High-power induction charging converter of electric vehicle and control method thereof

Abstract

The invention provides a high-power induction charging converter of an electric vehicle and a control method thereof. The converter comprises a three-phase fully-controlled bridge rectifying circuit, a full-bridge inverter circuit and an inductive coupling circuit which are connected in sequence, wherein each phase at the alternating current (AC) side of the three-phase rectifying circuit is connected with a reactor (1), the three-phase rectifying circuit is a three-phase fully-controlled bridge rectifying circuit (2), and the positive end and the negative end of the direct current (DC) side of the three-phase rectifying circuit are connected with one DC storage capacitor (3); an inverter circuit is a full-bridge inverter circuit (4), an input end of the full-bridge inverter circuit (4) is connected with two ends of the DC storage capacitor (3), and an output end of the full-bridge inverter circuit (4) is connected with the primary side of a loosely-coupled transformer (6) in the inductive coupling circuit; and a serial compensation capacitor (5) of the inductive coupling circuit is connected with the primary side of the loosely-coupled transformer (6), and the secondary side of the loosely-coupled transformer (6) is connected with a secondary compensation capacitor (7) in parallel, thus storage batteries are charged by converting AC into DC via a secondary rectifier bridge (8). The converter is used for a charging station so as to finish a high-power non-contact induction charging function of the electric vehicle.

Description

technical field [0001] The invention relates to an inductive charging device capable of providing relatively large charging power for an electric vehicle, belonging to the technical field of power electronics applications. Background technique [0002] Since its invention, electric vehicles have become a model of low-carbon and environmental protection, and have the potential to replace traditional fossil fuel vehicles. Although the traditional contact charging device has the advantages of simple topology and convenient use, it directly connects the plug to the car. Due to the exposed wires, it is easy to generate contact sparks, and the mechanical wear caused by repeated plugging and unplugging leads to loosening of the plug and rain and snow. The weather has to carry out indoor operation and other problems, which is likely to bring potential safety hazards to the operator on the insulation. [0003] For this reason, the induction method of electric vehicles was proposed i...

AI Technical Summary

Problems solved by technology

Its outstanding feature is that the power-frequency AC power is converted into DC power through a three-phase rectifier, and then the DC power is converted into high-frequency AC power through a full-bridge inverter, and then the AC power is transmitted to the secondary circuit through a loosely coupled transformer. The transformer is a loosely coupled transformer with a low coupling coefficient, and the transmission efficiency is low. Therefore, it is necessary to convert the power frequency alternating current into high frequency alternating current, reduce the volume of the coupling transformer, and compensate the primary and secondary sides of the coupling transformer to increase the power. transmission efficiency

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