In this thesis , the tradition phase - shift full - bridge zvs dc / dc converter are analyzed , and then a new dc / dc full - bridge converter employing switches clamping in secondary side of transformer is proposed , and the converter employing saturable inductor clamping are studied , and zvs ( zero - voltage - switching ) can be easily achieve by experiment validate 本文分析了一些传统的移相全桥软开关变换器，提出了开关管箝位dc dc全桥变换器拓扑方案，并对饱和电感器箝位dc dc全桥变换器进行了研究，并进行实验验证，从而解决了开关管的零电压开关问题。
Buck zvs - mr - tl converter is taken as the examples to illustrate the operation of the zvs - mr - tl converters . the operation of buck zvs - mr - tl converter is analyzed as well as parameter design , realization of pulse - frequency - modulation ( pfm ) interleaved control and comparison between zvs - mr converters and zvs - mr - tl converters . a 1000w prototype converter is built in the lab to verify the effectiveness of the proposed converter 本文以buck零电压开关多谐振三电平变换器为例，详细分析了它的工作原理、参数设计、脉频调制交错控制的实现、与常规的多谐振变换器的对比，并以一个1000w的原理样机对该变换器进行实验验证。
Among them , phase shifted ( ps ) full bridge ( fb ) zero - voltage - switched ( zvs ) pulse - width - modulated ( pwm ) dc / dc converter has strong competitive power in big power capacity fields . but it has some limitations such as smaller load range with zvs and larger circulation energy . the ps - fb - zvs - pwm dc / dc converter with a saturable inductor utilizes saturable inductor s critical saturable current characteristic and storage energy , to enlarge load range with zvs and improve output efficiency under light load 其中，移相控制零电压开关脉宽调制dc / dc全桥变换器在大容量领域很有竞争力，但它具有实现零电压开关负载范围小，循环能量大等限制，带饱和电感的移相控制零电压开关全桥变换器利用饱和电感的临界饱和电流特性及储能，来扩大零电压开关( zvs )的负载范围，提高轻载时的输出效率，具有非常重要的研究价值。
Abstract : on the basis of analyzing the current some kinds of resonant snubber and soft switched circuits , a new type of single phase commuted resonant snubber and its control method are implemented . since the resonant snubber can achieve soft switch condition for the inverter when only single phase is commuted , the control method of the inverter is very similar to the normal inverter . it is proved that the simulated results well agree with the circuit topology and the control method 文摘:在分析目前软开关电路以及谐振缓冲器的发展现状基础上，提出了一种具有单相换相特点的谐振缓冲器，在其作用下，逆变器工作在零电压开关环境下.论文分析了所设计的谐振缓冲器的工作原理以及控制规律，仿真结果证明了电路拓扑以及控制方案的可行性
A current - doubler - rectifier ( cdr ) zvs pwm ( half - bridge ) three - level converter is proposed in this paper . zvs can be achieved for all the switches in a wide load range with the use of the energy stored in the output filter inductances . the output rectifier diodes commutate naturally without voltage oscillation and voltage spike 针对传统(半桥)三电平直流变换器的一些不足，本文提出一种倍流整流方式pwm零电压开关三电平直流变换器，可以使开关管在全负载范围内实现零电压开关，副边整流二极管无电压尖峰，无占空比丢失。
The main circuit of the design in this article we used is fb zvs pwm dc / dc converter , full bridge zero voltage switching pulse width modulation dc / dc converter , which is a full bridge circuit composed of four power switches using resonance to implement zero voltage when turning - on or turning - off 本文设计的通信电源充电模块的主电路采用的是fbzvspwmdc dc变换器，即全桥零电压开关脉冲宽度调制的直流变换器，它是由4个功率开关管组成的全桥电路，利用谐振使每个开关管在零电压的条件下完成导通和关断。
The zero - voltage - switching ( zvs ) pwm hybrid full - bridge three - level ( h - fb tl ) converter can operate in both three - level mode and two - level mode , the output rectified voltage is close to the output voltage over the entire input voltage range , thus the output filter can be reduced significantly , leading to high power density and fast dynamic response . so the zvs pwm h - fb tl converter is very attractive for the applications such as fuel cells , photovoltaic cells , and telecom power supplies , where the voltage varies in a wide range 零电压开关复合式全桥三电平( zero - voltage - switchingpwmhybridfull - bridgethree - level , zvspwmh - fbtl )变换器可以工作在三电平模式和两电平模式,在很宽的输入电压范围内,输出整流电压都接近输出电压,从而可以减小输出滤波器,因此可以提高变换器的功率密度和改善动态性能。
The following is the main point : based on the operation principle of the ps - fb - zvs - pwm dc / dc converter , the thesis researches the transient operation of the ps - fb - zvs - pwm dc / dc converter with a saturable inductor , and comprises the characteristic between them , and verify theory analysis above by computer simulations 本论文研究的主要内容如下：论文在分析移相控制零电压开关全桥变换器工作原理的基础上，对带饱和电感的移相控制零电压开关全桥变换器的暂态工作过程进行了研究，并对它们之间的特点进行对比，仿真验证了上述理论分析。
Firstly , the basic theory of full - bridge phase - shift zvs pwm converters are expatiated and another three kinds of circuits of full - bridge phase - shift zvs pwm converters are discussed . there are four kinds of problems which are emphasized : how to expand the zvs range ; how to reduce the circulation in the primary side of the transformer in order to minimize the on state losses ; how to decrease the loss of effective duty circle and how to eliminate the parasitic oscillation of the output rectifiers 本文首先分析了基本的全桥移相zvsdc dc变换器的工作原理，为解决滞后桥臂不易实现零电压开关( zvs )的情况，讨论了另外三种全桥移相zvsdc dc变换器的电路拓扑，重点分析并解决了四个方面的问题：如何扩大zvs的负载范围；减小变压器原边环流，降低变换器系统通态损耗；减少变压器次边有效占空比丢失；消除输出整流二极管的寄生振荡。
The thesis analyses the effect of phase shift control and the utilization of the transformers primary sides saturable inductor to the transformers secondary sides voltage duty cycle , and basic on the buck converter s small signal ac model the converter s model is deserved , and infers control to output transfer function 论文通过分析移相控制方式和高频变压器一次侧的饱和电感对高频变压器二次侧方波电压占空比的影响，在buck变换器小型号模型的基础上建立了带饱和电感的移相控制零电压开关全桥变换器的小信号模型，推导出控制到输出的小信号传递函数。
