低压大电流高频开关电源的研究与设计

发布时间：2018-02-11 04:54

本文关键词： 低压大电流有源钳位软开关交错并联Buck 高频变压器　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：电源作为电子设备的基本动力源正经历着不断的发展和改进,为满足IC芯片电压越来越低、电流越来越高、低损耗、高效率、高功率密度等发展要求,研究高性能的绿色开关电源已成为电源的发展趋势。本文设计了一款48V输入、1.2V/220A输出的两级式变换器,电路拓扑结构采用“有源钳位正激+多相交错并联Buck”。将软开关技术与PWM控制技术相结合运用于有源钳位ZVS-PWM正激变换器的设计,该变换器实现并满足了主开关管ZVS开通的要求,变压器的磁化能量实现了循环利用。主电路中变压器的副边采用自驱动同步整流技术,使得电路整流损耗与总损耗的比值低50%,有效降低了系统的总损耗。高频变压器磁芯材料的特性参数,形状及外形尺寸等相关参数的优化设计,降低了变压器的损耗,提高了系统变换器的效率。采用四相交错并联同步Buck电路解决了单个同步Buck变换器中整流管电压、电流应力大、效率低等问题,电路的输出电流纹波得到了减小,可靠性和功率密度得到了提高,电路实现了N+n的冗余特性。利用软件Saber和MATLAB对系统进行了相关的建模和仿真,验证了系统结构设计和电路详细设计的可行性和正确性。仿真结果及其数据分析表明,变换器具有低损耗、高效率、功率密度高、纹波系数小等优点,电源效率可达到85%以上,输出电压和输出电流纹波系数均小于0.2%,各项性能指标均可满足并达到所需电源设计的要求。
[Abstract]:As the basic power source of electronic equipment, power supply is undergoing continuous development and improvement. In order to meet the development requirements of IC chip, such as lower voltage, higher current, lower loss, higher efficiency and higher power density, etc. Research on high performance green switching power supply has become the trend of power supply. In this paper, a 48V input 1.2V / 220A output two-stage converter is designed. The circuit topology adopts "active clamp forward multiphase interleaving parallel Buck". The soft switching technology and PWM control technology are combined in the design of active clamp ZVS-PWM forward converter. The converter realizes and meets the requirements of ZVS switch on. The magnetization energy of the transformer can be recycled. In the main circuit, the secondary edge of the transformer adopts the self-drive synchronous rectifier technology. The ratio of rectifier loss to total loss of circuit is reduced by 50%, and the total loss of the system is effectively reduced. The optimization design of characteristic parameter, shape and shape size of magnetic core material of high frequency transformer reduces the loss of transformer. The efficiency of the system converter is improved by adopting four-phase interleaving parallel synchronous Buck circuit to solve the problems of rectifier voltage, high current stress and low efficiency in a single synchronous Buck converter, and the output current ripple of the circuit is reduced. The reliability and power density are improved, and the redundancy of N _ n is realized by the circuit. The software Saber and MATLAB are used to model and simulate the system. The simulation results and data analysis show that the converter has the advantages of low loss, high efficiency, high power density and low ripple coefficient, and the power efficiency can reach more than 85%. The ripple coefficients of output voltage and output current are less than 0.2. Each performance index can meet the requirement of power supply design.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

【相似文献】