A receiving device, magnetic coupling system and wireless power transmission circuit

Abstract

An embodiment of the invention provides a receiving device, a magnetic coupling system and a wireless electric energy transmission circuit. The receiving device comprises a first wire coil, a second wire coil and a third wire coil, wherein an area formed via enclosure of projection of the second wire coil and an area formed by enclosure of projection of the first wire coil are isolated from each other, a figure formed via enclosure of projection of the third wire coil is divided into a first part and a second part via a first straight line, the first part is greater than the second part in area, and the second part is positioned between the first part and the second wire coil; or the figure formed via the enclosure of projection of the third wire coil is positioned on one side, placed far away from the second wire coil, among two sides of the first straight line which equally divides the area formed by enclosure of projection of the first wire coil, and the first straight line is parallel to a reference line of an emitting device. Thus, when the receiving device is large in offset distance, only small loss of magnetic coupling coefficients of the magnetic coupling system is caused.

Description

technical field [0001] Embodiments of the present invention relate to the field of circuits, and more specifically, to a receiving device, a magnetic coupling system, and a wireless power transmission circuit. Background technique [0002] Wireless charging is a charging method that has emerged in recent years. It has better safety and convenience, especially in the charging of electric vehicles. It has a better application prospect. [0003] A wireless power transmission device for wireless charging has a magnetic coupling system. A magnetic coupling system is provided in the prior art. The magnetic coupling system is composed of a transmitting coil and a receiving coil, and both the transmitting coil and the receiving coil include two coils. The transmitting coil is connected to the first circuit, and the two coils in the transmitting coil are respectively used to generate magnetic fields in opposite directions. After the magnetic field is coupled to the receiving coil, th...

AI Technical Summary

Problems solved by technology

However, when the central position of the transmitting coil deviates greatly from the central position of the receiving coil, one of the receiving coils not only couples magnetic fields in two directions, but also has a large difference in magnetic fluxes corresponding to the magnetic fields in the two directions. less, resulting in less net magnetic flux in the coil, which in turn leads to poor coupling performance of the magnetic coupling system, and a large drop in coupling coefficient; especially when the offset distance reaches a certain distance, the magnetic flux in the two directions of the coil cancel each other out, and the net magnetic flux is 0, so that the coupling coefficient of the magnetic coupling system is seriously reduced

In this way, the severe drop of the coupling coefficient causes the performance drop of the magnetic coupling system, which directly affects the output power and transmission efficiency of the wireless power transmission device.

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