Xiaomi 200w Charger Technology Secret
Due to the limitations of battery technology, fast charging technology is an important supplement to the battery life of mobile phones. It can quickly restore the battery level, and is one of the important performance features cherished by consumers.
Xiaomi is not satisfied with the current fast charging technology, and its flagship models even support 120W wired fast charging.
However, Xiaomi believes that 120W is not fast enough. Recently, they released two heavy-duty upgrades: 200W wired fast charging and 120W wireless fast charging technologies. These upgrades will significantly improve the charging and battery life experience of mobile phones. Even before one is ready, it’s already finished.
So how fast is 200W charger?
With 200W wired charging, 10% can be charged in just 44 seconds, 50% in 3 minutes, and 100% is charged in just 8 minutes! This is the first time wired charging for mobile phones has entered the era of ten-minute charging!
Currently, mobile phone charging is limited by three major bottlenecks:
1. The charging performance of the battery itself, which is affected by materials and battery structure.
2. Temperature, which is affected by the current, internal resistance of the battery core, and circuit resistance.
3. Efficiency, which is affected by the charging circuit and architecture.
Now let’s take a look at the technology behind 200W wired charging.
Firstly, according to official announcements, Xiaomi uses three parallel charged pumps with a conversion efficiency reaching up to 98.6%.
The working principle of a single 2:1 charged pump is to halve the output voltage and twice the output current. This can reduce the current on the charging circuit, thereby reducing circuit loss, helping to improve charging efficiency and reduce heating. For example, if the input power of the charged pump is 9V & 3A, the output to the battery can reach 4.5V & 6A.
Using three charged pumps can significantly increase the charging speed. Compared with a single charged pump, the parallel connection of three charged pumps can provide larger charging currents and disperse the heat pressure. The amount of heat generated is close to that of ordinary charging.
Secondly, according to official announcements, the modified battery of the Xiaomi 11 Pro has a capacity of 4000mAh, which is lower than some phones with 5000mAh batteries. However, the 200W charging speed is still the highest in the industry.
Now, let’s take a look at the 4000mAh 10C graphene super-fast charging battery. This battery is designed with two cells connected in series.
The characteristic of two cells connected in series is that the overall voltage increases while the capacity remains unchanged.
The characteristic of two cells connected in parallel is that the overall voltage remains unchanged while the capacity increases.
Connecting two cells in series greatly reduces the internal resistance of the battery, enhances charging speed, and reduces charging temperature.
Due to the doubling of the total voltage, the serial connection design will bring a faster charging power under the same total current.
Indeed, the improvement of battery technology itself is crucial in the long run.
Larger capacity, more stable, and faster charging batteries are the fundamental advancements we need to solve in the future.