A metal foreign object detection method for an inductive power transmission system

Abstract

A metal foreign object detection device and detection method of an inductive power transmission system, the main components of the device are: the output of the high-frequency inverter is connected to the input of the compensation device of the detection coil, and the output of the compensation device is connected to the detection coil; The current sensor and the voltage sensor on the output end of the high-frequency inverter are connected to the corresponding input end of the processor; the output end one of the processor is connected to the control end of the high-frequency inverter; the detection coil is laid on the induction power transmission system The surface of the energy transmitting coil; the polarity of the energy transmitting coil is different from that of the detecting coil; the second output terminal of the processor is connected with the input terminal of the main processor of the inductive power transmission system. The device and the method are used to detect metal foreign matter, which has little influence on the system, simple principle, high sensitivity of foreign matter detection, and can effectively improve the transmission efficiency and safety of the inductive electric energy transmission system.

Description

technical field [0001] The invention relates to a metal foreign object detection device and a detection method of an inductive electric energy transmission system. Background technique [0002] Inductive power transfer technology has been applied to power communication tools, household appliances, electric vehicles, implanted medical devices, rail transit trains, etc. Compared with the traditional contact-type power-taking method, the power transmission process of the inductive power transmission system is not affected by natural weather such as dust, dirt, wind, rain, ice and snow, and other chemical substances. There is no contact spark and mechanical wear, which effectively improves the power supply. safety and reliability. [0003] The structure and working principle of the inductive power transfer system include: the direct current is transformed into high-frequency alternating current under the action of the high-frequency inverter; the high-frequency alternating curr...

AI Technical Summary

Problems solved by technology

These two methods can effectively detect metal foreign objects in low-power inductive power transfer systems, but for higher-power inductive power transfer systems, the detection sensitivity is low and metal foreign objects cannot be effectively detected

Because, when the power is small, the power loss of metal foreign objects accounts for a large proportion of the system power, causing large changes in the power, current or voltage of the inductive power transfer system, so metal foreign objects can be detected; however, in high-power inductive power transfer systems , the power loss of metal foreign objects accounts for a small proportion of the system power, and hardly causes changes in the current or voltage amplitude of the inductive power transmission system, so metal foreign objects are not easy to be detected

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