全桥稳压电源课程设计.doc

电力电子课程设计说明书 题 目：全桥型开关稳压电源设计 院 、 部： 电气与电子工程信息学院 学生姓名： 指导教师： 肖文英 职称 副教授 专 业： 电气工程及其自动化 班 级： 完成时间： 摘 要 该课程设计是利用PWM技术的全桥型开关稳压电源。给出了全桥整流电路、逆变电路驱动电路、控制电路的具体设计方法。该全桥开关稳压电源输出电压恒为48V，并有实验仿真波形。本全桥型开关稳压电源最大功率达1000W，输出电流约为20A，设计采用了AC／DC／AC／DC变换方案。一次整流后的直流电压，经过有源功率因数校正环节以提高系统的功率因数，再经全桥变换电路逆变后，由高频变压器隔离降压，最后整流输出直流电压，在设计中首先画出主电路图，主电路图由整流电路、逆变电路组成。全桥电路的开关元件使用的是MOSFET。全桥移相电路采用UC3875控制芯片，并作数据处理，MATLAB仿真作出了不同角度的仿真波形图。并说明其工作原理，再通过基本计算，选择触发电路和保护电路的结构以及晶闸管的型号和变压器的变比及容量，完成本设计的任务。 关键词 ：开关电源；全桥；PWM控制电路；整流；逆变；高频变压器 ABSTRACT The class is full bridge switch regulated power supply based on PWM technology. The design method of the full bridge rectifier circuit, the inverter circuit, the driving circuit and the control circuit are presented.. The output voltage of the full bridge switching voltage regulator is constant to 48V and has the experimental simulation waveforms. The full bridge switch regulated power supply maximum power up to 1000W, output current is about 20a, designed using AC / DC / AC / DC converter scheme. A rectified DC voltage, by means of active power factor correction link to improve the power factor of the system, again after full bridge converter inverter circuit, by the high frequency transformer isolated buck, the output DC voltage, in the design of the first draw the main circuit, the main circuit comprises a rectifier circuit, inverter circuit. The switching element of the whole bridge circuit is MOSFET. The full bridge phase shifted circuit uses UC3875 control chip, and data processing, MATLAB simulation to make a different angle of the simulation waveforms. And explain its working principle, again through the basic calculation, select trigger circuit and protection circuit structure and thyrisor model and transformer ratio and capacity, complete the design task. Keywords: switching power supply; full bridge;PWM control circuit; rectif