Coupling mechanism capable of detecting foreign matters, wireless power supply system and parameter design method

Abstract

The invention provides a coupling mechanism capable of detecting foreign matters, a wireless power supply system and a parameter design method.The coupling mechanism comprises an energy transmitting coil and is characterized in that the energy transmitting coil is wound in sequence in a segmented mode, and every two adjacent segments of energy transmitting sub-coils are connected in series through a segmentation capacitor; the segmentation capacitor and one energy emission sub-coil on the inner side form a foreign matter detection sampling module, and two ends of the foreign matter detection sampling module are provided with foreign matter detection wiring taps. The metal foreign matter detection device has the advantages that on the premise that other detection coils and sensors are not additionally arranged and the performance such as power and efficiency of an original wireless power supply system is not affected, the metal foreign matter detection sensitivity is improved, the system has the foreign matter detection function while the system power supply function is achieved, manufacturing is easy, and cost is low. Compared with a traditional detection technology based on system parameters, under the same condition, the system detection sensitivity and accuracy are higher, the detected foreign matter size is smaller, and the detection effect is good.

Description

technical field [0001] The invention relates to wireless power transmission technology, in particular to a coupling mechanism capable of detecting foreign objects, a wireless power supply system and a parameter design method. Background technique [0002] Magnetically coupled wireless power transfer (MC-WPT) technology is a power transfer technology that uses a high-frequency magnetic field as an energy transfer carrier to achieve no direct electrical connection. This technology is widely used in various wireless power supply equipment, such as wireless Charging mobile phones, wireless charging electric vehicles, etc. There is a high-power high-frequency magnetic field area between the energy transmitting and receiving coils of wireless power transmission equipment. When there are metal foreign objects around or inside the area, the metal may couple with the space magnetic field and generate a secondary magnetic field, which will lead to a wireless power supply system. The ...

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Problems solved by technology

The auxiliary coil detection technology needs to introduce an additional detection coil and cover it above the transmitting coil, and the detection coil itself is easy to affect the transmission performance of the wireless power supply system, and the detection system also needs an independent excitation and signal processing device; the sensor foreign object detection technology requires More sophisticated independent devices, and high-precision sensors are extremely expensive, and their installation is greatly affected by the environment, so that the application is limited; and the foreign object detection technology based on system parameters is to use the parameters of the system itself after the appearance of foreign objects. However, the existing detection technology is difficult to detect effectively due to the small change in detection variables caused by foreign objects. The low detection accuracy and sensitivity are the biggest pain points of this technology.

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