Novel charger circuit of electric automobile power battery

Abstract

The invention provides a novel charger circuit of an electric automobile power battery, which comprises a Z-source AC(alternating current) / AC inverter, a Pi-type filter circuit and an uncontrollable rectifier bridge which are connected in sequence. The Z-source AC / AC inverter is used for converting an alternating voltage, and comprises a Z-source network and two switch elements S1 and S2; one end of the switch element S1 is connected with an AC power supply, while the other end is connected in series with the Z-source network; the switch element S2 is connected in parallel with the Z-source network 11 and connected with the Pi-type filter circuit by a small inductor L0; the Pi-type filter circuit is used for filtering ripple waves in an output voltage, and comprises an inductor Lf and a first capacitor Cf1 and a second capacitor Cf2, which are connected in parallel with the inductor Lf respectively; and the uncontrollable rectifier bridge is connected with the Pi-type filter circuit and used for rectifying an AC signal output by the inverter. The novel charger circuit has the advantages of simple structure, convenience in control, large range of voltage regulation and high speed of voltage regulation, can relieve impact and inhibit harmonic wave, and is suitable for charge application of the electric automobile power battery.

Description

technical field [0001] The invention relates to a charger circuit, in particular to a novel electric vehicle power battery charger circuit used for charging electric vehicle power batteries. Background technique [0002] Electric vehicles are popular for their advantages of low pollution, low noise, high energy efficiency and diversified energy sources, and have become one of the development directions of the modern automobile industry. At present, electric vehicles have made breakthroughs in many important technical fields and are close to the stage of practical application. As one of the strategic topics being cultivated and developed, electric vehicles are the development direction of the future automobile industry and the goal of the automobile industry revolution. Governments around the world have given major support to the development of electric vehicles and formulated relevant development plans. Power companies in various countries have also Actively participate in ...

AI Technical Summary

Problems solved by technology

At present, the typical topological structure in traditional chargers is a two-stage structure, which is composed of a PWM AC / DC inverter and a DC / DC chopper circuit. However, this topological structure has application defects, especially due to The single-arm conduction problem caused by electromagnetic interference and other reasons will reduce the charging efficiency of the other two stages of power electronic conversion devices

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