Single-layer array sensing coil type foreign matter detection system applied to magnetic coupling resonance wireless electric energy transmission and blind elimination method of single-layer array sensing coil type foreign matter detection system

Abstract

The invention discloses a single-layer array sensing coil type foreign matter detection system applied to magnetic coupling resonance wireless power transmission and a blind elimination method thereof.The detection system comprises a transmitting end and a receiving end, and the transmitting end comprises a foreign matter detection single-layer array sensing coil, a transmitting coil, a transmitting end magnetic shielding layer and a transmitting end magnetic core; the receiving end comprises a receiving coil, a receiving end magnetic shielding layer and a receiving end magnetic core; the foreign matter detection single-layer array sensing coil is composed of a plurality of small-size sensing units, and the plurality of sensing units are uniformly and densely distributed and completely cover the whole detection area without leaving any unoccupied space, so that direct elimination of a blind area is realized. In the working time of the foreign matter detection system, each array type sensing unit dynamically works and stops according to a certain frequency and rule, and when a certain foreign matter just falls into an indirect blind area of a certain specific anti-series sensing unit, other anti-series sensing units can effectively detect the foreign matter, so that the foreign matter detection efficiency is improved. And the indirect blind area is eliminated.

Description

technical field [0001] The invention belongs to the technical field of foreign object detection in wireless power transmission, and in particular relates to a single-layer array sensor coil type foreign object detection system and a detection method applied to magnetic coupling resonance wireless power transmission. Background technique [0002] The wireless energy transmission technology breaks through the constraints of cables, requires no electrical connection, no exposed interface, no contact sparks and wear and aging problems, and has strong adaptability to bad weather or environments such as rain and snow, and the energy transmitting device hardly occupies the ground space , occupy less land resources and low maintenance cost. This technology can not only alleviate the battery life problem of electric vehicles and enhance the ability of the vehicle to interact with the power grid, but also has received extensive attention from academia and industry at home and abroad i...

AI Technical Summary

Problems solved by technology

However, when a foreign object with uniform texture (such as a coin or other regular-shaped metal sheet, etc.) happens to cover the same area of ​​the two sensing units in anti-series (such as figure 1 : The foreign matter is geometrically symmetrical about the plane β, and the anti-series detection units are also geometrically symmetrical about the plane β, and the foreign matter is directly above the group of detection units), or when the electromagnetic influence of the foreign matter on the two anti-series sensing units happens to be the same In the case of offset, this detection method will fail due to the decoupling between the coil and the foreign object, that is, this method will naturally cause a detection blind area, which is called an indirect blind area, and the size of the indirect blind area is related to the sensor The unit structure and the structure and nature of the foreign matter are related, so the time and space of the indirect blind zone have a certain degree of randomness, so its impact on system security is severe and significant, and engineering applications must never allow such a situation to occur

In order to solve the above problems, the technology of double-layer sensing coils working together is usually used in engineering. Specifically, the double-layer coils are arranged in parallel and dislocated so that the respective blind spots of the two-layer sensing coils are staggered, so as to ensure that the When one layer of sensing coil triggers the indirect blind zone, the other layer of sensing coil can normally identify the foreign object. Although the method works, it will significantly increase the cost and complexity of the system, and will greatly reduce the valuable resources of the wireless power transmission system. Energy transmission distance is sacrificed

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