Two circuits , characterized by high power factor and low output voltage , are proposed . one is originated from the concept of charge pump , and the other functions in the same principle with so - called buck - boost circuits 最后提出了两种功率因数校正的电路拓扑:一种是由电荷泵原理引出的;另一种是基于buck - boost原理工作的电路。
This paper with the help of the m file and simulink toolbox in the matlab simulate the buck - boost circuit system dynamicly . the large amount of dynamic simulation figures given in this paper verified the correction of the results of theoretical analysis 本文利用matlab中的m文件和simulink工具对buck - boost电路系统进行了动态仿真,改变系统中的各个参变量,观察并对比其动态变化规律,文中给出了大量的仿真图形,验证了理论分析的正确性。
In this dissertation , a novel bidirectional dc / dc converter ' s topology was designed , witch used in vehicle power supply systems . the converter is composed of fundamental bidirectional switch cell , using phase - shifted full - bridge zvs pwm dc / dc converter in buck circuit and using push - pull boost converter in boost circuit 文中从双向dc dc变换基本单元入手,针对某大型车载电源系统设计了一种新型双向dc dc变换器拓扑电路,降压变换采用移相全桥式zvs ? pwm功率变换,升压变换采用推挽式dc dcboost功率变换。
At first , buck - boost circuit is detailed analyzed and derived strictly in the theory , and on the base , the current of the inductance and the output voltage are analyzed elaborately . when the input voltage is the ac voltage with the nomal frequency , the two variable quantity are analyzed and some conclusions are concluded by means of equal length separation methods and introducing function methods and derivative - equation methods . and this is the basis of the next proceeding 首先,对buck - boost电路进行了严谨地理论推导,先对buck - boost电路在输入为直流电压时的工作情况进行了分析;在此基础上,对输入为工频交流电压时的电感电流、输出电压作了详细分析,利用等间距离散化方法、引入函数法、微分方程法分别对变量进行了推导和总结,为下一步工作奠定了理论基础。