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How to Wireless Charging Mouse Pad Works？

Wireless charging is becoming increasingly popular. Simply place the device – such as a phone or watch – in the right spot, and it will start charging on its own. No need to search for cables or sockets!

How does a wireless charger work?

The charger is equipped with a long, spiral-wound wire that forms a transmitting coil. When an alternating current flows through the coil, it generates an electromagnetic field around it. The intensity of this field depends on the number of turns in the coil and the current passing through it.

How does it work?

The principle behind this device has been known for years, as it was explored by Nikola Tesla, a Serbian-born scientist, who delved into the mystery of wireless transmission of electrical energy. His achievements, along with several well-known laws of physics, allowed for the intended goal to be achieved, albeit over a short distance.

The system supplying energy to the receiver powers a coil with alternating current of the appropriate shape, number of turns, and size. This creates a variable magnetic field around it. The receiver, equipped with a similar coil, converts the energy from the magnetic field back into electric current, which is then rectified, filtered, and stabilized. Thus, energy transmission occurs, even though there is no physical connection between them.

Someone observant may notice that this works just like a regular transformer – and they are absolutely right! However, in a transformer, both windings, i.e., the primary and secondary, are very close to each other, and they are additionally passed through a ferromagnetic core to improve the penetration of the magnetic field between them. Meanwhile, here the core is air (meaning it does not exist), and the coils are at a certain distance from each other.

Nothing is free This solution generates some losses. Firstly, the energy of the received wave decreases with distance (more precisely – proportionally to the square of the distance), so every unnecessary millimeter of distance between the coils causes a loss of some of it. That’s why powering, for example, a passenger car from a transmitter located in a home several meters, or even kilometers away, is a science fiction idea.

Additionally, the magnetic field emitted by the transmitter induces current not only in the receiver coil but also in all metal elements within its range. Moreover, the electronic systems handling transmission and reception require some power.

Standardization

Of course, not every coil will be suitable for this purpose, and other parameters (such as operating frequency) must match for both the receiver and transmitter. There are several standards for wireless power transmission, but one of them leads the way. It bears the abbreviated name Qi, developed by the Wireless Power Consortium (WPC).

How to use a wireless charger?

The device you want to charge in this way must have this capability. Therefore, the manufacturer must ensure the inclusion of an appropriate coil inside, along with an electronic module that processes the received energy. More and more smartphones, smartwatches, and other portable devices have this function.

On the packaging or among the settings, you can find a pictogram indicating this. Usually, it is a combination of a lightning bolt and circles symbolizing radio waves.

You will also need a special charger. These devices are becoming cheaper, so it’s worth considering placing it where you most often leave your phone for a longer period – at home or at work.

You will need a mains adapter, which can usually be a regular charger with a USB output. Using the appropriate cable, connect these two devices, then plug the adapter into the socket. Ready!

You can also use a power supply with a different output voltage – details can be found in the specifications of the wireless charger.

To start charging, simply place the device on the charger – and nothing more. The whole process will start automatically, usually within a few seconds of placing the device on the surface of the wireless charger. It will also end by itself when you remove the device from it or when the battery is fully charged.

A few recommendations To ensure smooth charging, there should be no metal elements on the device’s housing. For example, a phone case should enable wireless charging – it must be made entirely of a material neutral to the magnetic field. Keeping keys, coins, or other metal trinkets in it may slow down or even prevent charging altogether.

The device should be placed in the center of the stand or area designated for charging. Otherwise, energy transmission between the coils will be hindered because the distance between them will become high. Therefore, careless placement of the phone on the charger may prevent charging from starting at all.

Regarding distance, all kinds of cases or covers can also disrupt the charging process, even if they do not interact with the magnetic field. A too thick phone case may create a distance large enough to hinder charging.

 

Summary A wireless charger is a device that can protect busy users of modern electronic equipment from unexpected discharges of their devices. Simply place them on the charger’s surface to draw energy from it, without constantly plugging and unplugging the cable.