Wireless power transmission foreign matter detection and living body detection sharing system and identification method

Abstract

The invention provides a wireless power transmission foreign matter detection and living body detection sharing system and an identification method. The system includes: a digital frequency synthesizer, a processor, a resistor Rin, an operational amplifier, an analog-to-digital converter, a band-pass filter, a resistor Rp, a parallel resonant capacitor Cp and a plurality of detection coils Lk (k =1, 2, n). The digital frequency synthesizer is connected with the inverting input end of the operational amplifier through the resistor Rin. The in-phase input end of the operational amplifier is grounded, the output end of the operational amplifier, the analog-to-digital converter and the band-pass filter are connected in sequence, and the resistor Rp, the parallel resonant capacitor Cp and theplurality of detection coils are connected to the reverse input end and the output end of the operational amplifier in parallel. By monitoring the impedance characteristic change trend of the detection coil under multiple resonant frequencies when different types of foreign matters exist, information such as existence and types of the foreign matters is extracted, and detection of living foreign matters and metal foreign matters is realized at the same time.

Description

technical field [0001] The invention relates to a common system and identification method for wireless energy transmission foreign object detection and living body detection, and belongs to the field of wireless energy transmission technology and foreign object detection technology. Background technique [0002] The principle of wireless power transmission technology is to pass an alternating current excitation to the transmitting coil to generate an alternating magnetic field, through which the energy is coupled to the receiving coil and provides electrical energy to the load, thus realizing the wireless transmission of electrical energy. Compared with the traditional method of power transmission through metal wires, wireless power transmission technology can avoid problems such as electric sparks, contact wear and aging of plugs, and can be applied to non-contact power transmission occasions. During the gradual application of this technology, its safety issues (such as: fo...

AI Technical Summary

Problems solved by technology

[0008]The purpose of this invention is to propose a common system and identification method for wireless energy transmission foreign object detection and living body detection, so as to solve the problem that the existing technology of wireless charging foreign object detection cannot simultaneously realize the conduction The detection of foreign matter and living foreign matter and the identification of foreign matter types, and the cost is high, it is not easy to integrate, and it is greatly affected by the environment and the strong alternating magnetic field.

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