Today is era of the wireless media and modern technology. So, why not we would like have a charger which charges our electronic devices wireless??
Did i say “WIRELESS CHARGER”?? I know! I know! It’s an old news for you tech enthusiast and many of us are even using it right now, but do you know how it works??
let’s know something more about it!
The concept of Wireless transfer of power is not new. In 1831, Michael Faraday discovered induction in sending electromagnetic force through space. In the late 1800s and the early 1900s, Nicola Tesla demonstrated wireless broadcasting and power transmission.The experiments in Colorado Springs in 1899 lead to the Wardenclyffe Tower in New York. Tesla wanted to prove that electrical power could be transmitted without wires, but lack of funding
halted the project.It was not until the 1920s that public broadcasting began. Europe built massive transmitters to reach many countries. The transmitter at Beromünster in Switzerland could have transmitted at 600 KW, but legislation on electro-smog and protests from the local population limited the power to 180 KW. Smaller FM stations have since replaced these large national transmitters.
Now a days from smartphones and small electronic devices to mission critical equipment, wireless power maintains safe,reliable transfer of power to ensure all forms of device and equipment are always charged and ready to go.By eliminating the use of a physical connector or cable, wireless charging provides a number of advantages including, efficiency, cost and safety.
What is wireless charging ?
Wireless charging is essentially the transmission of an electrical current from a power source to a receiving device without the use of a physical connection.It is similar to how Bluetooth and Wi-Fi works but unlike Bluetooth and WiFi,the concept rests on inductive coupling using an electromagnetic field that transfers energy from the transmitter to the receiver;in which the electrical current is used to charge or re-charge the battery of the receiving device.In this circumstance the receiving device can be anything from a smartphone or wearable, to a large industrial forklift.
How does it work?
Wireless charging is based on the principle of magnetic resonance or inductive power transfer (IPT) – the process whereby electricity is transferred between two objects through coils.Wireless charging shares similarities with radio transmission sending signals by electro-magnetic fields. Wireless charging operates
in a near field condition in which the primary coil produces a magnetic field that is picked up by the secondary coil in close proximity. The radio transmitter,on the other hand, works on the far field principle by sending waves that travel through space. While the receiving coil of the wireless charger captures most of the energy generated, the receiving antenna of the radio only needs a few micro volts (one millionth of a volt) to recover a signal that becomes intelligent when amplified.
Wireless charging is mainly classified into
-radio charging and
Most of today’s wireless chargers use inductive charging with transmit and receive coils in close proximity.This is the exact same principle followed in most of the electrical transformers.Electric toothbrushes were one of the first consumer goods to adopt this method and mobile phones is becoming the largest growing sector because of
These days , your smartphone with Wireless charging mechanism comes with a charging pad or charging cover. Actually these charging pad or cover contains lots of smaller coils which will emit electromagnetic radiation when connected with electricity. The smaller coils are designed such that the alternate coils are charged with your alternate form of current viz., Alternate Current. These alternate charging of minute coils and corresponding emission of electromagnetic radiation poses different electromagnetic fields at different points of time.
Your smartphone also contains few minute but stationary coils and when your smartphone is placed on the charging
pads or covers, the coil in your smartphone actually acts as if cutting the electromagnetic fields created at various points by your charging pad or cover. Thus cutting of electromagnetic field by the coils of your smartphone induces current or electricity. The smaller amount of electricity thus created is transmitted to the battery of your smartphone, keeping it live. These mini doses of electricity actually accumulates in the battery of your smartphone and therefore, the battery gets fully charged depending on the time interval at which these charging pads or covers are being used for charging.
Some of the Modern wireless charging even adheres to a complex handshake to identify the device to be charged. When placing a device onto the charging pad, a change in capacitance or resonance senses its presence. The pad then transmits a burst signal; the qualified device awakens and responds by providing identification and signal strength status. These signals are often used to improve the positioning of the receiver or enhance magnetic coupling between charging pad and receiver.
“Shake to charge” apps,available at Google Play works on this same complex handshake identification mechanism.The charging pad only transmits power when a valid object is recognized, which occurs when the receiver fulfills the protocol as defined by one of the inter-operability standards. During charging, the receiver sends control error signals to adjust the power level. Upon full charge or when removing the load, the pad switches to standby.
Pros and Cons of wireless charging
Wireless charging offers the ultimate convenience for consumers. It also allows safe charging in a hazardous environment where an electrical spark could cause an explosion.Makers of electric vehicles seek simplification in charging and this is elegantly solved by parking the vehicle over a transmit coil.
However the lost energy turns into heat and a wireless charger can get quite warm during charging. If the generated heat is not controlled properly,temperature increase causes stress to the battery and reduces life. larger risk, if any, is carrying a mobile phone close to the body. In standby mode the device is constantly seeking contact with a tower by transmitting signal busts. The transmit power is adjusted to the proximity to the tower and is higher in fringe areas.So, wireless charging is not without short comings though it has wide future advancement.
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