On May 28, 2021, the Telecommunications Terminal Industry Association released the converged fast charging standard "Technical Specifications for Converged Fast Charging of Mobile Terminals." This standard aims to solve the complex and changeable and incompatible problems of the current fast charging standards on the market, and it also plays a positive role in improving the user experience, energy conservation and environmental protection.
The full name of the UFCS fast charging specification is Universal Fast Charging Specification. The standard is led by the Green Energy Working Group (WG10), led by the Institute of Information and Communications Technology, Huawei, OPPO, vivo, and Xiaomi, and has been honored by Honor, Silicon Power, Rockchip, and Lihui Technology , Angbao Electronics, Dianku Network and many other terminal, chip companies and industry partners strongly support.
It is worth mentioning that during the development of the UFCS fast charging standard, head manufacturers such as Huawei, OPPO, vivo, and Xiaomi have broken the inherent technical standards and made great contributions to the formulation of a unified technical standard for fast charging of mobile terminals. At the same time, thanks to the joint efforts of these leading manufacturers, the UFCS fast charging standard can meet the needs of the long-term development of fast charging ecology.
According to the content of the UFCS fast charge specification, the standard adopts a continuous adjustment mode, and the output voltage is divided into four programmable gears of 5V, 10V, 20V, and 30V (similar to USB PD3.0 PPS voltage regulation), of which the 5V gear can be The programming voltage range is 3.4V-5.5V, the programmable voltage range of the 10V gear is 5.5V-12V, the programmable voltage range of the 20V gear is 12V-21V, and the programmable voltage range of the 30V voltage is 21V-36V.
In addition to clearly stipulating the output power of the power supply equipment, the UFCS fast charging standard also stipulates that the power supply equipment and the charging equipment jointly complete the acquisition of cable electronic label information, and force the charging equipment to increase the cable impedance detection function.
When the current is greater than 6.5A, the UFCS cable electronic label needs to be added; when 4A<path current≤6.5A, it is recommended to add the UFCS cable electronic label, which can also support other cable identification schemes; when the cable current is less than or equal to 4A , No need to identify the cable, use the cable impedance to match the current capacity of the cable.
Since 2014, domestic fast charging technology has developed rapidly, and it has been at the international leading level in terms of charging speed and charging safety; the fast charging experience has been widely recognized by market users and has become a standard feature of mobile phones.
However, due to the long-standing problem of protocol incompatibility in the fast charging industry, especially among major mobile phone brands, there are many fast charging protocols and are incompatible with each other, and mobile phones of different brands and chargers can only achieve basic low-power charging. . This not only seriously affects the user's fast charging experience and wastes resources; it also greatly increases the risks and costs of R&D in the upstream and downstream of the industry chain.
The vision of the UFCS fast charging specification is to change the incompatibility of various charging protocols, and to become the universal fast charging standard in the fast charging industry, and to realize the unification of the fast charging market.