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We main do in AC Adapter, Laptop Adapter, Wireless Charger, USB Charger and Power Supply.
The transfer of power was the very first attempt using radio waves as a medium. Radio waves were first predicted in 1864 by James C. Maxwell. In 1888, Heinrich Hertz showed evidence of radiowaves using his spark-gap radio transmitter. Nikola Tesla believed that wireless power transfer was possible and probable. He built what was called the [Tesla Tower" which was a giant coil connected to a 200 foot high tower with a ball 3 feet in diameter. Tesla pumped 300 kW of power into the device; the coil resonated at 150 kHz. The experiment failed due to the fact that the power diffused in all directions.
In the 1960s, much research was put into using microwaves to transmit power. William C. Brown made what he called a [rectenna". This device received radio frequencies and converted them into a direct current. Brown succeeded but with low efficiency. Canada successfully flew a fuel-free model airplane in 1987 by transmitting a 2.45 GHz, 10 kW microwave to the model plane.
There were also attempts to transfer power through induction. This was first used when, in 1894, M. Hutin and M. Le-Blanc proposed an apparatus and method to power an electric vehicle. However, combustion engines proved more popular and this technology was forgotten for a time.
In 1972, Professor Don Otto of the University of Auckland proposed a vehicle powered by induction using transmitters in the road and a receiver on the vehicle.
In 1977, John E. Trombly was awarded a patent for an "Electromagnetically coupled battery charger". The patent describes an application to charge headlamp batteries for miners.US 4031449
The first application of inductive charging used in the United States was performed by J.G. Bolger, F.A. Kirsten, and S. Ng in 1978. They made an electric vehicle powered with a system at 180 Hz with 20 kW.
In California in the 1980s, a bus was produced which was powered by inductive charging, and similar work was being done in France and Germany around this time.
In 2006, MIT began using resonant coupling. They were able to transmit a large amount of power without radiation over a few meters. This proved to be better for commercial need, and it was a major step for inductive charging.
The Wireless Power Consortium (WPC) was established in 2008, and in 2010 they established the Qi standard. In 2012, the Alliance for Wireless Power (A4WP) and the Power Matter Alliance (PMA) were founded. Japan established Broadband Wireless Forum (BWF) in 2009, and they established the Wireless Power Consortium for Practical Applications (WiPoT) in 2013. The Energy Harvesting Consortium (EHC) was also founded in Japan in 2010. Korea established the Korean Wireless Power Forum (KWPF) in 2011. The purpose of these organizations is to create standards for inductive charging.
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