The latest Quick Charge 3.0 enhances flexibility based on Quick Charge 2.0, and it offering a flexible choice from 3.6V to 20V in 200mV increments.
Nowadays, the threshold of fast charge is not technical, but lies in the identification protocol that the major manufacturers do not share with each other. Of course, there still has a identification protocol that compatible with each other. In July 2012, the USB PD charging protocol was released, the full name is “USB Power Delivery Specification”.
The USB PD sets the five-level specifications of 10W, 18W, 36W, 60W, and 100W according to the power that can be supplied. PD technology not only has a powerful power of charging , but also can provide a two-way charging, which means two devices can be charged with each other with a USB cable connection! PD is not a USB mandatory protocol, just an optional standard.
As we mentioned earlier, the increase in current is bound to cause the Micro USB interface and data lines to be unbearable. In fact, the new USB Type-C interface is meant to solve this problem.
The contacts of Type-C interface are several times more than the Micro USB interface, which greatly increases the current it can withstand. At the same time, the Type-C adds a mutual identification step that defines itself as a charger or powered device. In other words, USB Type- C naturally supports fast charging, and the loss of power will be smaller under the same current, and it can support two-way charging. Therefore, Type-C is bound to become a general direction of mobile phone charging.
For users, the most concerned issue is that will mobile phones and batteries be burned or even explode if the charging speed is too fast. In fact, mobile phones and batteries are developing with the charging technology. According to the current development of mobile phone batteries, the safe charging current is 1C, some new battery can now support the charging capacity of 1.5C or even 2C. The rated value of the charging current for the battery is set by the motherboard of the mobile phone. The mobile phone is actually very “smart”, it can automatically adjust the charging speed. Not to mention the faster the charging speed, the higher the positioning of the mobile phone, and the reliable the materials are used for the mobile phone.
The meaning of quick charging
Because of the existence of the trickle charge process, it takes at least 1 hour and 10 minutes to charge from 0-100%. It only takes another 30 minutes even the mobile phone do not support the quick charging technology, some people think quick charging is useless. Some people think that they can charge all day long, so fast charging is useless.
The biggest meaning of fast charging is the explosive sprint charging stage. In particular, the current power of the new released mobile phones is generally 20W. It takes 10 minutes to charge the phone from 0-25%, if the battery is under 3000 mAh, and it can charge about more than 60% in 30 minutes!
What does this mean? It means that we will completely change our charging habits and even the habit of using a smart phone! In the past, the charging speed was not fast enough, we could only wait slowly. Some of us developed the habit of plugging in and charged the phone for all night long. Mobile power bank is also popular, because no one can tolerate waiting for two or three hours next to the charger.
But with a fast charger, everything will change. Even if you forget to charge at night, the battery is too low or even shut down, as long as you charge the phone while you washing up in the morning, you will have “safe” power before going out. Fast charging is precisely adapted to the actual situation of the current fragmentation of smart phones.
The meaning of quick charging is not only the one or two hours you saved, but more importantly, fast charging can reduce your unnecessary time waste at important moments and provide more usage time. It also lets users not be bound by the charging time, no need to worry about the power. This is the meaning of quick charging.