220V5A直流操作电源的设计.doc

摘 要 电能己经成为现代人们生活当中不可缺少的动力源，电力系统的运行必须安全、可靠，这样才能保证供电的正常，直流电源系统作为变电站电力系统的保障，也就必须稳定可靠。而高频开关电源因其性能可靠、效率高、寿命长等优点，成为了现代电力操作电源系统中的重要组成部分。 该系统以IGBT作为功率开关器件，构成全桥开关变换器，整个电源由输入电路、功率因数校正器、主逆变器、输出滤波电路等部分组成。系统主电路逆变部分采用了脉宽调制技术（PWM），PWM信号由集成控制器TL494产生，从输出端实时采样电压、电流反馈信号，以控制输出电压和电流的变化。IGBT驱动电路采用单独的集成驱动器控制器M57962L进行驱动。控制电路和主电路之间通过变压器进行隔离，提高了系统的可靠性和安全性。 由于模块工作于高频开关状态，系统具有体积小、重量轻、可靠性高、负载分担容易等一系列优点，从而解决了传统的相控整流存在的输出电压纹波大，谐波污染严重，转换效率低，系统体积庞大等缺点。 关键词：校正装置；控制电路；高频开关电源。 Abstract Electricity energy has become more and more important in daily life.Power system must work safe and reliable to insure the normal of power supply system.So DC power system must work reliable,which is the core of power system,transformer substation. High frequency switching power supply adopting soft switching technology,which has reliable high efficiency and long use time performances becomes the important part of DC power system. The full-bridge converter is made up of four IGBT. The system consists of the AC input stage,main inverter,output low-pass filter,etc.The theory of PWM is used in the system,and single of PWM is offered by controller TL494.The feedback voltage and current achieved from output is used to control the change of the output.The controller M57962L is used in the IGBT drive-circuit.The primary circuit and the control circuit are insulated by the transformer,increasing the reliability of the system. Because of the high frequency operation,this switching mode power supply has many advantages:light weight,small physical size, high reliability,etc. Conventional charge and discharge modular uses phase control rectification technology,which brings big change of output voltage,interrupt of electrical magnetic,low efficiency, and large size. Key words: Correction devices;Control circuit;High-frequency switching power supply. 目 录 摘要 Ⅰ Abstract Ⅱ 1 绪论 1 1.1 开关电源的研究背景 1 1.2 开关电源的发展 1 2 开关电源的简介 4 2.1 开关电源的分类 4 2.2 开关电源的工作原理 5 3 开关电源的电路结构分析与比较 6 3.1 电源变换器 6 3.2 开关电源的控制方法 9 4 开关电源主电路的设计 11 4.1 设计任务的技术指标