Three-phase PFC rectifying device of high-power charging pile with boost-buck function for electric cars and control method

Abstract

The invention relates to a three-phase PFC rectifying device of a high-power charging pile with a boost-buck function for electric cars and a control method. The device comprises a rectifying module,a boost-buck module, a sampling module, a hardware voltage and current detection module, a comparator module, a DSP module and a protective switch tube driving module, wherein three-phase network voltage is connected with the rectifying module through pin output ends UA, UB and UC, and the rectifying module and the boost-buck module form a three-phase eight-switch buck-boost rectifier. In the three-phase PFC rectifying device, the three-phase eight-switch buck-boost rectifier is used as a main circuit topology, and double closed loop control is adopted, so that the input current is close to asine wave, the input current and the input voltage are cophasal, and the power factor approximates to 1; the structure is simple, the size is small, the grid-side power factor is high, and the charging efficiency is high; besides, the direct-current side is connected with the buck-boost topology, the output voltage can be flexibly adjusted according to the type of an electric car at the output end, different requirements for the output voltage are met, and the electric cars of different types can be quickly charged.

Description

technical field [0001] The invention relates to the technical field of electric vehicle battery charging, in particular to a three-phase PFC rectifier and a control method of a high-power charging pile for electric vehicles with voltage-boosting functions. technical background [0002] With the development of human beings, people have to pay attention to the increasingly prominent energy and environmental issues, and electric vehicles are powered by electric energy, which can not only solve the pollution problem of fuel vehicle exhaust emissions, but also reduce the consumption of fossil energy. Therefore, it is gradually favored. Now the number of electric vehicles in my country only accounts for 0.2% of the total number of vehicles, which has great development prospects, and convenient and fast charging facilities can greatly promote the popularization and promotion of electric vehicles. [0003] At present, the charging facilities of electric vehicles can be roughly divid...

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Problems solved by technology

[0008] The main purpose of the present invention is to provide a three-phase PFC rectifier and control device for a high-power charging pile of an electric vehicle with a buck-boost function in order to solve the defects of the prior art that the volume is too large, the output voltage cannot be flexibly adjusted, and the charging efficiency is low. method, to overcome the deficiencies of the above-mentioned prior art

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