文档介绍：摘要
随着全球对绿色环保问题的不断关注和开关电源在电气电子各个领域中的优良表现, 社会对其的需求量在不断的加大, 开关电源也因为其高效率、小体积、轻重量等多方面的优势在很多领域逐步取代了传统的连续工作的线性电源,但同时人们对这种电源的效率、体积、重量、功率因素及可靠性等方面提出了更高的要求。开关变换器的高频化、集成化、小型化、低噪声化、高可靠性化发展也是当今社会的不断追求和努力的方向,目前,开关技术的研究热点主要有新型高频高功率半导体器件开发,外围新器件的开发,同步整流技术优化,电磁兼容优化,高性能数字控制,拓扑结构和参数的最优化,低电压,大电流电源的开发等方面。随着研究的不断深入和电力电子技术的迅速发展,开关电源的工作频率,效率将不断提高,体积将不断减小,性能将更加稳定,品种也将越来越多。
近年来开关电源的高频变换器出现了推挽、全桥、半桥、单端正激和单端反激等多种形式,新型的软开关控制技术也有零电压和零电流两种。本文介绍了一款基于UC3825的小功率移相全桥零电压软开关控制方式的开关稳压电源,采用市电供电,带隔离变压器,给出了DC-DC变换器、PWM控制及驱动电路的详细设计方法及设计思路,并使用ORCAD/Pspice软件对开关电源主电路系统性能进行了仿真,根据仿真结果显示,该开关稳压电源效率高,输出电压稳定,电路设计较完善,性能稳定。[1]
关键词:开关电源移相全桥软开关技术
Abstract
With the global keeping attention on the problem of environmental protection and the switching power supply has good performance in all fields of electrical and electronic, the demands of switching power supply keep of its high efficiency, small size, light weight, and many other advantages, the switching power supply gradually replace the traditional linear power in many fields. But people need higher requirement for the efficiency, volume, weight, power factor and reliability of the switching power supply. The high frequency, integration, small size, low noise, the main research of switching technology focus on development of new high-frequency high-power semiconductor device and new external devices, the optimization of synchronous rectification technology and patibility, high performance digital control, topology and parameter optimization, low-voltage and high-current power supply development and so on. Along with the deepening of the study and the rapid development of power electronics, switching power supplies operating frequency, efficiency will continue to increase, the volume will continue to decrease, the performance will be more stable, the variety will be more and more.
In recent years, there are push-pull, full bridge, the new soft-switching control technology has zero voltage and zero current. The thesis describes a switchin