Compared with those converters that need an auxiliary switch to make the main switching device working in soft - switching condition , the converters this paper present , are simple , easily controlled and cost less , but still maintain the merits of soft - switching for the main switching devices 这些变换器与那些需要辅助开关来实现主开关的软开关工作的变换器相比，具有结构简单、易于控制、成本较低的优点。所提出的新型功率因数校正软开关变换器除具有以上优点外，还能有效解决二极管的反向恢复所带来的问题。
The converter not only keeps all the characteristics of the basic zvs pwm h - fb tl converter , but also eliminates the voltage oscillation and voltage spike across the rectifier diodes in both three - level mode and two - level mode , leading to a reduced voltage stress of the rectifier diodes 本文在基本zvspwmh - fbtl变换器中引入两只箝位二极管,无论是在三电平模式还是在两电平模式,都可以消除输出整流二极管反向恢复造成的电压尖峰和振荡,降低了输出整流管的电压应力。
A current - doubler - rectifier ( cdr ) zvs pwm h - fb tl converter is proposed in this paper , the proposed converter can achieve zvs for all the switches in a wide load range with the use of the energy stored in the output filter inductance , in the meanwhile , the voltage oscillation and voltage spike across the rectifier diodes resulted by the reverse recovery are eliminated 为了消除输出整流二极管反向恢复造成的的电压尖峰和振荡,同时使所有开关管在很宽的负载范围内实现zvs ,本文提出了倍流整流方式的zvspwmh - fbtl变换器。
The sample with low emitter efficiency has completed as the method of above . this lead to the greatly decrease of the reverse recovery time and the low reverse leakage and forward voltage , especially the excellent temperature character of the leakage . the test date shows that the samples reach the first class of international level 本论文作者通过仿真测试,验证了课题研究的理论设想,并设计制作了具有低阳极发射效率结构的高压功率frd ,利用局域铂掺杂和电子辐照相结合的寿命控制方式,实现器件反向恢复时间的极大减小,并且反向漏电流、软度因子、正向压降等关键参数也较理想,且具有极佳的漏电温度特性,达到器件综合性能的优良折衷,达到国际先进水平。
Conventional hard switching technology has several flaws below : on and off loss , inductive off , capacitive on and diode recover problems . comparing with it , the loss of on and off decreases markedly , as the switches are on and off in zero voltage or zero current cases . and also the size of converter becomes smaller because of the higher of switching frequency 传统硬开关技术由于存在开通关断损耗大、感性关断、容性开通、二极管反向恢复等问题,与之相比,软开关技术在零电压或零电流条件下导通,开关损耗明显降低,加上开关频率的提高使得变换器的体积得以减小,这也是软开关技术受到青睐的原因。
The researching results indicate that using the two kinds of novel structure , the fast - switching and the soft recovery characteristics of the device are much improved but not notable changed in forward drop , and the temperature characteristic is improved , too . most of the characteristics are far better than the normal pin diode structures 研究结果表明，在采用?基区渐变掺杂和台面结构后的p ~ + ( sige ) - n ~ - - n ~ +异质结中，我们得到了更快而软的反向恢复特性，和更低通态压降的正向导通特性，且温度特性也有明显改善。
The researching results indicate the reverse recovery characteristics of the device are much improved : the reverse recovery time is remarkably shorted , the peak reverse current is notably reduced and the soft factor s is also increased in various degrees but not notable changed in forward drop when introducing the two kinds of novel structure 结果表明，采用新结构后，反向恢复特性大大改善，恢复时间明显缩短，软度因子s显著提高，反向峰值电流也有不同程度的降低，其综合性能远远高于si同类型结构及常规p ~ + ( sige ) - n ~ - - n ~ +二极管。
