彩色电视机开关电源的设计.doc

洛 阳 理 工 学 院 毕 业 设 计（论 文） 题目 彩色电视机开关电源的设计 姓 名 系 （部） 电气工程与自动化系 专 业 电气自动化技术 指导教师 2012年 5 月 12 日 彩色电视机开关电源的设计 摘要 虽然开关电源起步比较晚，但是在近几十年电力电子技术飞速发展的推动下，使得开关电源的到了飞速的发展。由以前几十千HZ的频率到现在的几百千HZ，由以前得低效率到现在的高效率（最高可以达到95%），开关电源的功率也在不断的加大。这些变化使得开关电源在邮电通讯仪仪器工业设备医疗电领应设计中开关电源是采用DC-DC变换电路主要有两大部分组成：主回路和控制回路——主回路是将交流电通过变压整流滤波给负载的电路，控制回路是通过UC3843的相互配合来产生PWM波形按输入输出条件控制主回路工作状态。 ABSTRACT Although switching power supply started quite late, but in recent decades, power electronic technology rapid development, makes the retreat move of switch power supply to rapid development. By previously dozens of thousands of hundreds of thousands HZ to now HZ, by previously gets lower efficiency to the present high efficiency (up to 95%), switching power supply power is also in constant increase. These changes make switching power supply in telecommunications, instrument, industrial equipment, medical equipment, household appliances etc widely used. This design based on the switch power source design A 12V, 1.5 A, 24V, 10, frequency voltage adjustment for 80KHZ, rate high, with the current protection, adopt PWM control two road dc voltage stabilizer. Design of switching power supply is the positive separate-excited DC - DC converter to design circuits. Circuit basically has two main components: the main circuit and control circuit - the main loop is ac utility through EMI, variable pressure, rectifier, filtering, etc, and finally the circuit, transported to load control loop TL431, PB817, is through the UC3843 together to produce PWM waveform press input/output control of conditions of main loop switch tube working condition to adjust the size of the output voltage of the circuit. Key words Forward multi-channel dc voltage stabilizer power supply；Transformer；Safety；Input circuits；Output circuits1.1 开关电源的分类............................................................................. 1.2 开关电源的基本工作原理............................................................ .... ..... 2章 开关电源电路中主要元器件介绍