Metal foreign matter detection method of wireless electrical energy transmission system

Abstract

The embodiment of the invention provides the metal foreign matter detection method of a wireless electrical energy transmission system. The method comprises the following steps of analyzing mutual inductance between a transmitting end and a receiving end in the wireless electrical energy transmission system, obtaining a mutual inductance expression between the transmitting end and a receiving coilwhen the receiving end is the receiving coil, and obtaining the mutual inductance expression between the transmitting end and metal when the receiving end is the metal; and measuring the mutual inductance between the transmitting end and the receiving end of the system, comparing with a mutual inductance theoretical value acquired through calculating each expression, and determining whether a metal foreign matter exists in the system. In the invention, through comparing the metal with the equivalent impedance of the receiving coil, whether the metal foreign matter exists in the system is determined, the system is prevented from taking a metal object as an original target load to carry out energy transmission, the safety threats and the energy losses of the system are reduced, and the safety and the reliability of the system are increased. By using the metal foreign matter detection method, an extra metal detection device does not need to be added, and safe and reliable metal foreign matter detection can be performed on a high-dimensional wireless electrical energy transmission system.

Description

technical field [0001] The present invention relates to the technical field of wireless power transmission, and more specifically, to a metal foreign object detection method of a wireless power transmission system. Background technique [0002] In the 21st century, human beings are faced with the major challenge of achieving sustainable economic and social development, and environmental and energy issues have increasingly become one of the prominent issues in the world. How to effectively utilize existing energy sources has aroused extensive attention of scholars from various countries. New electric energy storage and transmission technologies, such as flywheel batteries, supercapacitors and wireless power transfer technologies, are important ways to achieve efficient energy utilization. Wireless power transmission technology mainly uses electromagnetic coupling, microwave, electromagnetic resonance and other forms to transmit electric energy, and there is no wire connectio...

AI Technical Summary

Problems solved by technology

[0003] At present, with the promotion of wireless power transmission technology, its application is becoming more and more complicated

When the system is running normally, obstacles of different materials may appear in different positions around, especially the appearance of metal obstacles will have a great impact on the working status of the entire system, and even cause the system to be out of tune and not work properly

[0004] The transmitter and receiver of the wireless power transfer system are coupled through a magnetic field. Metal foreign objects in the magnetic field will affect the coupling relationship of the system, reduce the transmission efficiency of the system, and even cause damage to the system.

[0005] The existing metal foreign object detection method of the wireless power transmission system generally adds an additional metal detection device to detect the metal foreign objects of the wireless power transmission system, and the detection process is cumbersome

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