Detection method of non-ferromagnetic metal foreign matter in magnetic coupling wpt system based on equivalent quality factor

Abstract

The invention provides a non-ferromagnetic metal foreign object detection method based on an equivalent quality factor of a magnetically coupled WPT system. The circuit topology is set according to the topology of the S / S-type magnetically coupled wireless power transmission system, and the equivalent quality factor threshold of the system is determined. Q e ; The terminal voltage at the front and rear ends of the primary side compensation capacitor is detected by the voltage, and the front-end voltage is recorded as U 1 , the back-end voltage is recorded as U 2 ; Judge whether the threshold value is exceeded, if it exceeds the threshold value, it will alarm and execute the foreign body disposal process. The effect is: the implementation is relatively simple, only the two-way voltage detection set at the transmitter can determine whether there is a non-ferromagnetic metal foreign body, and at the same time alarm and execute the foreign body disposal process, which can realize automatic circuit protection, automatic removal of foreign bodies and automatic energy transmission. The recovery control can be effectively applied to the S / S type magnetic coupling wireless power transmission system.

Description

technical field [0001] The invention relates to a wireless power transmission technology, in particular to a non-ferromagnetic metal foreign object detection method based on an equivalent quality factor of a magnetic coupling WPT system. Background technique [0002] In recent years, Magnetic coupling Wireless Power Transfer (MC-WPT) technology has made continuous progress and breakthroughs. It is one of the most popular research directions at home and abroad. It has a wide range of applications and has been applied to biomedical , industry, electric vehicles, household appliances, aerospace and defense and many other fields. [0003] In the application of MC-WPT system, when metal foreign matter exists between or around the coupling mechanism, it will cause the power transmission performance of the system to be reduced, fail to work normally, and even cause safety hazards. Therefore, metal foreign matter detection technology is very important. At present, many achievements...

AI Technical Summary

Problems solved by technology

As for the detection technology of non-ferromagnetic metal foreign matter, most of the existing literature only analyzes and studies its influence law and mechanism on the MC-WPT system, and there are few reports on the detection method of non-ferromagnetic metal foreign matter.

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