Vehicle charging converter with high efficiency

Abstract

The invention discloses a vehicle charging converter with high efficiency. The vehicle charging converter with high efficiency includes successively connected EMI circuit, a PFC circuit, an inversioncircuit, a rectification circuit, an output circuit and a control circuit, wherein the EMI circuit is used for reducing the influence of high frequency noise of the converter on the power grid; on thepremise of guaranteeing the quality of the input current, the PFC circuit can convert the single phase alternating current into the high voltage direct current; the inversion circuit converts the high voltage direct current into high frequency square wave which is adjustable in frequency; the rectification circuit performs rectification after performing transformer isolation of the rectificationcircuit to obtain stable direct current voltage; and finally the high frequency current ripple is filtered and then is output by the output circuit, and the control circuit completes acquisition, calculation and output of the controlled quantity of the converter, and then operating and protection of the vehicle charging converter can be realized. In the vehicle charging converter with high efficiency, the PFC circuit and the inversion circuit respectively use GaN HEMT and Si MOSFET as the main switch devices; by means of combination with the advantages of a wide-gap semiconductor device and atotem PFC topology, the vehicle charging converter with high efficiency has the advantages of being good in the grid side harmonic wave characteristic, being small in volume, being flexible in control, and greatly improving the conversion efficiency of vehicle charging.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and more particularly relates to a high-efficiency vehicle-mounted charging converter. Background technique [0002] The on-board charging converter is a device installed on the electric vehicle to convert the electric energy of the public grid into the DC power required by the on-board energy storage system and charge the on-board energy storage system. my country has promulgated relevant standards for the national automobile industry, and has made requirements for technical indicators such as input current harmonic content, power factor, conversion efficiency, and protection characteristics of on-board charging converters. In order to meet the requirements of technical indicators, the on-board charging converter mainly adopts a two-stage topology: the front-stage non-isolated AC-DC converter is used to realize power factor correction and output a stable DC bus voltage, and the rear-st...

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Problems solved by technology

[0006] Aiming at the defects of the prior art, the object of the present invention is to provide a high-efficiency vehicle-mounted charging converter, aiming to solve the problems of low conversion efficiency, low power density and complex control system of the vehicle-mounted charging in the prior art

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