Metal foreign object detecting system of string type radio energy transmission system

Abstract

The invention relates to a metal foreign object detecting system of a string type radio energy transmission system, and belongs to the technical field of metal foreign object detection in radio energytransmission. The invention aims to solve the problem that the detection sensitivity of the metal foreign object in the wireless energy transmission system is low and coaxial transmitting and receiving coils are required. A high frequency square wave power supply is used to provide a voltage signal that can be decomposed into a fundamental wave and each odd harmonic for the transmitting unit of the wireless energy transmission system; a fundamental energy transmitting current is included in the receiving unit of the wireless energy transmission system; a detecting unit is used to generate aninduced voltage based on the transmitting coil by detecting the coil set; a converting unit is used to sequentially filter, rectify and condition the induced voltage to obtain an adjusted amplitude ofthe induced voltage; and a control unit is used to control the on and off and frequency of the high frequency square wave power supply. The metal foreign object detecting system provided by the invention has the advantage of high detection sensitivity without affecting the transmission of electric energy on the basis of realizing the detection of metal foreign objects, and does not affect the detection effect when the transmitting and receiving coils of the power transmission system are misaligned.

Description

Technical field [0001] The invention relates to a metal foreign body detection system of a string type wireless power transmission system, and belongs to the technical field of metal foreign body detection in wireless power transmission. Background technique [0002] Magnetic coupling resonance wireless power transmission technology uses electromagnetic field as the electric energy transmission medium, adopts the principle of resonance, improves the transmission efficiency and distance, weakens the requirements for the relative position of the coil, and is safer and more reliable. [0003] Since the magnetic coupling resonance wireless power transmission technology is not a laminated transmission, metal foreign objects may appear in the transmission space. The presence of metal foreign objects will cause changes in the electromagnetic parameters of the power transceiver coil, and the resonance point will shift; at the same time, eddy current loss occurs inside the metal foreign obj...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the detection sensitivity of metal foreign objects in the existing wireless power transmission system is low, and the sending and receiving coils are required to be coaxial, the present invention provides a metal foreign object detection system for a serial wireless power transmission system

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