Type-C fast charge

With the advancement of society, mobile phones are used more and more frequently. Everyone should have the experience of [charging is very slow]. Most of them are not familiar with the charging and discharging of electronic products, and the current and wattage issues, resulting in many random purchases on the road. No-name charging heads or cables charge very slowly because they use bad cores and the power is not enough.

In the early days of Android mobile phone charging cables, one end used a large-end USB, and the other end was thin and flat with a trapezoidal fool-proof device Micro USB; it gradually changed to USB to Type-C, and now it is directly replaced by a Type-C cable. -C to Type-C.

As for the Apple mobile phone charging cable, the USB to 30pin with a large head was used in the early days, and then the USB to Lightning was used, and now it is Type-C to Lightning, but the European Union has mandated that the standard be unified into Type-C to Type-C in the future.

The common mobile phone fast charging technologies on the market are simply divided into two types: PD fast charging and QC fast charging.

The PD fast charge that is most commonly heard at this stage is developed by the USB-IF Association [USB Implementers Forum, Inc.]. Developed by Qualcomm, the brand with the highest market share of smartphone processors.

Compared with the current version and power: [PD 3.0] 10-100W; [QC 4+] 27W.

If you want to charge quickly, the Type-C specification is already the current trend, and because of the internal core wire design, it is divided into various wattages, and it supports [USB Power Delivery (USB PD for short)].

Usually the output power must reach more than 18W (9V/2A or 15V/1.2A or more) to be called PD.
Power (in W) = voltage (in V) x current (in A), for example: 15V x 1.2A = 18W.

In the past, the maximum power supply of USB was 2.5W for USB 2.0, 4.5W for USB 3.0, and 7.5W for battery charging standard USB BC (Battery Charging) 1.2.

PD is mainly a USB (Universal Serial Bus) cable, a USB power supply expansion standard that can supply and receive power up to 100W. Therefore, devices such as tablet computers and notebook computers that cannot be supported in the past can also supply and receive power, and the supported devices have been greatly expanded.

In terms of mobile phone fast charging, it has its own protection mechanism. At present, the latest flagship phone has a maximum of 20W, that is, no matter what kind of fast charging technology you use, no matter how high the wattage flow is, the fastest speed is 20W.

Plug-in fast charging starts from 0% and accelerates to the charging speed between 70%. After 70%, the current will be reduced to "trickle charging". This is to protect the battery on the one hand, and on the other hand to improve the safety of charging. sex.

In conventional USB connectors, it is necessary to distinguish between Type-A on the host side and Type-B on the device side, but Type-C does not need to distinguish between the host side and the device side.

In addition, Type-B connectors have various shapes other than the usual B, such as Mini-B and Micro-B. It is necessary to prepare a connector cable corresponding to the device, but Type-C is unified into one shape and one cable It can support all devices with Type-C terminals.

And there is no positive or negative, so there is no need to distinguish the direction of the fool-proof insertion, and it can also process video signals, so only the USB terminal can be used for data transmission, power supply and power reception, and video signal transmission.