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While looking at various electronic devices, you may have seen the term “fast charging”. What does this have to do with PD 3.0 or QC 3.0? In a word, nothing. It’s simply a measurement of how fast a battery can charge. In general, a standard 1 amp charger charges at 5 watts, which is ordinary USB. Conversely, fast charging batteries can charge at 12 watts or higher. Fresco Logic to demonstrate the Industry's First USB-C PD3.0 Programmable Power Supply (PPS) Total Solution". Archived from the original on 28 February 2018 . Retrieved 25 February 2018. Numerous portable electronics, such as cell phones, tablets, portable speakers, and other handheld devices, now use USB as a power source. To perform "traditional" USB functions, users require a USB to satisfy their data needs and power or charge the devices easily and frequently without the need to load a driver.
However, this issue of compatibility is about to be a thing of the past with the introduction of the USB Power Delivery Specification. USB Power Delivery (or PD, for short) is a single charging standard that can be used all across USB devices. Normally, each device charged by USB will have their own separate adapter, but not anymore. One universal USB PD will be able to power a wide variety of different devices. USB 3.2 products: USB 3.0 Adopters Agreement, USB 2.0 Adopters Agreement plus the “USB Power Delivery Specification” Adopters Agreement As shown in Figure 1, the first stage of charging a single cell lithium-ion battery is to apply constant current—0.5 to 1.0 Coulomb—until the battery voltage reaches 4.2V per cell. Once the battery voltage reaches 4.2V, the battery enters the second state of charging, called saturation charging, where a constant voltage of 4.2V is maintained while the charging current drops over time to less than 10% of the initial charge rate. USB PD3.0 (Power Delivery 3.0 ) is a power supply standard based on the USB Type-C interface. The maximum power supply can reach 100 W (watts). The connectors at both ends of the PD 3.0 compliant cable must be Type-C, which means that PD3.0 will not be applied to the common USB-A cable we used before, but only USB-C to USB-C Cable; With the popularity of the USB Type-C interface, more and more devices have begun to use the USB PD fast charging solution. For example: mobile phones, tablets, monitors, chargers, even lamps, electronic scales, small appliances, toys, etc. In addition to passing USB-IF compliance testing and inclusion of its Power Delivery products on the Integrators List, companies wishing to use the certified USB logos must have a current on file USB-IF Trademark License Agreement. USB Power Delivery is covered by the relevant adopters agreements for either USB 2.0, USB 3.0, or USB4 ™ depending on the specification implemented. Recommendations for which adopters agreements are appropriate to execute are listed below:efficiently. Get One of These Two RAVPower PPS Fast Chargers 1. PD Pioneer 20W Wall Adapter (RP-PC150)
Another great feature of USB PD is the fact that the power direction is no longer fixed. In the past, if you plugged your phone into the computer, it would charge your phone. But with Power Delivery, the phone you plug in could be responsible for powering your hard drive.
What is PD 3.0?
Standard USB power specifications don't offer much in the way of power. There are various USB power standards that devices can call on. Which ones are available depends on what type of USB standard the controller, cable, and device all support. For example, USB 3.2 Gen x2 offers at most 7.5W while USB 3.0 offers 4.5W. Standards-Based Charging: For years, the USB Implementer’ Forum (USB-IF), which oversees the USB standard, has been working to globally standardize around USB for charging. The International Electro-Technical Commission (IEC) has long since formally adopted USB, and more recently, USB Type-C and PD. The Transport Interface specification defines a communication protocol for use over I2C or other peripheral interfaces. It uses the structure defined in Chapter 9 of the USB Power Delivery Specification and extends it for use on other buses. In the way of a simple example, this specification enables a standardized communication protocol between a USB Power Delivery Controller and a Device / System Policy Management Controller as well as control over power management peripherals such as a DC-DC converter. It allows for autonomous device operation when no System Policy Managers are present, or slave operation when a USB Host Controller is the System Policy Manager. Questions? When operating in constant voltage (CV) mode, the source strives to maintain a constant voltage output across V BUS, even as the V BUS load current changes. However, the V BUS load current must also remain within the operating current requested in programmable RDO. If the V BUS load current increases beyond the requested operating current, the source switches to constant current (CC) mode.
Sources say that it's best to use USB PD 2.0 for simple devices that don't necessarily need extra or in depth information presented. One should use USB PD 3.0 if the new features are required in your device's application. As you can see, PD 3.0 and QC 3.0 are similar, but remain distinct. They’re fundamentally different technologies. Which one is better? It really depends on your device. In theory, QC 3.0 is best for smartphones. By providing the exact voltage required, it allows you to maximize your battery’s performance. That said, it’s proprietary. Only certain Android phones currently support the technology. Unless you’re using one of these devices, you won’t be able to take advantage of QC charging. On the other hand, most modern smartphones support PD charging. These include all Apple phones starting with the iPhone 8. Apple says the MagSafe charger will charge with any adapter greater than 12W, but at a reduced rate. Tests show around 10W or less when used with adapters below 20W. When the MagSafe charger negotiates for power it specifically looks for the 9V x 2.22A supply, which is only present in 20W PD 3.0 adapters — and only some with a greater power potential, given that it specifically needs that 9V x 2.22A supply. This is why it defaults to 5V x 2A when using the 18W adapter, and will do the same with most — but not all — existing 60W USB-C power adapters, resulting in slower charge speeds. When it comes to tech, the general consensus is that smaller is better. This RAVPower charger with PPS fast charging is small in stature but big in performance. It was specifically designed for the iPhone 12 series and offers a total output of 20W. Well, yes… and no. In a broad sense, you’d be correct. Both PD 3.0 and QC 3.0 will charge your battery faster than traditional USB. At the same time, there are important differences between the two. Depending on your phone, one or the other can be a significantly better choice. In fact, many phones support PD 3.0 but not QC 3.0, or vice-versa. So, what’s the difference? Let’s begin by talking about the basics of both technologies. Once we’ve done that, we’ll be well-equipped to discuss which one is better for your purposes.In addition to 100 watt power, there are four other wattage levels: 7.5, 15, 27, and 45 watts are all supported. Within each wattage level, there’s also support for various voltages. Just to use one example, in the 27-watt range, you can charge at 5, 9, or 15 volts. This makes the PD standard exceptionally versatile. Manufacturers can build a wide variety of devices, and still get top-tier performance. QC 3.0 Basics Sometimes you need a big power boost, not just a little, especially when there’s a power outage, and that’s where the RAVPower Power House comes in. If you want a charger that can power a laptop, tablet, smartphone and a console, this is it. You won’t have any problems charging your devices to full capacity multiple times. And we’re talking about mainstream devices here, like the MacBook Pro, the Samsung Galaxy S20 Ultra, and the iPhone 12 Pro Max.
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