How To Prevent Cell Phone Charging On Usb Port
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The tech world has finally coalesced around a charging standard, later on years of proprietary adapters and ugly wall wart power supplies. Well, sort of.
en years ago, you always had to make certain you had the right power supply for each of your gadgets. Usually, that power supply wasn't even labeled. Today, you can charge your phone at your friend's house, plug your ebook reader into any figurer, and download photos from a digital camera directly to your TV, all thanks to a standardized connector. In its place, though, there's a new problem: USB ability. Not all USB chargers, connectors, and cables are born equal. You've probably noticed that some wall chargers are stronger than others. Sometimes, one USB socket on a laptop is seemingly more powerful than the other. On some desktop PCs, even when they're turned off, y'all can charge your smartphone via a USB socket. It turns out in that location'due south a method to all this madness — but beginning we take to explain how USB power really works.
In that location are now four USB specifications — USB ane.0, 2.0, three.0, and 3.1 — in addition to the new USB-C connector. Nosotros'll bespeak out where they significantly differ, but for the almost part, we'll focus on USB 3.0, as it's the most common. The other important fact is that in any USB network, there is i host and ane device. In almost every instance, your PC is the host, and your smartphone, tablet, or camera is the device. Power always flows from the host to the device, but data can flow in both directions.
Okay, now the numbers. A regular USB i.0 or two.0 socket has 4 pins, and a USB cable has four wires. The inside pins conduct information (D+ and D-), and the outside pins provide a 5-volt power supply. USB 3.0 ports add an additional row of v pins, then USB 3.0-compatible cables have ix wires. In terms of actual current (milliamps or mA), at that place are 3 kinds of USB port dictated by the electric current specs: a standard downstream port, a charging downstream port, and a dedicated charging port. The showtime two can exist found on your calculator (and should be labeled as such), and the third kind applies to "dumb" wall chargers.
USB-C is a different connector entirely. First, it's universal; y'all tin can put it in either style and it will work, unlike with USB. It's as well capable of twice the theoretical throughput of USB iii.0, and can output more ability. Apple joined USB-C with USB 3.1 on its new MacBook, and Google included it on the new Chromebook Pixel. We're also starting to run into information technology on phones, with the start being the OnePlus 2. Only there can too exist older-style USB ports that support the 3.1 standard.
The USB spec also allows for a "sleep-and-charge" port, which is where the USB ports on a powered-downward calculator remain agile. You may have noticed this on your desktop PC, where in that location's always some ability flowing through the motherboard, but some laptops are also capable of sleep-and-charge.
How To Prevent Cell Phone Charging On Usb Port,
Source: http://www.afenet.net/index.php/world/43-tech/electronics/140-how-usb-charging-works-or-how-to-avoid-blowing-up-your-smartphone
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