pwm型半桥开关电源设计学位论文.doc

 PAGE II PWM型半桥开关电源设计 [摘要]开关电源是现代电力电子设备不可或缺的组成部分，其质量的优劣直接影响子设备性能，其体积的大小也直接影响到电子设备整体的体积。本设计根据设计任务进行了方案设计，设计了相应的硬件电路，研制了150W(15V、10A)板桥开关电源。整个系统包括主电路、控制电路和驱动电路三部分内容。系统主电路包括单相输入整流、半桥式逆变、高频交流输出，输出整流、输出滤波几部分。控制电路包括主电路开关管控制脉冲的产生和保护电路。论文具体地介绍了主电路、控制电路、驱动电路等各部分的设计及实验过程，包括元器件的选取以及参数计算。本设计中采用的芯片主要是PWM控制芯片SG3525A、光电耦合芯片PG817和半桥驱动芯片IR2110。设计过程中充分利用了SG3525A的控制性能，具有宽的可调工作频率，死区时间可调，具有输入欠电压锁定功能和双路输出电流。介绍了开关电源的相关知识，从开关电源的工作原理，组成，特点等方面进行阐述，把开关电源的分类，主要技术指标，典型结构，技术要点及其开关器件进行了系统的说明，同时在基于PWM技术的基础上。围绕高频变压器、PWM控制及驱动电路等模块，设计了一台功率为150W、输出电压为+15V的半桥式开关稳压电源，并给出了具体设计步骤。 [关键词]开关电源；半桥；SG3525A；高频变压器；MOSFET  Design of half Bridge Switching Mode Power Supply Based on PWM technology LI Qianguang (Grade 08,Class 2,Major Electric engineering, Electric engineering and automation Dept, Shaanxi University of Technology, Hanzhong 723003,Shannxi) Tutor: Yan Qunmin 【Abstract】Switching mode power supply (SMPS) is a significant part of the power electronics, which effects the performance and volume of the electronic equipment. The scheme has made a plan of designs based on the task of design, designed corresponding hardware circuit and developed 150W(15V、10A) half-bridge Switch power supply, it also can display voltage.The system included three parts: the main circuit part, the control circuit part and driving circuit. And the main circuit part consisted of one-phase input rectification. The control circuit involved two parts: One is the circuit brings the pulse controls the switches in main circuit, and the other is the protect circuit. And then detailedly recommended the designs of main circuit, control circuit and driving circuit, including selected components and calculated parameter. The CMOS chip that is applied in the design is PWM Controller SG3525、optical coupler Circuit PC817、half bridge drive chipIR2110. The controlled feature of PWM Controller SG3525A is fully utilized in the process of design, which has wide adjustable operating frequency and dead time, input under voltage lock function and