Metal foreign object detection method for a wireless power transmission system

Abstract

An embodiment of the present invention provides a metal foreign object detection method for a wireless power transmission system, including: analyzing the mutual inductance between the transmitting end and the receiving end in the wireless power transmission system, and obtaining the mutual inductance between the transmitting end and the receiving coil when the receiving end is a receiving coil. The expression of mutual inductance, and the expression of mutual inductance between the transmitting end and the metal when the receiving end is metal; the mutual inductance between the transmitting end and the receiving end of the measurement system is compared with the theoretical value of mutual inductance obtained through the calculation of each expression, and the judgment system Whether there are metal foreign objects in the The present invention also judges whether there is a metal foreign object in the system by comparing the equivalent impedance of the metal and the receiving coil, prevents the system from transmitting energy from the metal object as the target load, reduces the security threat and energy loss to the system, and improves the safety and security of the system. reliability. The metal foreign object detection method does not need to add an additional metal detection device, and can realize safe and reliable metal foreign object detection for a high-dimensional wireless power 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

Images