Since no one has yet invented an eternal source of energy, you have to regularly recharge the batteries of cell phones and various digital gadgets from the mains. It is not always possible to do this in the usual way through a wire and an outlet. Some advanced companies have already begun to release models that can be charged just by being on the site of a wireless device. Following their example, the "homemade" do not stand on the sidelines, but try to improve even some push-button phones.
New? No, the long-known "old"
To understand how wireless phone charging works, you need to remember Nikola Tesla and his way of transferring energy over a distance. With the help of a magnetic induction device, he was able to provide electricity to an entire state more than 100 years ago.
How is it being used now? In the chargerThe device has a built-in coil, which is the creator and transmitter of the magnetic field to the antenna of the device. The receiving circuit is a coil laid in a flat spiral, placed directly under the phone cover. Electromagnetic radiation occurs only after the receiver is placed in the field of the transmitter. Then, through the capacitors and the rectifier, the energy acts on the battery.
First, let's talk about the cons of using the device
Can such a wonderful invention have negative points? It turns out there are several of them:
- it is not known how high-frequency pulses affect human he alth;
- noted low efficiency when transferring energy in this way;
- a couple of extra hours increases the time for a full charge;
- if at every opportunity, without waiting for the battery to be completely reset, put your phone on a charger, the battery's working capacity will quickly decrease;
- if the scheme according to which the wireless charging is assembled by hand is not entirely correct or the wrong components are used, the battery may overheat, which is “not good.”
No other cons yet.
Instructions for modifying the "button"
The input for connecting the charging wire on the old phone does not work? Now this is an easy task! A little more than a meter of thin copper wire is taken and wound into a flat coil of 15 turns. In order for the spiral to retain its shape, itfix with superglue or double-sided tape, leaving a couple of centimeters of wire for soldering the contacts. With the phone charging socket, one end of the coil is connected through a pulsed diode, the other through a capacitor. DIY wireless charging is not a joke, but the use of the laws of physics.
To make a transmission circuit, coils of 1.5 cm of copper wire are laid around a circle with a diameter of 10 cm. The winding is fastened with electrical tape or tape, leaving both ends of the wire free. From thinner copper for the transmitter, 30 turns are wound in one direction. The circuit is closed by a field effect transistor and a capacitor. Wireless charging (do it yourself) is ready: if you put the phone with the receiver under the cover inside the transmitting ring with the screen up, the battery will begin to receive energy.
Universal wireless phone charger
Laptops and cameras, cameras and tablets - all these devices require constant power. Moreover, it is very inconvenient to store at home or carry with you a whole set of several different wires. To get rid of this inconvenience, some time ago several of the world's leading manufacturers of mobile communications equipment agreed to maintain a single standard in the use of chargers.
Gadgets that support this feature are marked with the Qi logo. It is planned to equip cafes, libraries and other public places with such technical equipment. IKEA is developing furniture samples, in the working panel of which will be builtwireless charger. With your own hands, you will only need to put your phone or laptop in the designated place (for the night or lunch time), as the energy begins to flow.
Do smartphones and iPhones also have to be disassembled?
Wireless charging for "Samsung" is by far the most unusual, as it is a functional computer monitor that supports standard operating systems. Installing this device allows not only to free the work surface from unnecessary wires for mobile phones, feeding them from a distance: when the gadget is placed on its platform, charging starts automatically, and a green LED light lights up on a monitor that supports the universal Qi standard.
Not so long ago, the inventors of Nikola Labs demonstrated one of the cases. This wireless charger for iPhone is capable of accumulating wasteful RF radiation from Wi-Fi signals, converting it into energy. Thanks to this miracle case, the working time of the smartphone is extended by almost a third.