In 1889, he invented the wireless charging method. The "wireless charging" technology was developed and studied at the Colorado Spring (Colorado spring) construction laboratory, that is, to convert the current low frequency and high voltage current (5060Hz) into high frequency current and then transmit electricity via air as a transmission medium. This "wireless charging" technology not only saves the cost of transmission cables, but also eliminates the loss of resistance caused by transmission. Wireless transmission technology is a kind of wireless charging, which is still in initial application stage. But the introduction of wireless transmission dates back to the 1889 Nicola Tesla master.
Technically, there is no essential difference between radio transmission technology and radio transmitting and receiving technology. But the former focuses on transmitting energy instead of information attached to energy. The biggest difficulty of wireless transmission technology lies in the dispersion and undesirable absorption and attenuation of radio waves. For radio communications, the dispersion of radio waves may not necessarily be a bad thing, but it may bring serious transmission efficiency to wireless transmission. One way is to use microwave or even laser transmission. Theoretically, the shorter the radio wavelength, the better the directionality and the smaller dispersion. The wavelength of P.s: microwave is 1mm - 1m, and the wavelength of visible laser is 4 nm - 7 nm. In addition, all the light is electromagnetic wave.
A giant forgotten by the world, and another inventor was Thomas Edison. But the two people did not become friends, but Edison often pressed the AC and his invention, because DC had too many shortcomings and limitations relative to AC, which threatened Edison's business at the time. Therefore, based on the conflict of interests, Edison had to suppress terras.
In 07 years, many websites such as China Network and China economic network mentioned the wireless charger Splash pads listed by British SplashPower company in early 2005, which is the wireless charging product of the commercialized principle of transformer (no information on the product). And on CES 2007, WildCharge also launched two wireless charger products, WildCharger and WildCharger-Mini. WildCharge's wireless charger is very similar to SpashPower's products, and it's a mattress, of which WildCharger is powerful, but can recharge the mobile phone and media player, and the laptop can be charged, while WildCharger-Mini can only be charged for small devices such as mobile phones. It is said that WildCharge has started selling products online from July 7, 2007.
In 07 and 06 months, what is the prospect of Xinhua's "air separation" power transmission? Ma Lin Sol GA Hick (Marin Soljacic), an assistant professor of MIT at the Massachusetts Institute of Technology (MIT), and his team reported in the journal Science that its pilot wireless power transmission device powered the 60 watts of light bulbs 2 meters away and lit it successfully. Even if a wood, metal or other electrical appliance is placed between the power supply and the bulb, it will not affect the luminescence of the bulb. The MIT scheme uses a magnetic field coupled resonator (Magnetically Coupled Resonators), and its transmission efficiency has been greatly improved and the distance of 2 meters is up to 40%. Unfortunately, the electromagnetic radiation generated by this technology is very large, and the security is too bad. It is far from the practical stage.
In 08 or 08 months, Intel was also reluctant to show off the wireless power transmission drive 60W light bulb on the third day of Intel Developer Forum (IDF). The research was led by Joshua R. Smith of Intel laboratory in Seattle, part of which was based on the study of Marin Soljacic, a physicist at Massachusetts Institute of Technology. It can provide power to 60W bulbs within one meter distance. It is noteworthy that its efficiency is as high as 75%.
In the 08 year and 09 months, the North American electric power symposium has successfully transmitted 800W power in a wireless way to a distance of 5 meters in a lightning laboratory in the state of Nevada. But these devices are too big to be used in small offices such as homes, offices, etc.
In 03, 05, the Guangming Daily reported a new report by the British New Scientist: a new wireless charging has been invented recently. The technology is developed based on the principle of magnetic induced power transmission and can be easily recharged for mobile phones and laptop computers. The thickness of the wireless charger cushion is less than 1 millimeters, and the price is about 50 dollars. Unfortunately, I didn't get any news from Google.
Sony recently issued a press release to explain their progress in wireless power transmission. Basically, they have been able to transmit the 50 - centimeter power of the 60W power, although the transmission itself is about 20%, but from the transmission to the wireless transmission to the receiver to return to the AC output, it will consume about 40% of the power, and SONY's technology is still hard.
Imagine what the future family would look like. As long as a high frequency transmitter (XMTR) is installed on the home ceiling, the current generates a strong electromagnetic field through the transmitter to supply electricity to all the electrical appliances in the room. Desk lights no longer need wires, laptop batteries no longer need batteries, and phones will automatically recharge. Moreover, it is not necessary to consider how to arrange wiring when decorating. I just hope that at that time, my neighbor should not steal the radio I paid.Now wireless