Study On Electric Vehicle Lithium Battery Charger Based On Power Factor Correction With Dual Frequency

This article describes the background and significance of the study of ElectricVehicle (EV) charging system, introduced the development status and future trend of theEVs in the world range. In the development process of the EVs, the charging system isalways a very important part. The uncontrolled or phase-controlled rectifier is normallyused in the rectification part of the charging system, but the rectifier caused very serious‘harmonic pollution’ to the power grid. With the present of the ‘green energy’ concept,people focus on the research of the power ‘pollution source’ rectifier, Boost powerfactor correction is one of them, which can achieve sinusoidal waveform in the powergrid side of the rectifier, and improve the unity power factor.In this paper, focusing on the high request for the performance of the systems andthe great losses in switching as well as the higher requirement for the capacity of theelectric vehicle charger, the dual theory is applied to the system. Firstly, the principlesof dual Boost converter are introduced, and the main parameters arecalculated.Secondly several methods of Boost power factor correction converter areintruoduced.Through the comparative study, one cycle control is chosen as one methodof Boost power factor correction converter with dual frequency. One cycle control hasthe advantages of constant frequency control, simple control and dynamic response fast.IR1150S is chosen as Channel Decoder used in Boost power factor correction withdual frequency based on one cycle control in this paper,and the parameters of the mainand control circuit are designed.The simulation model of the converter is built byMatlab software. This converter has the approximate power factor correction effect withtraditional Boost power factor correction converter, but its efficiency has the promotioncompared with traditional Boost power factor correction.The Phase-Shift Full-Bridge converter of good property is widely used in the caseof low voltage and heavy current. Parallels a shunted capacity and appends a resonantinductor on the topology.The two arms of the converter all work at zero-voltageswitching condition, thus many advantages are brought out. For example, simplestructure, little loss of power, convenient control, etc. In this paper, the operationalprinciple of the converter is analyzed in detail, Small-Signal Model of the converter isderived from building Small-Signal Model of Buck converter. Finally, the controlsysterm of Dual Closed Loop is designed and simulated. This paper based on the charging theory, combined with the superiority of Boostconverter power factor correction with dual frequency and PS-FB-ZVS used in lowvoltage heavy current case, a electric vehicle lithium battery charger based on powerfactor correction with dual frequency is designed, and the parameters of the main andcontrol circuit are designed. The experimental results indicate that: The charger not onlyhas the function of power factor correction but also it can enhance the efficiency of thesystem, implement constant current and voltage charging.