Everything about Protocols of USB Fast Chargers -What are the Differences

Everything about Protocols of USB Fast Chargers -What are the Differences

USB fast chargers have become a significant part of our everyday lives as we rely heavily on our smartphones, tablets, and other electronic devices. However, one of the common problems that users face is the compatibility of USB fast chargers with their devices. This is because not all battery chargers are adaptable to every phone brand in the market. 

This is where the fast-charging protocols come into play. In this blog, we will discuss everything about the protocols of USB fast chargers, their differences, and how they affect charging speeds.

What is Fast Charging Protocol?

A USB fast charger is a device that allows you to charge your electronic devices at a much quicker rate than a standard charger. It delivers a higher current to the device, resulting in shorter charging times.

In the context of fast charging, a protocol refers to a set of rules and standards governing communication between the USB charger and the receiving device during the charging process. These protocols define the voltage, current, and other parameters required for fast charging. A fast-charging protocol aims to enable more rapid charging of electronic devices.

Different Types of USB Fast Charger Protocols

Not all USB fast charger protocols are created equal. These protocols vary in terms of their charging speeds, efficiency, and compatibility with different devices. Let's discuss different types and their features in detail.

  1. Public Fast Charging Protocols

Public fast-charging protocols are open-source, and anyone can use them. These protocols are developed by organizations like USB Implementers Forum (USB-IF) and are widely adopted by device manufacturers. The main advantage of public protocols is that they have wider compatibility with devices from different manufacturers. Some popular public fast-charging protocols include:

  1. USB Power Delivery (PD)

USB Power Delivery (PD) is a fast-charging protocol that is designed to work with devices that have a USB-C port. PD can provide up to 100W of power, making it suitable for charging laptops and other high-powered devices. One of the key features of PD is its bidirectional power, which means that it can provide power in both directions. Also, PD uses an adaptive charging algorithm that adjusts the voltage and current to provide the fastest charging speed for a particular device.

Several versions of the USB Power Delivery (PD) protocol are available, each with different capabilities and features. The most common PD protocols are;

USB PD 2.0: This was the first version of the PD protocol. It supports a maximum power output of 100W and includes voltage negotiation, current negotiation, and power direction negotiation features.

USB PD 3.0: This protocol version includes several new features, including Programmable Power Supply (PPS), Extended Message Support, and Fast Role Swap. It also supports a maximum power output of 100W.

USB PD 3.1: This is the latest version of the PD protocol and was released in 2020. It includes several new features, such as PPS for accessories, improved power management, and dynamic charging capabilities.

  1. Qualcomm Quick Charge

Qualcomm Quick Charge is a proprietary technology only available on devices using Qualcomm processors. QC is compatible with both USB-C ports and micro-USB cables. The protocols of this USB fast charger can deliver up to 27 watts of power. The latest version can supply up to 100 W. Quick Charge, which includes several safety features to protect devices from overcharging, overvoltage, and overheating.

Quick Charge 1.0: This was the first version of Quick Charge released in 2013. It provides up to 10W of power.

Quick Charge 2.0: This version of Quick Charge includes features such as voltage negotiation, current negotiation, and power direction negotiation.

Quick Charge 3.0: This version of Quick Charge provides up to 100W of power. It includes several new features, such as Intelligent Negotiation for Optimum Voltage (INOV), Dual Charge, and Battery Saver Technology.

Quick Charge 4.0: This version of Quick Charge delivers up to 100W of power. It includes features such as Intelligent Thermal Balancing, Advanced Safety Features, and Quick Charge 4+.

  1. Private Fast Charging Protocols

Private fast-charging protocols are proprietary technologies developed by individual companies. These technologies are often designed to work exclusively with specific devices or brands, and they are not open to the public.

However, they may not be as widely available as public protocols, and they may not work with other devices.

  1. Apple's Lightening Connector

One of the most popular private fast-charging protocols is Apple's Lightning connector. Apple devices use this technology, which is not available on other devices. The Lightning connector can provide up to 12W of power and is compatible with a range of Apple devices, including the iPhone, iPad, and iPod.

  1. Samsung's Adaptive Fast Charging (AFC)

Another popular private fast charging protocol is Samsung's Adaptive Fast Charging (AFC). This technology is used by Samsung devices and can provide up to 15W of power. AFC is designed to work with specific Samsung devices, including the Galaxy S and Note series. It has several versions, including AFC 1.0 and AFC 2.0. Each version provides different charging speeds and features.

  1. Oppo VOOC

Oppo VOOC is a fast-charger technology developed by Oppo. VOOC technology uses a special adapter and cable to provide up to 20W of power to the device being charged. The technology works by dividing the charging process into multiple steps, allowing faster charging times while reducing heat generation. VOOC technology is available on a range of Oppo smartphones and other devices that use Oppo's proprietary charging technology. Oppo VOOC has had several versions, including VOOC 1.0, VOOC 2.0, VOOC 3.0, and VOOC 4.0.

Ready to shop?

So, if you are looking for high-power solutions that best suits your preferences, you're at the right place. With a focus on innovation and quality, Huntkey is committed to providing users with high-performance and reliable USB fast charger solutions. You can buy the following products to benefit from USB fast charger protocols.

100W GaN Fast Charger (2C1A)

The Huntkey 100W GaN Fast Charger supports the USB Power Delivery (PD) protocol, a fast-charging protocol that allows for a maximum power output of 100W. It also supports the Programmable Power Supply (PPS) feature of the PD protocol, which allows for the charger to adjust the voltage and current output to optimize charging speed for the connected device.

65W Fast Charger (1C2A)

The 65W Fast Charger supports the USB Power Delivery (PD) 3.0 protocol, which is a fast charging protocol that allows for a maximum power output of up to 100W. PD 3.0 provides a range of improvements over previous versions of the PD protocol, including increased efficiency, faster charging speeds, and support for more advanced charging features.

Overall, the PD 3.0 protocol supported by the 65W Fast Charger provides a powerful and versatile charging solution that delivers fast and efficient charging speeds to various devices.


In conclusion, USB fast charger protocols have significantly improved the charging speed and efficiency of our devices. If you are looking for a 100W type-C charger or 65W GaN charger for upgrading your charging capabilities, connect with Huntkey. 

The renowned company offers advanced technologies like GaN and USB Power Delivery (PD) to deliver fast and efficient charging to various devices. Whether you need a fast charger for your smartphone, laptop, or other electronic devices, they have a variety of products to meet your needs.