Electric vehicle wireless charging system with metal foreign substance detection

Abstract

The invention discloses an electric vehicle wireless charging system with metal foreign substance detection. The system comprises a wireless electric energy emitting device, a wireless electric energy receiving device, and a metal detection device, wherein the input end of the wireless electric energy emitting device is connected with a power supply component, the output end of the wireless electric energy emitting device is connected with a wireless electric energy emitting coil, and the wireless electric energy emitting coil is capable of producing a high frequency resonant magnetic field with fixed frequency; the input end of the wireless electric energy receiving device is connected with a wireless electric energy receiving coil, and the wireless electric energy receiving coil is coupled with the wireless electric energy emitting coil; when the resonant frequency of the wireless electric energy receiving coil is the same as the fixed frequency produced by the wireless electric energy emitting coil, the wireless electric energy receiving coil end produces induced electromotive force and is used for charging an accumulator of the electric vehicle connected with the output end of the wireless electric energy receiving device; the metal detection device comprises a balance structure metal detection coil laid on the surface of the wireless electric energy emitting coil; the metal detection coil and a metal detection circuit form a loop to detect whether a metal foreign substance is existent in the magnetic field.

Description

technical field [0001] The invention belongs to the field of electric vehicles, in particular to a wireless charging system for electric vehicles with detection of metal foreign objects. Background technique [0002] With the increasing shortage of global oil resources and the continuous deterioration of the natural environment, finding efficient energy-saving and environmental protection methods and technologies to solve energy and environmental problems has become one of the most popular research topics in the world today. Electric vehicles, using electric energy as the driving force, have the characteristics of zero emission and zero pollution. In recent years, they have been considered as the most promising means of transportation. At present, European countries such as Germany, France, and the United States, as well as Asian countries such as Japan and South Korea, have taken the development of electric vehicles as an important national development strategy, and people ...

AI Technical Summary

Problems solved by technology

The power of wired charging is relatively large, and the process of taking power is not flexible. It is necessary to repeatedly plug and unplug the charging cable, which is prone to mechanical wear and tear, resulting in unsafe exposure of large current carriers. In rainy and snowy weather, moisture insulation treatment is required, and open-air charging cannot be realized; At the same time, the construction of charging piles and charging stations is similar to that of traditional gas stations. Due to the constraints of the construction site, the construction cost is very high; when metal is mixed into the magnetic field coupling area in the traditional wireless charging system, the metal will heat up sharply due to the eddy current effect, and there is a huge potential safety hazard.

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