Fast charging has now become the highlight of all major brands of mobile phones, but although they are all fast charging, there are many fast charging agreements in the current market. In fact, the so-called final agreement is still difficult. At present, the most likely to have the opportunity to unify the rivers and lakes should be The USB PD protocol led by the USB Association, with the improvement of the PD protocol, its biggest role is to finally unify the various charging protocols in the digital world. With the rapid popularity of USB PD, major manufacturers such as Huawei, Apple, and Samsung have begun to support the USB PD protocol. The USB-IF (USB Implementers Forum) published the first version of the USB Power Delivery Specification Revision in 2012. 1.0, Version 1.0), its specifications greatly increase the power supply capacity to a maximum of 100W (20V 5A). With the addition of more functions, the specification is constantly updated, and now it has come to USB Power Delivery Specification Revision 3.0
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Speaking of the USB-PD protocol, the full name USB Power Delivery may be unfamiliar to many people, but more and more mobile phones have begun to support this protocol and used it as a fast charging function for devices.
Someone with a little understanding may think that the charger output of the USB-PD protocol is output in Type-C, which is different from our common USB-A interface output, but this cannot be simply used to judge whether the USB-PD protocol is supported. The charger that has Type-C output is not necessarily the charger that supports USB-PD protocol; the charger that supports USB-PD protocol must have Type-C output. The picture about why the charger supporting the USB-PD protocol should use the Type-C interface as the output, because USB Type-C has new features that our common USB-A interface does not have, such as: support for positive and negative insertion, support Stronger power transmission (maximum power 100W), faster transmission speed (up to 10Gbps), etc. This is the reason why more and more Android phones and Apple Macbooks are beginning to use the Type-C interface. As for the USB-PD fast charging protocol, undoubtedly the most important feature of using it as an output interface is the maximum power of 100W. Although USB-A under USB3.1 can also do it, the size is too large. Relatively speaking, Type The -C interface has become the mainstream of the times. In today's electronic devices are becoming thinner and lighter, the best choice. According to the power available, the USB PD sets the five-level specifications of 10W, 18W, 36W, 60W, and 100W. According to the USB-IF specification, the Type-C connector supports 100W (20V, 5A) power supply, and the USB PD standard can support a maximum charging power of 100W. The USB interface can supply power to devices such as laptops or monitors. Many people may think about the USB-PD protocol and the previous PE+ of MTK, QC 4+ of Qualcomm, VOOC (DASH) of OPPO, FCP of Huawei (QC 2.0 in vest), SCP, and so on. What is the difference between fast charging technology, and it is wrong to have such an idea. What needs to be understood is that for the time being, we can think that these stray protocols are a subset of the USB-PD protocol, and the reason why USB-PD The large-scale support for devices is now because he unified the standards, so that in the future, when charging digital electronic devices, you do not need to use the manufacturer's "exclusive" charging equipment to quickly charge the devices, unifying all low-power electronic device interfaces , Let us be more convenient when charging the first device in the future. Picture
Just like Jobs’ philosophy: "Always think that users are stupid."
When selecting a transformer, we only need to consider whether its power can reach the maximum power of the equipment to be charged. At present, through the operation of the USB Association, basically all mobile phones are charged through the USB interface. USB PD 3.0 does not allow the USB interface to adjust the voltage through a non-USB PD protocol. If the current and voltage cannot be adjusted in coordination, the fast speed cannot be achieved. Charging, so most of the fast charging has to add support for USB PD obediently.
In addition, Google emphasized in the latest Android 7.0 OEM specifications: mobile phones using USB interfaces, fast charging technology must support USB PD.
Software and hardware are limited at the same time, leaving little room for other fast charging standards. At present, USB PD has incorporated many fast charging standards, including Qualcomm QC 4.0.
In this way, it seems that USB-PD does have a pretty good slogan and philosophy, and we all know that good ideas and changes require a strong appeal in the industry to turn ideas into reality; if Without a strong appeal, I'm afraid it can only be lip service, and only daydreaming in exchange, but the USB Association obviously has this strength, what do you think?