【作者】 李辉；

【导师】 房绪鹏；

【作者基本信息】 山东科技大学 ， 电力系统及其自动化， 2017， 硕士

【摘要】 电力电子技术的飞速发展,使得开关电源的性能不断提升,开关电源以优异的性能和相对低廉的价格应用在农业、工业、国防和日常生活等各个领域。开关电源在使用过程中会产生谐波,而其大量的使用会对电力系统产生严重的谐波污染,严重影响电力设备的正常运行。大量的谐波流过线路造成了能量的消耗。近年来,由电力电子设备产生的谐波对电力系统的污染日益受到重视。为较有效的改善电能质量,电力电子设备中通常采用功率因数校正(PFC)技术。现在的功率因数校正技术主要集中研究提升功率设备的功率密度和效率上,适用于中小功率场合的临界模式PFC(BCM),相对于连续模式(CCM),可实现二极管电流的过零点自然关断和开关管零电流开通。采用两相交错后,可以减少磁芯的体积,降低导通损耗,并且输入电流纹波大幅度的减少。本文简述了功率因数校正电路和双管正激电路的发展概况,针对两级式功率前级通常采用Boost电路拓扑的特点,将临界模式的功率因数校正电路与双管正激电路相结合,减少后级DC/DC变换器的电压应力。文中给出了交错Boost模式功率因数校正电路的原理,给出电路的参数设计,采用UCC28063和TL494制作了带PFC预调制的双管正激电源。PFC电感中不同时间段的开关频率和峰值电流不同,本文采用分段积分的方法,求得PFC电感的功率损耗。针对交错模式下PFC开关频率变化,小信号建模困难,本文采用电荷守恒的原理,简化了建模过程。更多还原

【Abstract】 With the rapid development of power electronic technology, the performance of switching power supply is rising, switching power supply with its excellent performance and relatively low price applied in agriculture, industry, national defense and other fields of daily life. Switching power supply in the use of the process will produce harmonics, and a large number of its use will produce serious harmonic pollution of the power system. In recent years, the harmonic pollution caused by power electronic equipment has been paid more and more attention.In order to improve the power quality, power factor correction (PFC)technology is usually used in power electronic equipment. The power factor correction technology mainly concentrated in the research of improving power density and efficiency of power equipment, Boundry conduction mode PFC (BCM)mainly be used in the small and medium power applications, can realize the diode current zero crossing off, and reduce the volume of the magnetic core inductor compared to the continuous conduction mode (CCM).This paper analyzes the development situation of power factor correction circuit and two switch forward circuits, aims to the characteristics of the two stage type power factor correction circuit, combining the power factor correction circuit and critical mode two switch forward converter. The first stage uses a constant turn-on time interleaved critical conduction mode power factor circuit to reduce the input current ripple and output capacitor ripple. In this paper,the principle of Boost mode power factor correction circuit is presented,and the parameter design of the circuit is given. The UCC28063 and TL494 are used to make the two switch forward converter with PFC pre modulation.The switching frequency and the peak current of the PFC inductor are different in different time periods. In this paper, the power loss of the PFC inductor is obtained by using the method of subsection integration. According to the change of PFC switching frequency,the small signal modeling is difficult. In this paper,the principle of charge conservation is used to simplify the modeling process.更多还原