USB chargers are cu rrently the most frequent devices which are used in charging Smartphones and tablets. The items are of three main specifications: USB 1., 2., and 3.. Of the three, USB 2. is the most common. - USB Charger
Within the USB network, there is certainly always the host as well as the device. If you are using computer to charge your phone, you PC becomes the host and you phone becomes the device, for example.
If you are using a wall charger, the charger becomes the host and your tablet or phone becomes the device. In all times, power flows through the host for the device.
If you look closely, you will see that a USB socket has four pins. The USB cable also has four wires. The inside pins carry data (D and D-) while the outside pins provide power.
Charging process
It's good to note that different USB ports charge the devices connected to them differently. As an example, you will see that one port charges your phone fast while another port charges the identical phone very slowly.
There are two factors that determine the pace in which your device charges over USB: the utmost amperage of the USB socket or wall charger and exactly how your device requires power from your charger.
All chargers have maximum amperage which is usually between 500 1 and milliamps.5 amps. Typically a PC has 500mA while the max amperage of a wall charger differs from one device to another one. Although, this is actually the case, the amperage of wall chargers is usually between .2 and 5A.1A.
How your device negotiates with the charger greatly determines the way your device charges. When you plug your device to the wall charger or charging socket, the USB controller within your device communicates with all the USB controller linked to the charger.
The device reads the voltage flowing across the USB pins and from the data the device decides on the amount of amperage that it should draw if there is no controller.
Can a USB device blow up during charging?
The answer is No. You are able to plug any USB device into any USB cable and into any USB port without the problems and your device won't blow up. Which means that you can connect a Smartphone which was included with a 900mA charger into a 2100mA as well as the device won't blow up. - USB Charger
According to experts, connecting your device to a higher power source doesn't result to blowing up of the device, but instead speeds up the rate at which the battery charges.