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Wireless Charging: Everything you need to know – Guide
There are essentially three types of wireless charging, according to David Green, research manager at IHS-Markit. There are charging pads that use tightly coupled inductive or non-radiative electromagnetic charging; Charging bases or surface chargers that use weakly coupled or radiated electromagnetic resonant charges capable of transferring a charge of a few centimeters; and decoupled radio frequency (RF) radio charging, allowing for lazy charging capability over many feet distances. Both tightly coupled inductive charging and loosely coupled resonant charging work on the same physical principle: a time-varying magnetic field induces a current in a closed loop of wire.
Wireless charging is gaining traction in the healthcare, automotive and manufacturing sectors as it offers the promise of greater mobility and advancements that can allow small Internet of Things (IoT) devices to be powered many meters away from a charger to be taken care of. A magnetic loop antenna (copper coil) is used to create an oscillating magnetic field that can generate a current in one or more receiving antennas.
Adding the appropriate capacitance so that the loops oscillate at the same frequency increases the amount of current induced in the receivers. This is resonant inductive charging or MRI; it allows the transfer of energy over greater distances between the transmitter and receiver and increases efficiency.
How wireless charging works
At the final 1800’s Nikola Tesla successfully transmitted electricity through the air. He used a process called resonant-inductive coupling, which works by creating a magnetic field between a transmitter (which sends out electricity) and a receiver (which receives the electricity) to power light bulbs in his laboratory in New York.
A few years later, he patented the Tesla coil – a tower with a coil on top that fired bolts of electricity. Tesla had much bigger visions of a wireless power grid, but those dreams were never realized.
Disadvantages of wireless charging
Wireless charging has its downsides. Wired charging is faster and more efficient, but the farther the receiver is from the transmitter, the less power it will receive from a magnetic field. Phones It needs so much power that the charging distance is just a few millimeters.
an assistant professor of computer engineering at Northwestern University in Chicago said that the bigger the coil, the more energy it can send out, but that wouldn’t be very efficient. The field is strongest at its center. “This field goes down very quickly,” he said. “There’s still some energy after two centimeters, five centimeters. At 10, it’s like, nothing. If you had a table-sized coil, you could probably hold it 30 centimeters above the table, but that would be using a lot of energy.
That’s the big problem with wireless charging in general. Research is trying to increase charging efficiency, or make our phones more energy efficient.”
How to choose a wireless charger
There are many wireless chargers on the market with different prices and quality levels.
Final note
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