Although most consumers know that iPhones can support fast charging, and major media have roughly reported relevant knowledge, but due to the information is fragmented and professional, so most users just stay on "knowing", and not clear on the specific. The highest value can reach 20W of PD fast charging power for iPhone, but apparently, Apple will not be so kind that the original factory is equipped with a full set of PD fast-charging accessories. It is Apple’s long-standing "tradition" for users to purchase it by themselves. Many iPhone users who are not aware of fast charging for the first time and have spent the waste money and cannot get what they want. In this article, I will talk to you about the fast charging of iPhone PD in a simple and easy-to-understand way.

5V Charging

As we all know, the original iPhone charger is the only 5V1A. The poor 5W power makes the charging time unbearable. Most users will buy additional chargers to speed up the charging speed, such as the common 5V2.4A or 12W charger. . iPhone 6 plus, iPhone 7 plus support 5V2.0A10W charging power, while iPhone 8, iPhone 8 Plus, iPhone X further increase the power, support 5V2.4A, which is 12W charging power.

Whether a charger supports Apple depends on the compatibility of the charger, that is, whether it supports the Apple protocol. Common 5V chargers use USB-A sockets, there are 4 contact shrapnels in the sockets, the two sides are responsible for power supply V+V- (voltage positive and negative voltage), and the middle two pieces are used for D+D- (positive data, negative data) of the transmitted data. When the mobile phone is plugged into the charger, the mobile phone and the usb cable will detect whether D+D- has the Apple identification protocol. If there is no identification protocol, the mobile phone will run at 5V 0.9A charging state, only when the Apple protocol (apple 2.1A / apple 2.4A) is detected, the mobile phone will be charged at full speed according to 5V2A or 5V2.4A.

USB-C

Different from the common "USB-A" interface, PD fast charging relies on another interface "USB-C". This new type of double-sided blind plug-in physical interface has greatly increased the upper limit of data transmission and power transmission. The data transmission rate is as high as 10Gbps. In simple terms of use, in addition to transferring files to the mobile phone, it can also be connected to a display as a signal transmission cable, and can be connected to a solid-state drive to run at full speed. In terms of power supply, USB-C supports up to 20V5A or 100W power transmission demand, which can meet the performance needs of electronic products in the next few years. USB-A is through D+D- to protocol identification, but USB PD needs to use the CC cable to communicate. That is to say, must use USB-C charger then have the PD fast charging function.

PD fast charging:

This table is monitored and generated by the ChargerLAB POWER-Z USB tester. It is the current and voltage data of the iPhone X charging from 0%~100%. This table can analyze the iPhone PD charging strategy. It is divided into 5 stages.

Stage ①: iPhone X is turned off when the battery is 0%. At this time, plug in the PD charger, and the iPhone will detect whether it supports the Apple 5V2.4A protocol. If it is, it will charge at 5V2.4A. Apple’s original 29w / 61w / 87w PD chargers all come with the apple 5V2.4A protocol, but most PD chargers do not have the apple2.4A charging protocol, which means that these secondary factory chargers are turned off when they are turned off. It will only charge with 5V0.9A until it is turned on. Of course, this period will not be very long and only a few minutes.

Stage ②: After the charging is automatically turned on, the iPhone starts to communicate and contact the PD, apply for PDO2 (the second voltage file) from the charger, and then charge at full speed with high power, the peak power reaches 20W, and the average power 14W, until the power reaches 50%, and the time is about 30 minutes.

Stage ③: As the battery voltage of the iPhone increases and the saturation increases, the input is continuously reduced at this time for life considerations. The power is slowly reduced from 14W to about 8W, and the percentage of power at this stage is from 50% to 75%.

Stage ④: Entering stage ④, it becomes the power constant stage, and the power is maintained at about 5W. It can be seen from the curve that the PDO2 9V falls back to PDO1 5V during this stage. Although the voltage has changed, both voltages keep the power constant at about 5W, corresponding The battery percentage is 75%~88%.

Stage ⑤: Charging is coming to an end, continue to maintain PDO1 5V to convert to traditional constant voltage (CV) charging, and the current will gradually decrease until it is fully charged.

If you are anxious for the answer, the above paragraph can solve your question. If you want to learn more about the type c charger, you can continue to read this article. I will talk to you from the following perspectives Expand this topic:

• What are the conditions for fast charging?
• How to judgment your phone enter to the fast charging?
• Is it normal for the phone to heat up during fast charging?
• Why does it start to slow down after charging to 80%?
• It is better if the higher the power of the PD fast charger?
• Three obvious advantages of PD fast charger

What are the conditions for fast charging?

Some people say that after connecting their mobile phones to the charger, the charging speed has not increased significantly. What is wrong with the operation? Before fast charging, we must first understand the conditions for realizing fast charging:

1. The mobile phone must support the PD fast charging function, the following models can support fast charging,
   iPhone8, iPhone8 Plus, iPhone X, iPhone Xs, iPhone Xs Max and iPhone XR;
2. The charger must support PD fast charging protocol;
3. The fast charging cable must be the original or MFi-certified Type-C to Lightning cable, using the original chip and the original terminal head (the appearance is silver).
4. These three poits must exist, and if there any one not have, it is impossible to achieve fast charging.

How to judgment your phone enter to the fast charging?

There have been controversies on the Internet about whether Apple’s fast charge is entered into fast charge after a few beeps. Related professionals said that no matter how many beeps, it is entered into fast charge. So as Apple fans, how do we make sure that the mobile phone is fast charging?

• The most intuitive way is to start charging when the iPhone’s battery is low, and it can be fully charged by 50% or more in half an hour, which means that the phone is fast charging.
• Another more professional method is to use a professional ammeter to test the charging power when charging. If the maximum power can reach 18W, it also means that the phone has entered the fast charging mode.

Is it normal for the phone to heat up during fast charging?

• There is no doubt that the temperature during fast charging is higher than that of normal charging. After all, there is more than a little difference between the power of 18W and 5W. As long as the heating degree is within the normal range, it is OK.
• Here we can take the official indicators as a reference. The iPhone’s official charging temperature is 0-35°, and the actual hand feels only slightly hot. If it is very hot, it means that the heat is abnormal and charging should be stopped. In addition, the heating of charging is also related to the surrounding environment. For example, in air-conditioned rooms and winter environments, the heating of mobile phones will be significantly reduced.

Why does it start to slow down after charging to 80%?

Users who have used fast charging may have noticed that after iPhone fast charging is 80% full, the charging speed starts to slow down. Why is this?

• It is to protect the battery and prevent overheating caused by long-time high-power charging. When the charging reaches 80%, the battery management system will intervene and switch to the constant voltage (5V) charging mode while reducing the current. At this time, the charging speed is natural It's slower. When the battery power is about to be fully charged, it will switch to trickle mode again to supplement the power with a small current.
• If the charging is above 70%, and it suddenly slows down. It may be because the temperature of the phone body increases due to fast charging. The device turns on self-protection and limits the charging current. As the temperature drops, the charging power will slowly increase, so don't worry.

It is better if the higher the power of the PD fast charger?

At present, the PD fast charger has 18W, 20W, 30W, 61W, 87W, 96W, and other specifications on the market. Some users think that the higher the power, Is the faster the charging speed when higher the power?

• The peak charging power output depends on the maximum power of the device. For example, the iPhone supports up to 18W PD fast charging. No matter how much power the PD charger, it can only reach 18W fast charging. The same is true for iPads that support up to 30W charging. When choosing a PD fast charging head, users can choose according to their needs.
• In addition, the high-power PD fast charger is backward compatible with low-power devices, and can automatically identify the power required by the device. While achieving fast charging, it also guarantees the charging safety of the device.

Three obvious advantages of PD fast charger

USB PD is a fast-charging standard developed by the USB-IF organization. The following three obvious strong advantages are enough to become Apple's reasons for choosing it.

• The charging speed is awesome - under the USB PD power transmission protocol, it can be expanded to an output voltage of 20V and an output current of 5A, which means that the current transmission can be as high as 100W. The battery life problem is already an urgent problem for mobile phone manufacturers to solve. Now that it cannot be solved by upgrading the battery, for the time being, increasing the charging speed is a good shortcut. The charging speed supported by PD fast charging is currently very good, although the terminal device And technology have not yet reached the high power of 100W, it can be seen that there is considerable room for improvement.
• Unified and user-friendly - The PD standard can support multiple voltages such as 5V, 9V, 12V, 15V, 20V, etc., and can intelligently match the voltage according to the needs of different devices such as mobile phones, tablets, and notebooks. In other words, all digital devices such as mobile phones, tablets, and notebooks can use one charger, which undoubtedly greatly facilitates the daily use of users. Think about it in the future as long as you bring a PD fast charger, you can charge iPhone XS, iPad Pro, and Macbook, is it too much convenient? This is also foreseeable by Apple.
• The unification of PD fast charging is an industry trend - According to statistics, as of March 2018, there are as many as 1,020 members of the USB-IF organization, and as many as 20 models have adopted PD fast charging on the market. In addition to Apple mobile phones, many mainstream brand mobile phones such as Huawei, Samsung, Xiaomi, Nokia, Hammer, Sony, Meizu, Razer, etc, have also incorporated the PD fast charging protocol into the charging configuration of the mobile phone. It is believed that driven by the Apple mobile phone as one of the mobile phone industry's vane, more branded mobile phones will support PD fast charging in the future, and the unification of PD fast charging is undoubtedly the industry trend.

Do you have any other questions about PD fast charger? Welcome to leave a message and discuss together~