Asymmetric coil magnetic coupling resonant wireless power transfer method

Abstract

The invention discloses an asymmetrical coil magnetic-coupling resonant wireless power transmission system and method in the field of magnetic-coupling resonant wireless power transmission, and mainlysolves the problems of an application of a magnetic-coupling resonant wireless power transmission technology in an environment with a relatively high demand on coil size, and relatively small transmission power when a frequency splitting phenomenon occurs. According to the method, by adjusting a working frequency, the asymmetrical coil magnetic-coupling resonant wireless power transmission systemworks at a frequency point with a relatively high output power. According to the asymmetrical coil magnetic-coupling resonant wireless power transmission system and method disclosed by the invention,conditions required to be met for obtaining the relatively high output power when the system is in an overcoupling state are accurately acquired, so that the magnetic-coupling resonant wireless powertransmission system works in a state with the relatively high output power.

Description

technical field [0001] The invention belongs to the technical field of magnetic coupling resonance wireless power transmission, relates to an asymmetrical coil magnetic coupling resonance wireless power transmission method, in particular to a method of improving the output in an over-coupling state by changing the operating frequency of a magnetic coupling resonance wireless power transmission system method of power. Background technique [0002] Since Tesla proposed the theory of wireless power transmission, scientists from various countries have conducted a lot of research on wireless power transmission technology, but they have not achieved ideal results. Until 2007, scientists at MIT proposed the theory of magnetically coupled resonant wireless power transmission, and lit a 60W bulb at a distance of about 2m, with an efficiency of 40%. Because this technology has many advantages such as high efficiency, high transmission power, and small electromagnetic radiation, and i...

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Problems solved by technology

However, the transmission distance corresponding to the critical coupling state is determined, which makes it impossible for the system to be in the critical coupling state all the time, and the transmission distance has an obvious adjustment effect on the coupling coefficient. As the transmission distance decreases, frequency splitting is caused, and finally The resulting sharp drop in system transmission power has seriously hindered the popularization and application of wireless power transmission systems. Therefore, we must find a technical method to achieve greater power when frequency splitting occurs

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