December 12, 2017, "Tell Forum 2017 Fast Charge Technology Standards and Applications Seminar" held in Dongguan Songshan Lake Guangda Weigu formally convened by the China Institute of Information and Communication Technology, Terminal Terminal Laboratory hosted at the meeting brought China's first fast charge standard "rapid charge terminal communications technology requirements and test methods."
Speaker: Xu Chunying, Senior Engineer, Environment and Safety Department, Tel'Terminal Laboratory. She is the project leader and the main drafters of the standard. The topic of the speech is: Interpretation of "Fast Charge Technology Requirements and Test Methods for Communication Terminals" by China Fast Charge Standard.
This standard lasted for three years, experienced three draft third trial, clear what is fast charge, support five kinds of represent fast charge agreement.
The speech consists of five parts: a brief history of fast charge, fast charge standard setting, standard body content, standard protocol content, prospect and exploration.
The first part tells a brief history of fast charge. It mainly introduces the meaning of fast charge and what are the historical problems of fast charge application.
The meaning of fast charge is that the application of mobile communication terminals is more and more widely used, the frequency of use is higher and higher, the overall power consumption is increasing, the life time can not reach the expectation of consumers, and frequent charging is required, but according to the current charging standard , Charging a longer time, can no longer meet the requirements of consumers.
In the unit volume of battery capacity technology is difficult to break the premise, although not a fundamental solution to rapid battery charging bottlenecks mobile phone problems, but its practicality, to meet consumer demand for using a shorter time to charge.
The history of fast charge applications are: security issues, overheating, burning mouth, crashes, motherboard burning, fire, explosion; compatibility issues, scalability and continuity, patent issues.
Standards development workflow: project, drafting, soliciting opinions, submitting for trial, submitting for approval, implementing, reviewing and abolishing.Experienced the third draft system of third instance, draft refers to standard draft draft for approval, standard draft draft for approval and draft standard draft for approval .
Fast-charge standard development process lasted three years, in June 2014 through the approval, in September 2017 formally submitted for approval, has now been approved.
Standard text content, definitions of terms.
Fast charging mode: A charging system consisting of an adapter, a cable and a terminal starting from the initial charging state until the battery is charged for 30 minutes with an average current greater than or equal to 3A or a total charge of 60% or more of the rated capacity of the battery charging method.
Normal Charging Mode: Adapter rated output voltage of 5V, rated output current is less than or equal to 3A charging mode, in this mode adapter output port D + and D- short circuit.
Fast charge type includes two types: ⅠType fast charge mode and type Ⅱ fast charge mode.
The former is a charging mode that increases the terminal charging power and rate by increasing the output voltage of the adapter, which is a charging mode that increases the terminal charging power and rate by increasing the adapter output current.
During fast charging, Type I and Type II can be selected at the initial stage or switched during charging, depending on the protocol.
Overall connection structure - Three-stage: fast charging power adapter, cable, fast charging mobile terminal (including battery).
Hardware Testing: Adapters, Cables, Terminals, Batteries.
Adapter electrical performance requirements: Input voltage, current and frequency adaptation range; output voltage adaptation range; output voltage ripple; current inrush current; contact current; interface short circuit protection; energy efficiency requirements; D + and D- output voltage limits. Change requirements.
Identification and description: battery identification, charger and terminal identification, terminal manual.
Standard agreement content, There are five types of protocols, including A, B, C, D and E, of which two are for free use and three are for fair and non-discriminatory use. A is Qualcomm, B is Huawei Fast Charge Protocol, and C is USB PD Agreement, D agreement is MTK agreement, E agreement is VOOC flash charge.
Protocol Scope - Adapter side, depending on the interface type, the USB-A interface should support one or more of Fast Charge Protocol A, B, D, E, USB-C interface should support the C protocol.
Protocol Scope - On the terminal side, the Micro-B interface shall support one or more protocols of A, B, D and E, depending on the interface type. The USB-C interface is used in two cases with the USB-C interface adapter , The C protocol should be supported. When used with a USB-A interface adapter, one or more of the protocols A, B, D, and E should be supported.
Charging head network also learned that the difference between C protocol and USB PD protocol: 27-45W stalls, USB PD protocol limit to use 15V, and C standard is not limited; 45-100 W stalls, USB PD limit to 15V and 20V C standard also not limited.
Finally, on the implementation of the standard landing, you need to define the test scenarios and cases, build a system test platform.Xu Chunying also said that the industry must also be concerted, work together.
