Pro powered by usb.
Some time ago, when mobile gadgets were mostly just mobile phones, each of the manufacturers of pure specifically invented for themselves and apply their own, with nothing is not compatible form factor interface connector.
It is drawn for a your own data cable to connect to a computer and, accordingly, its own power supply. With 220 volts, and charging converter from a car's 12 volt.
Then they took counsel, and promised to come to a common denominator and unifying their interfaces.
Looking at the various current models of mobile phones, there is a tendency on the use of micro-connector yusb. Maybe this is it is, which is a universal ...
But on the second end of the data cable has long been the default put good old yusb simple.
This connector has almost every BB - laptop and desktop (or underbench who have both). It is simple as a corner of the house - two wires to transmit data tudym-syudym and two wires plus and minus for food.
This type of connector in addition to the flexibility, which is standardized at the international level, was also a mechanical Vandal.
It was the beginning of that power supplies have also started to do not with rigidly embedded power cable and supply plug yusb. It possible to use the same cable as the date when the connection to the BB, and as a charge from the power supply.
Here it should be noted that the standard defined by the output yusb BB load current limit of 500 mA.
As long as mobile telephones have a battery capacity of conventionally not very large capacity, then this current enough to charge.
But then we went to a large color screen, which were very greedy for food and the capacity of the batteries began to grow by leaps and bounds
As a result, power supply units also increased their power. But it would seem, with universal connector yusb to obtain a power supply for one or two, but at least five amp load current, then connect any device, take all the money in the current ....
It's something like that, but not so. Here begins the second phase of contradictions Contrary unification.
Each manufacturer in order to trick the user into buying them and only their products Accessory, began to invent all sorts of tricks to the user such as the iPhone not able to connect the charging of the same in Nokia or Samsung, which had lying around in a drawer and can even give the required value of charging current.
Standard scheme for high power devices HTC, LG, etc.
Contact Closure Data + and Data- tells the device that connected a powerful source, can give 5V and more 1A, if the findings do not close, the unit thinks that is connected to a standard USB and a maximum given out current total 500mA and sometimes less, thus reducing appetite or all refuses to charge.
HP almost the first began to struggle with third-party accessories by any limitations in the software and tricky wiring diagrams. Circuit of the HP iPAQ
Next Samsung. The accuracy of the selection of resistors - 5% (!!!)
The leader of the complexity of schemes has traditionally been Apple. Scheme for iPad. In this scheme, the Apple device will turn consume about 1A.
iPod and iPhone power supply different denominations of 1 resistor. In this scheme, the Apple device will enable to consume no more than 500mA.
It is worth noting that the power supply can be a current carrying capacity at least 10 Amps. As phones and tablets have built-in charge controllers and more than you need the device - do not take. And do not burn up.
For those who are poorly acquainted with electrical engineering, physics and who forgot to do poorly in school, as an illustrative example, here a bath and two pipes - thick and thin.
On thick tube filled bath at a short period of time, and a fine - for longer.
We believe that through the overflow edge is excluded - there is a protective drainpipe. To simplify the view that as soon as the protective overflow pipe water appears - on the main supply ceases.
Also works charge controller - is greater than the current set for the battery manufacturer is not taken, and when it reaches the desired voltage value, the charge is stopped.
That's right around the chargers have from which the plate is charged quickly and without problems, and on the other - in any ... ..
Another important point - the cable is best to use native or of the recommended for each specific line.
Schemes honestly peeped on the Internet.Post has been editedkym - 05.02.13, 14:23