Semiconductor convertors - general requirements and line commutated convertors - self - commutated semiconductor converters including direct d . c . converters 半导体变流器.一般要求和线路换向变流器.包括直流变换器的自换向变流器
The analysis reveals that single - switch converter can not be converted into tl topology by the basic method because of its asymmetry 分析表明，由于单管直流变换器结构的不对称性，无法使用基本变换方法对其进行三电平拓扑变换。
The three - level ( tl ) topology derivation is a method to reduce the voltage stress of each switch in the converter by increasing the number of switches 直流变换器的三电平拓扑变换是一种通过增加开关管的数量来降低变换器中每只开关管电压应力的方法。
The method and its modification make the converter have higher input voltage and / or higher output voltage , and thus widen the application range of the converter 应用这种方法，可以拓宽各种直流变换器的应用范围，使之应用于输入电压或(和)输出电压更高的场合。
This thesis focuses on the development of the dc / dc stage , which adopted the phase - shifted zero - voltage - switching ( zvs ) pwm full - bridge converter with two clamping diodes 本文主要研究单相静止变流器的dc / dc级,它采用加箝位二极管的移相控制zvspwm全桥直流变换器。
Finally , the operation principle of three - level shift phase pwm control with zero voltage is validated by the simulation analyze and the debugging experiment of 230v / 10a sample device 最后，通过仿真分析以及对230v / 10a样机的调试实验，验证了零电压三电平移相控制pwm三电平直流变换器的工作原理。
There are two kinds of secondary power supply in high - voltage dc electric system , one is dc / dc converter that converts 270vdc to 28vdc , the other is static converter that converts 270vdc to 115vac / 400hz 它的二次电源有两种，一种是把270vdc变换为28vdc的直流变换器，另一种是把270vdc变换为115v 400hz交流电的静止变流器。
Then two kinds of simple passive lossless soft switching cells , which are applicable to non - isolated multilevel converters , are introduced in the thesis . their operation process is analysed in detail with figures and equations 然后对适用于多电平非隔离直流变换器的两种最简无源无损软开关单元电路的工作过程进行了详细的分析与推导。
Several tl converters are classified from papers of recent years , the basic method of tl topology derivation is obtained , which can be used to deduce the other kinds of tl topologies 本文首先归纳了文献中提到的几种三电平直流变换器，从中总结出了一种三电平拓扑的基本变换方法，应用这种基本方法及其改进方法得到了其它一些直流变换器的三电平拓扑。
The push - pull tl converter can be deduced by using the basic tl topology derivation and by special derivation only used in this topology , in which , the voltage stress of each switches is input voltage 应用三电平拓扑的基本变换方法，经过对该拓扑结构的特殊变换，得到了推挽三电平直流变换器的拓扑，其开关管的电压应力为输入电压，与传统推挽直流变换器相比，电压应力降低了一半。
