Recently, the USB-IF Association released the latest USB PD3.1 fast charging standard, the charging power has been increased from the original 100W to 240W, and supports a maximum voltage output of 48V, which has attracted widespread attention in the industry and caused heated discussions.
Literally, USB PD3.1 can only be regarded as a small version update of USB PD3.0, but in terms of power, this is a qualitative leap. What are the differences between USB PD3.1 and previous versions? Today, the editor of the charging head network will come to tell you about it.
USB PD2.0
The USB PD2.0 fast charging standard was released in August 2014, which not only stipulates the USB Type-C interface as the only standard interface, but also gives this interface more functions, such as charging, data transmission, audio transmission, etc. In terms of charging, USB PD2.0 defines support for 5V3A, 9V3A, 12V3A, 15V3A, 20V5A output, and the maximum charging power reaches 100W.
However, it was still the era when the Micro USB interface was popular, and the mobile phone market had basically been divided up by private fast charging protocols such as QC, AFC, FCP, and PE, and it was difficult to popularize USB PD fast charging. This situation continued until 2015, when Apple released the industry's first New MacBook equipped with the USB PD2.0 fast charging standard, and USB PD fast charging officially opened the road to popularization in the field of consumer power supplies.
USB PD3.0
In November 2015, USB PD fast charging ushered in a major version update, entering the era of USB PD3.0 fast charging. Compared with USB PD2.0, USB PD3.0 has three main changes: a more detailed description of the characteristics of the built-in battery of the device is added; the function of device software and hardware version identification and software update through PD communication is added, and the digital Certificate and digital signature functions.
To put it simply, in terms of charging parameters, USB PD3.0 and USB PD2.0 have not changed, and still support 5V3A, 9V3A, 12V3A, 15V3A, 20V5A output, and the maximum power is 100W. However, this update has not improved the chaotic situation of fast charging standards in the mobile phone market. Fast charging standards are still separate and incompatible with each other.
USB PD3.0 PPS
In order to change the situation of splitting the fast charging protocol in the mobile phone market, the USB-IF Association released an important update of the USB PD3.0 standard in February 2017, adding a programmable power supply PPS on the basis of the USB PD3.0 standard.
PPS is a type of Power Supply supported in USB PD3.0, and is a power supply that uses the USB PD protocol to output voltage and current regulation. The PPS specification integrates the current two charging modes of high voltage and low current and low voltage and high current. The voltage amplitude modulation drop is also 20mV, which is only one-tenth of the QC3.0 standard at that time, and the adjustment is more accurate.
And the USB-IF Association has also reached a consensus with Thiel Labs, aiming to unify the fast charging technology for the PPS fast charging standard. At present, PPS fast charging has become a fast charging standard with a very high share of the Android mobile phone camp. With the built-in charge pump of the mobile phone, high-efficiency and high-power fast charging can be achieved. Xiaomi, Samsung, Meizu and other brands of models are used.
USB PD3.1
USB PD3.1 is the fast charging standard just released by the USB-IF Association. The USB PD3.1 fast charging standard is actually an update based on the USB PD3.0 PPS fast charging.
The USB PD3.1 fast charging specification divides power into two ranges: Standard Power Range (SPR) and Extended Power Range (EPR). Among them, the standard power range is the current mainstream USB PD3.0 PPS fast charging standard on the market, and the maximum charging power remains unchanged at 100W; while the newly added three voltages of 28V, 36V, and 48V belong to the extended power range, and the three voltages correspond to The maximum output current is 5A, and the maximum output power can reach 240W.
In addition to adding three sets of fixed voltages, the USB PD3.1 standard also adds three sets of adjustable voltage files (AVS for short) in the expanded power range, which are 15V-28V 5A, 15V-36V 5A and 15V-48V 5A . The minimum voltage regulation step of AVS is 0.1V, and the constant power limit mode based on PDP continues to be used.
Summary of charging head network
It has been nearly ten years since the development of the USB PD fast charging standard, and many iconic iterations have been experienced during this period. Among them, USB PD2.0 is a fast charging standard for real mass production and commercial use, and it also lays the foundation for the realization of USB PD fast charging. USB PD3.0 is more updated in terms of protocol identification function, and the charging specifications have not changed.
The USB PD3.0 PPS fast charging standard has added a programmable voltage level, which is compatible with most private fast charging protocols, and has become the most widely used fast charging standard in the Android mobile phone market.
USB PD3.1 is mainly to expand the scope of application of the USB PD fast charging standard. In addition to consumer products such as mobile phones and laptops, it can also be used in displays, servers, power tools, security POE power supply and other fields, realizing "everything can be charged" "Vision.
Post time: Jul-13-2022