Quick Charge Technology: Introducing USB Power Delivery and Quick Charge
Technology products such as mobile phones and computers are becoming more and more powerful, and the screen area is getting larger and larger, and the associated power consumption is also gradually increasing. How to achieve fast charging is a topic of concern to users. However, in user experience, the following phenomena have become difficult problems for consumers:
My mobile phone has fast charging function, but why is the charging speed still very slow?Is there a hidden danger to the safety of fast charging? The charge exploded into panic.Swipe the phone while charging, and the phone heats up, causing panic? !
The quality of products on the market is uneven. If consumers use chargers that do not meet the specifications, or use chargers that do not meet the standards, or use low-quality wires, the mobile phone will not only be unable to realize the fast charging function, but will also cause safety hazards. Hidden danger. How much do you know about fast charging?
Fast charging principle:
In electricity, the voltage (volt, V) multiplied by the current (ampere, A) can get the power (watt, W). The higher the charging wattage, the shorter the time required for charging. The current fast charging technology can be realized in the following three ways:
High voltage low current mode: boost voltage, increase charging powerLow-voltage high-current mode: increase current and enhance charging powerHigh-voltage high-current mode: boost voltage, increase current
To put it simply, fast charging is to effectively increase the charging speed of products and shorten the charging time within a safe load range. Currently hotly discussed fast charging technologies on the market include Quick Charge (QC) launched by Qualcomm and USB Power Delivery (PD) defined by the USB Developers Forum.
What is USB Power Delivery?USB Power Delivery (USB PD) is a USB power supply extension standard that can support up to 100W power supply and reception by using a USB (Universal Serial Bus) cable. In the past, the maximum power supply power of USB was USB 2.0 (2.5W), USB 3.0 (4.5W), and BC 1.2 version (7.5W). Now it has jumped to 100W for power supply and reception. Therefore, devices that could not be supported in the past, such as notebook computers and tablets, are also Power supply and reception can be performed, and the supported equipment has been greatly expanded.
USB PD uses a USB Type-C® connector, which can provide power while transferring data through USB in the past, covering mobile phones, cameras, charging treasures, tablets, notebook computers, monitors, etc., and charging and data transmission can be easily done with one cable. Also supports Alternate Mote mode, which can handle video signals. Data transmission, power supply and power reception, and video signal transmission can be performed using a single USB port, thereby creating a simple and convenient environment.
USB Power Delivery (USB PD) technologyThe setting of power supply capability in the USB Power Delivery (USB PD) 1.0 specification is divided into five levels (Profile 1~5):
Profile 1 (Provide 5V@2A, 10W power supply; applicable to various portable devices such as mobile phones)Profile 2 (provide 5V@2A, [email protected], 10~18W power supply; suitable for tablet PC or external storage device)Profile 3 (provides 5V@2A, 12V@3A 36W power supply; suitable for ultra-extreme notebooks and other devices)Profile 4 (provides 5V@2A, 12/20V@3A 60W power supply; the maximum power supply specification supported by microUSB, suitable for All in One computers)Profile 5 (provides 5V@2A, 12V@5A, 20V@5A 100W power supply; for standard A/B and USB Type-C® connectors, suitable for LCD monitors and flat-panel TVs)USB PD 1.0 supports four voltages 5V, 9V, 15V, 20V, up to 100W, and is backward compatible with USB 3.2/2.0, BC 1.2/1.1/1.0, and has 5 profiles. USB PD 2.0 can use Type-A, Type-B and Type-C interfaces. When it comes to USB PD 3.0, only the USB Type-C® interface can be used, and PPS (Programmable Power Supply) is added.
What is QC fast charging?Quick Charge™ (QC) is a fast charging technology developed by Qualcomm (Qualcomm). As long as there are Android phones equipped with its Snapdragon system chip, it can use its fast charging technology. In addition to supporting a variety of mobile phones with Snapdragon processors, it also supports some processors from other brands. The historical versions of QC fast charging technology are as follows: QC 1.0 supports from 10W; QC 2.0 supports from 15W; QC 3.0 supports from 18W; QC 3+ supports from 18W; QC 4 supports from 18W (A)/27W (B); 4+ supports 18W (A)/27W (B); QC 5 supports 45W.
In 2020, Qualcomm (Qualcomm) launched the commercial fast charging technology Quick Charge™ 5 (QC 5), which can support fast charging chips with a charging power greater than 100W for Android smartphones. Its efficiency is 70% higher than that of the previous generation, and the charging speed is 4 times faster. It can charge the device from 0% to 50% in 5 minutes. The transmission efficiency ensures charging safety and prolongs the life of the device battery.
In addition, QC 5 is not only compatible with the previous QC 4+, QC 4, QC 3 and QC 2, but also continues QC4, which can also be applied to USB-PD and Type-C technologies, and is compatible with USB Type- C protocol and other industry standards, so it can be extended to other devices.
