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Everywhere we look today, we see USB being used to charge smartphones, digital still cameras, and similar devices. In the previous era, until about ten years ago, keeping one’s devices charged was a tricky and cumbersome endeavor. Most devices came with their own dedicated AC adapters. These bulky “power bricks” could be very different from one another, utilizing different connectors and wiring, and requiring different power levels. It was difficult, if not impossible, to use a single adapter for multiple devices. Users were often searching for misplaced adapters or trying to select the correct one from a large disordered assortment. To prepare for a business trip, you needed to arrange and pack multiple, often heavy adapters—one for each portable device you carried.
Things changed rapidly with the appearance of USB interface. This new serial interface was also capable of delivering power, hence it quickly became the power-supply solution for a wide range of digital devices. Smaller devices, particularly smartphones and small digital still cameras, were now charged through USB adapters. This is because a single adapter could be used with many different devices - it is no longer necessary to carefully store and select among different adapters.
One of the downsides of USB is the relatively limited amount of power that can be transmitted through the cables. USB 2.0 only allowed for a 500 mA load if the device is also transmitting data, while USB 3.0 set the upper limit at 900 mA. Both standards can handle up to 1.5 amps strictly for charging purposes, but not while data is being transmitted. This puts a sharp upper limit on the types of devices that can be powered off USB 3.0 ports — or, at least it used to.
100w Usb-c Power Adapter
Now, Renesas has demoed the first example of the USB Power Delivery standard, which it hopes to begin commercializing next year. The company has demoed an FPGA version of a USB 3.0 hub powering a system board and hard drive. The drive in question was a standard desktop 3.5-inch drive, which typically draws more current than a standard USB port can provide while maintaining data transfer.
USB Power Delivery (PD), when finalized, will provide up to 100W power at 20V — more than enough to power monitors, external graphics cards, drive arrays, and other hardware without independent power cables and AC adapters. More than that, however, the spec is designed to provide a more flexible solution for moving power between devices. Power can flow in either direction — a laptop could, for example, be powered directly by its external display. USB PD allows devices to adjust their own power consumption — a compatible device might charge at one rate, drop down to a lower charge rate while transmitting data, and then step back up to full, flawlessly.
The hubs are also designed to be flexible at the port level, meaning you can plug a variety of devices into the system without worrying about one product burning out the rest of the devices. Hook up a laptop and an iPhone, in other words, and your iPhone won’t get zapped by the laptop’s far higher power draw. The idea is to create a flexible standard for future USB devices, in which USB can power virtually anything from virtually any source.
The wandering earth film. And according to a recent update from the Copyright Administration, this has paid off.“All the infringement and piracy reports received through Weibo, WeChat, email, and other channels will be sorted out and handed over to the relevant copyright law enforcement agencies. We hope that the majority of users continue to provide relevant clues,” NCAC wrote.This will sound like music to the ears of the International Intellectual Property Alliance (IIPA), a trade group that also represents Hollywood’s interest.
Usb C Pd Wall Charger
USB PD will be included in USB 3.1, which means it should debut along with the new (reversible!) connector style and with full backwards compatibility with older devices. While current chips are being emulated in FPGA, we could see shipping silicon by 2015. Much depends on how quickly motherboard manufacturers move to offer the technology — it’ll be several years before we see the function integrated at the chipset level by the likes of Intel or AMD.
Usb Power Rating
Update: An earlier version of this story claimed this was the first demo of USB PD technology. The first demo boards for USB PD were actually built by Obsidian Technology, which has shipped early test boards to multiple customers.
Now read: How USB charging works, or how to avoid blowing up your smartphone
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