Wireless power transfer system and power transfer method thereof

Abstract

The invention discloses a wireless power transfer system and a power transfer method thereof, and relates to the magnetically-coupled resonant wireless power transfer technology. The wireless power transfer system comprises a high-frequency signal generator, a power amplifier, a transmitting coil and a receiving coil, wherein the power amplifier is connected between the transmitting coil and the high-frequency signal generator; a repeating coil is arranged on the inner side of the transmitting coil; the repeating coil is coupled to the transmitting coil; the repeating coil and the transmitting coil are coaxial and coplanar; the receiving coil is coupled to the repeating coil; the receiving coil is further connected with loading equipment; the transmitting coil, the repeating coil and the receiving coil are made of magnetically-plated conductors. Through arrangement of the repeating coil coaxial and coplanar with the transmitting coil, a mutual inductance coefficient between the transmitting coil and the repeating coil is greatly increased, amplification of source current is achieved, and the power transfer efficiency is improved. In addition, through coaxial and coplanar arrangement of the repeating coil and the transmitting coil, the space occupation of the wireless power transfer system can be also reduced.

Description

technical field [0001] The invention relates to magnetic coupling resonance wireless power transmission technology, in particular to a wireless power transmission system and a power transmission method thereof. Background technique [0002] As early as the middle and late 19th century, the famous electrical engineer Nikola Tesla proposed the concept of Wireless Power Transfer (WPT) technology, and carried out related experimental research using the principle of wireless power transfer, which laid a foundation for the future wireless power transfer technology. The development of transmission technology has laid a theoretical and practical foundation. Since then, wireless power transmission technology has received more and more attention and research. With the rise of research on wireless power transfer technology, more and more applications have entered our lives, such as maglev trains, electric vehicles, tailless appliances, and biomedicine. [0003] At present, the wirele...

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Problems solved by technology

[0004] However, in the prior art, when the size of the receiving coil is much smaller than the size of the transmitting coil, the transmission efficiency of the wireless power transmission system is much smaller than that of a completely symmetrical wireless power transmission system with the same size of the transmitting coil and the receiving coil

In the actual wireless power transmission system, long-distance and small-sized receiving coils often appear. For example, when charging wireless mobile devices such as mobile phones, the size of the receiving coil in the mobile phone is much smaller than the size of the transmitting coil. In this wireless power transmission system , the transmission efficiency will be greatly reduced

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