A wireless charging magnetic coupling structure and its circuit for multiple loads

Abstract

The invention relates to a wireless charging magnetic coupling structure applied to multiple loads. The wireless charging magnetic coupling structure comprises a transmitting coil and a plurality of receiving coils, wherein the receiving coils are quadrature coils shaped like a Chinese character 'tian' and quadrature coils shaped like dual Chinese character 'wang'; the transmitting coil is formed by a plurality of lead groups which are parallel to each other; current directions in any adjacent lead groups are opposite; the quadrature coils shaped like a Chinese character 'tian' consist of a first magnetic core and a second magnetic core which are perpendicular to each other; third magnetic cores vertical to the first magnetic core and the second magnetic core are arranged at the ends of the first magnetic core and the second magnetic core respectively; first windings, second windings and third windings are arranged on the outer sides of the first magnetic core, the second magnetic core and four third magnetic cores respectively; the quadrature coils shaped like dual Chinese character 'wang' are subjected to secondary extension at the ends of the first magnetic core and the second magnetic core which are perpendicular to each other. The invention also relates to a circuit. The wireless charging magnetic coupling structure is capable of effectively and evenly receiving the energy of a magnetic field by the receiving coils in the range of the transmitting coil and has higher coupling coefficient and higher electric energy transmission efficiency.

Description

technical field [0001] The invention relates to a wireless charging magnetic coupling structure and circuit for multiple loads. Background technique [0002] Wireless power transmission technology has the characteristics of convenience, no mechanical loss, and no electric sparks. It has good application prospects in various special environments such as the interior of the human body, mines, high-voltage environments, underwater, and electric vehicles. It has been recognized by the academic community in recent years. and widespread attention from the business community. [0003] At present, the magnetic coupling structure of the wireless power transmission technology mainly adopts a planar spiral coil. In the traditional magnetic coupling structure, a single coil on the transmitting side and a coil on the receiving side are usually used. The magnetic field emitted by a single transmitting coil is fixed, and a single receiving coil can only receive a magnetic field in a speci...

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Problems solved by technology

[0013] A typical example is the patent "Wireless Power Transmission in Vehicles" (application number: 201480027153.3) of the American Wireless Power Company (WiTricity); The cost is high. For the receiving coil 2, although the winding turn length is reduced and the ring winding for receiving the magnetic field in the z-axis direction is added, if you want to reduce the receiving winding turn length in the x and y-axis directions, you must reduce the maximum length of the guiding core. The peripheral cross-sectional area will lead to excessive reluctance, and the ability to converge the magnetic field transmitted in the x and y directions is obviously insufficient, and the coupling coefficient in the x and y directions is not high. This is a pair of contradictions

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