chargers.

the pin of Beisi’s Gan 2 Pro charger is foldable and placed on the side, instead of those 65W fast charging chargers, which are all located on the top, they will not stand high on the row plug, and look more coordinated. In the overall use, due to the use of BCT nano heat dissipation technology, the heating condition is also well controlled. At 29 ℃ room temperature, it can be basically controlled within 70 ℃.

multiple protection circuits such as over-current, over-voltage and temperature protection have also declined. It is indeed a product worthy of consideration for users with multiple fast charging devices.

Author: zmhuaxia