Although nowadays tablets and phones charge more and more quickly, it is rare when buying a new smartphone to have outlets capable of supporting these peak speeds.
And even so, many people still prefer to use their old 5 Watt chargers which are much slower. In this article, we present you a comparison of the best fast USB wall chargers to quickly charge your smartphone or other devices with a USB port.
What is a USB power adapter?
A USB power adapter is a kind of external power supply, most of which is enclosed in a casing similar to an AC outlet. Common names given to it include, for example, line adapter, plug-in adapter, outlet block, adapter block, converter, AC / DC, AC / DC adapter or simply AC adapter.
AC adapters are used as USB mains chargers for electrical devices that require power, but do not contain the internal components that allow them to draw from the mains the necessary energy and voltage that they need to function properly.
Note that the internal circuit of a USB Fast Charging Power Adapter is quite similar to the design that is used for internal or built-in power. USB mains chargers are used both for equipment that does not have power sources and for devices powered by a battery. This type of charger is therefore used to recharge any equipment comprising a USB, USB-C, micro-USB port, etc.
Why buy a USB wall charger?
Using a USB wall charger greatly helps in improving the portability of phones, tablets, etc. These devices which are powered either by battery or by the sector, without the addition of integrated power components. Another big advantage of these USB wall chargers is that they provide enhanced security.
Indeed, a mains supply of 120 or 240 volts is transformed into a relatively low and safer voltage at the level of the wall outlet so that the device which is then recharged is supplied by a much lower voltage.
Another advantage of USB wall chargers is the heat reduction. It is known that heat considerably reduces the longevity and reliability of the electronic components of our devices and can therefore lead to poor operation or imprecision of so-called sensitive circuits.
Using a USB mains charger eliminates a heat source from the device. In addition to reducing heat, there is also the reduction of electrical noise. Most USB mains chargers use clean, filtered direct current at a respectable distance from noise-sensitive circuits.
Buying a USB mains charger helps reduce size and weight and therefore increase transportability. With just one, you can charge all your devices (smartphone, tablet, wireless earphone, power bank, Bluetooth speaker, etc.) on the go without taking the chargers for each device.
The criteria to consider when choosing a USB mains charger
USB 2.0 mains charger or USB 3.0 mains charger?
There are two main categories of electric chargers, USB chargers areas 2.0 and USB 3.0 loaders sector . For the first category, they are the best known and the most used even if they tend to give way to the higher standard known as USB 3.0. The USB 2.0 standard works thanks to 4 contact pins. Here, the energy transfer is not optimal and therefore the charging is sometimes a little slow.
On the other hand, standard USB 3.0 mains chargers are much more efficient and much faster. These allow energy savings, this by optimizing energy efficiency. This type of electric charger works thanks to 9 pins of contacts. They are also backward compatible with 2.0 type chargers.
To get started, you need to know or have a general overview of your device. The first thing to look at is whether the device already has a specific USB wall charger . Once done, you need to know what exactly your device needs to function. The user guide shows you the data on voltage, amperage, etc. that the device needs to function properly.
The number of USB ports
One of the first criteria to consider when buying a USB power adapter is the number of USB ports. You have to choose between the simple USB mains socket (a single USB port, charging capacity of one device at a time …) and the USB mains socket (the most classic with 2 to 4 ports even if there are models ranging from up to 8 ports easily accommodating the need for charging multiple devices at the same time.
Compatibility with your devices
The other criterion will be to check the compatibility of the USB mains charger with your devices. Compatible devices are often listed in the descriptions and technical characteristics of the electric charger. Besides the compatibility, it is important to also check the amperage of the electric charger. 1A for single charges (phone or MP3 charger); 2A for tablets or camera chargers.
The price of the USB mains charger
Most USB wall chargers are not expensive, you will not fail to find several models between 15 and 30 $. However, to benefit from all the advantages of such a device, it is better to choose those that offer fast charging technology and therefore the models of the standard 3.0
How a USB mains charger works
Originally, the majority of USB mains chargers were linear power supplies that contained a transformer whose role was to convert the mains voltage to a much lower voltage. To achieve this, a rectifier ensuring the conversion of the voltage into pulsed direct current, and a filter which helps to smooth the shape of the pulsed waves in direct current.
This is possible by means of small residual ripple variations sufficient so as not to affect the device which is being powered. The weight and size of the device is largely determined by the transformer, which in turn is determined by the frequency and output power of the USB charger .
Power a few watts higher meant that the devices were too heavy and too large to be physically supported by a wall outlet. Therefore, for devices that need a more stable voltage, a linear voltage regulator circuit has been added.
In fact, the voltage of the USB mains charger is regulated, which makes it possible to power the device at the desired voltage. In addition, the high frequency ripple is more easily filtered than the mains frequency.