1、 摘 要 随着开关电源在计算机、通信、航空航天、仪器仪表及家用电器等方面的广 泛应用, 人们对其需求量日益增长, 并且对电源的效率、体积、重量及可靠性等 方面提出了更高的要求。开关电源以其效率高、体积小、重量轻等优势在很多方 面逐步取代了效率低、又笨重的线性电源。电力电子技术的发展，特别是大功率 器件 IGBT 和 MOSFET 的迅速发展，将开关电源的工作频率提高到相当高的水平， 使其具有高稳定性和高性价比等特性。 开关电源技术的主要用途之一是为信息产 业服务。信息技术的发展对电源技术又提出了更高的要求，从而促进了开关电源 技术的发展。 开关电源的高频变换电路形式很多, 常用的变换电路有推挽
2、、 全桥、 半桥、单端正激和单端反激等形式。本论文是基于芯片 UC3842 的小功率高频开 关电源系统设计。 关键词关键词：开关电源； 半桥； 全桥； 推挽； 高频变压器 ABSTRACT With the switch power source extensive use in the field of computer, communicate by letter, aeronautics and astronautics, instrument appearance and domestic appliances etc., people increases by gradually t
3、o whose need amounts, have brought forward higher request to aspect such as power source efficiency, bulk factor and reliability. The switch power source is small with its efficiency height volume， weight makes light of to wait for advantage to have substituted the inefficient , both stupid and seri
4、ous linearity power source in many aspects step by step. The electric power electronic technology development, specially high efficiency component IGBT and the MOSFET rapid development, enhances the switching power supply operating frequency to the quite high level, enable it to have the high stability and GaoXingjia compares and so on the characteristic. One of switching power supply technology main uses is serves for the information industries. The information technology development also set
