A Wireless Energy Transmission Coil System Using Magnetoelectric Coupling to Cancel and Suppress Frequency Splitting
A technology for suppressing frequency and magnetoelectric coupling, applied in the direction of transformer/inductor coil/winding/connection, transformer/inductor components, circuits, etc., can solve the problems of increasing system complexity, difficulty in debugging and application, etc. The effect of increasing the coil volume, reducing the size, and increasing the mutual capacitance coefficient
Active Publication Date: 2020-04-28
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
However, this system needs to add frequency measurement circuit, phase-locked loop circuit and voltage sampling control circuit to the original WiTricity system, which increases the complexity of the system and brings certain difficulties to the realization of debugging and application.
In 2014, in the literature "Lee W, Oh K, Yu J, "Distance-Insensitive Wireless Power Transfer and Near-Field Communication Using a Current-Controlled Loop With a Loaded Capacitance," IEEE Transactions on Antennas&Propagation,2014,62(2): 936-940.", a forward and reverse coil was proposed, which can achieve more than 60% efficient transmission within a distance of 0 to 7cm. The reverse coil of this type of coil system limits the transmission distance of the system.
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[0020] The structure of a wireless energy transmission coil system that uses magnetoelectric coupling to cancel and suppress frequency splitting is as follows: figure 1 As shown, the relevant dimensions are as figure 2 As shown, the thickness of the selected metal sheet is 2mm, the distance between the coils is dis, the specific circuit size is selected as follows: coil diameter d = 185mm, metal sheet width a = 25mm, coil thickness c = 30mm, coil copper wire diameter r = 2mm, the overall size is 235mm×235mm.
[0021] image 3 It is the simulation result of the transmission efficiency of the coil system changing with the distance. It can be seen that the original coil has an efficiency of more than 80% only from 8 to 14cm, and the variable distance range is only 6cm, and the efficiency drops sharply when it is close. The improved coil has a transmission efficiency higher than 80% within a distance of 0 to 10 cm, and the variable distance range is 10 cm. The present inventio...
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Abstract
The invention discloses a wireless energy transmission coil system for counteracting and restraining frequency splitting by magnetoelectric coupling. The wireless energy transmission coil system comprises an energy transmitting coil, an energy receiving coil and four loaded annular metal sheets, wherein the first annular metal sheet, the second annular metal sheet, the third annular metal sheet and the fourth annular metal sheet are loaded between the transmitting coil and the receiving coil for expanding the variable-distance range of the power transmission. According to the receiving and transmitting coil systems designed by the invention, the coil operates under a magnetic coupling-electric coupling state; in a moving process from a remote distance to a near distance, the coupling coefficients among the coils are changed slowly and smoothly; a relatively low coupling degree still can be kept, so that a phenomenon of frequency splitting is not generated, and high-efficiency energy transmission among the systems all can be kept; and electric coupling is introduced on the basis of the magnetic coupling operating mode of the conventional wireless energy transmission coil system, so that the conventional distance-sensitive energy transmission system is changed into the variable-distance high-efficiency energy transmission system.
Description
technical field [0001] The invention relates to the technical field of high-efficiency wireless power transmission systems with variable distances, in particular to a wireless power transmission coil system that uses magnetoelectric coupling to offset and suppress frequency splitting. Background technique [0002] The traditional way of electric energy transmission is mainly in the form of wire connection, but the wire will take up a lot of space resources, consume a lot of metal resources, and at the same time, it is easy to generate contact sparks, which brings great safety hazards to survival and life; in addition In addition, in some applications, it is impossible to use wires for power transmission, and the use of batteries limits the service life of the device to a large extent. Under these backgrounds, people began to try a new power transmission technology—wireless power transmission technology. [0003] In 2007, researchers at the Massachusetts Institute of Technol...
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IPC IPC(8): H02J50/05H02J50/10H01F38/14H01F27/28
CPCH01F27/2823H01F38/14
Inventor 章秀银薛成戴李斌
Owner SOUTH CHINA UNIV OF TECH