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Facts | Do not burn if the phone while fast USB-charging?
By standardizing today virtually any device can be charged anywhere: at home, at a party or at work. And smart phones and tablets, and the players and many other devices are powered via USB, which has become a kind of standard. They are even used in wireless charging . Perhaps one of the few exceptions to the «USB-rule” remains connector Apple. But full compatibility is still not assured. The fact that not all USB-connectors, cables and chargers same. How to charge your phone and do not “burn” it?
The answer to this moving of many modern people, the question was an article Sebastian Anthony «How USB charging works, or how to avoid blowing up your smartphone» («How does the USB-charging, or how not to” burn “smartphone”), published resource ExtremeTech. Of course, this advice should be taken with extreme caution, as it does to any other technical recommendations. It is better to take it as information for consideration.
First of all, it should be understood that even wall USB-ports are of different capacity. Sometimes one of the USB-port of a laptop can be more powerful than the other. As for desktop computers, even when turned off, they sometimes allow to charge the smartphone via USB-port.
Let’s start with the fact that seemingly everyone knows: with information on how to operate the receiving power via USB.
At the moment, there are three specifications USB: USB 1.0, 2.0 and 3.0. We focus our attention on USB 2.0, as the most common of them. This will not forget the fact that versions 1.0 and 3.0 are essentially different. In USB-host network and has one single device. Most often, the host performs a personal computer, a device smartphone, tablet or camera. Electric power is always supplied from the host to the device, but the data may be transmitted in both directions.
And now it is time to technical details. USB-connector has four pins and four USB-cable wires. Internal pins (D + and D-) are used for data transmission, and the external pins are used for 5-volt power supply. Special adapters can block access to the internal pins to protect the device from malicious code, but allowing it to charge.
Current is measured in milliamperes (mA, mA). In this respect, there are three types of USB-ports: a standard port (standard downstream); charging port (charging downstream); special charging port (dedicated charging port). The first two types of USB-connector to stumble into your computer (they can be marked accordingly). As for the third type, then it is a wall-mounted USB-«outlets.”
Within the USB 1.0 specification and 2.0, the default port is capable of transmitting a current of 500 mA (0.5 A). In USB 3.0: 900 mA (0.9 A). Charging (the computer and wall) ports transmit a current of 1500 mA (1.5 A).
The USB specification also includes ports «sleep-and-charge», which remain active even when the computer is turned off. These ports are found not only on desktop computers, but also on some laptops. The presence of these ports means that some flow of energy always flows through the motherboard. We can say that the computer is “off off”.
It was said above that requires specification. The reality does not always fit into this framework, and much more diverse. For example, the battery charger Apple iPad 2,1-ampere (at 5 volts) charging Amazon Kindle Fire 1.8-ampere. Car chargers characterized amperage range from 1 A to 2.1 A.
Is it possible to “burn” a device for charging via USB
So, if you focus on the standard, not the reality, a normal USB 2.0 port holds a 500 milliamp current, and charge the special ports – up to 2100 mA.
What would happen if you connect a smartphone that focuses on the use of the 900 milliamp wall jack to USB-2100-amp charger on the iPad? “Burn out” if he is?
On this question there are two answers. The first, simple, concise and, consequently, inaccurate, no! Any USB-device via any USB-cable can be connected to any USB-port and does not “burn out”. Using a more powerful charger will only speed up the process of charging the battery. This only applies to modern devices.
There is a more extensive answer an important role in this age plays a specific device. This will determine the permissible speed charging device and the admissibility of charging from the mains. In 2007, at the conference USB Implementers Forum adopted Charging Specification («Specification charging”), which standardizes the method for charging USB-devices, regardless of whether they are connected to the USB-port of a PC with a high amperage, or to a wall power supply. It was only after the adoption of the standard began to appear on the market devices that correspond to it.
Thus, almost any modern USB-device (smartphone, tablet, e-book or camera) can be charged from a high-current USB-ports and high amperage will only hasten the process of charging.
Much more difficult with older devices. It is possible that the Battery Charging Specification them “not familiar” and they only support the old-fashioned 500 Milliamp PC ports USB 1.0 and 2.0. Some USB-devices can be charged only on the computer that is running a special driver.
Despite this informative excursion into the history of the standardization of Sebastian Anthony, it is better not to risk it and use the original chargers, charging the device as recommended by the manufacturer. Tehnorealnost not always entirely consistent with the recommendations of specifications.
USB-ports, standard and charging
Personal computers may have USB-ports of two types: standard and charging. Manufacturers often bring clarity, marking the port. As a result, the situation in which the same device is charged from one of the ports of the notebook, but not charging from another. We are talking about the different ports of the same computer. This is typical of some older computers. The fact is that today it is difficult to find a laptop equipped with a standard base port in the presence of high-current charging.
Sometimes encountered another problem. Some “power hungry” devices – hard drives or optical drives – require more energy than it is able to provide a USB-port. Sometimes it can be solved by means of such a Y-cable allows you to connect one external device to the two USB-ports. Another solution is an additional AC-power adapter.
If the power supply of mobile devices most commonly used USB-port, the transport situation is different. Korean wireless trolley is an example of the original decision on the power supply.
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Tags: USB , Mobile Phones .
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