Three-phase wireless charging system and charging method for electric automobile

Abstract

The invention discloses a three-phase wireless charging system and a three-phase wireless charging method for an electric automobile, and belongs to a wireless power transmission system and a wireless power transmission method. The wireless charging system consists of a primary power supply device, a secondary charging device and a digital control unit, wherein the primary power supply device is arranged under the ground, the output end of the digital control unit is connected with the primary power supply device, and the secondary charging device is arranged on the automobile; a magnetic energy emitting array type coil in the primary power supply device is connected in series with a coil current detecting unit; and the output end of the coil current detecting unit is connected with the input end of the digital control unit. The system has the advantages that a primary magnetic energy emitting mechanism consists of the matrix array type coil, so that reliable charging of the electric automobile is ensured in a large range; by setting the winding direction of the primary array type coil, a zero point of secondary coil pickup voltage is avoided; and only one power supply group consisting of three adjacent primary coils closest to a secondary pickup coil supplies power is available for supplying power each time, so that other coils are prevented from running in an idle mode, and the efficiency of the whole system is improved.

Description

technical field [0001] The invention relates to a wireless energy transmission system and method, in particular to a three-phase wireless charging system and a charging method for an electric vehicle. Background technique [0002] The rapid increase of car ownership in modern cities not only causes urban road congestion and produces a lot of noise, but also the continuous increase of exhaust emissions will definitely cause serious greenhouse effect and air pollution. With the increasing energy crisis and the continuous improvement of human requirements for the living environment, in addition to vigorously promoting the energy saving and emission reduction of traditional automobiles, the development of electric vehicles with low noise and zero pollution emissions will undoubtedly have a positive effect on reducing the pollution caused by automobiles to the urban atmosphere. significance. [0003] At present, there are mainly two charging methods for electric vehicles. Ordi...

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Problems solved by technology

[0003] At present, there are two charging methods for electric vehicles, ordinary AC Direct charging mode: In this charging mode, the charging time is long and the charging efficiency is low; In this mode, the charging time is short and the charging efficiency is high, but the charging load is large, so it is not suitable for multiple cars to charge at the same time

Although many countries in the world have invested a lot of money in the construction of large-scale and efficient electric vehicle charging stations, there are still some problems in the following aspects when looking at the development of electric vehicle charging technology and the construction of charging stations at home and abroad: Electric vehicle charging stations take a long time to charge, which wastes a lot of time for consumers; A charging station can charge a limited number of cars at the same time; Outdoor wired charging piles are vulnerable; Building dedicated charging stations takes up a lot of land, etc.

However, using the traditional single-phase single-primary-side transmitting coil wireless power transmission system to realize wireless charging for electric vehicles, there is an obvious defect: the magnetic field generated by the primary-side magnetic energy transmitting coil is unbalanced, the magnetic field strength at the center of the coil is large, and the surrounding magnetic field strength is large. Small

Otherwise, it will cause a large loss of energy, which is not conducive to the efficient charging of the battery

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