However , these converters become more complicate . phase - shift bi - directional dc - dc converter is attractive since it operates with fixed frequency , has small voltage and current stress and can realize zvs without auxiliary switches 相移控制双向dc - dc功率变换器因具有功率器件电压,电流应力小,定频工作和无须增加辅助器件即可实现功率器件的零电压开关条件等优点而受到关注。
The second , the realization of the zvs has no concerned with the attribute of load . with the load of light or full , even the resistance or inductor load , the chopper can ensure that the main - switches will realize the zvs switching 其次,实现零电压软开关的条件与负载的性质和程度没有关系,无论是电阻性负载还是大电感负载,无论是轻载还是满载,都可以实现功率器件的零电压开通和关断。
Power fast recovery diode , which is abbreviated to frd , is one of the key devices in modern power electronic technology . in the power electronic circuits , frd is usually parallel connected with three - end power devices as their freewheeling diode 高压功率快恢复二极管(以下简称frd )广泛地应用于电力电子电路中,作为续流二极管与三端功率器件并联使用,是现代电力电子技术中的关键器件。
In the dissertation , the rf characteristics of the periodically iris - loaded elliptical waveguide used in slow - wave structure is discussed . the structure has potential applications to high - power microwave devices and filtering networks at millimeter wave frequencies 在本论文里,我们讨论了周期膜片加载椭圆波导作为慢波结构的射频特性,这种结构有可能应用于高功率器件和毫米波段的滤波网络。
With replacement of traditional extruded aluminum sinks by hp natural cooling mode , or of conventional water cooling by hp forced cooling pattern , equipments are greatly enhanced with more reliable safety and less possibility of breakdown 它以自然散热方式替代传统的铝型材散热和风冷散热或以风冷散热方式代替传统的水冷散热方式，极大地提高了功率器件的使用寿命，保障设备的运行安全性，减少了设备的故障率。
Secondly , in order to research the mode contention which probably exists in the improved big dimension rbwo , the author research the conditions which the mode contentions exist in the rbwo and provide the preliminary ways to prevent the occurrence of mode contentions 其次，为了研究这种改善后高功率器件中可能存在的模式竞争问题，作者对rbwo模式选择问题作了初步的探讨，并就如何避免rbwo中的模式竞争的基本条件作了相应的论述。
Since the parameter of full - solid electronic equipment such as volume , weight , property , price and reliability etc . mostly depends on high - frequency and microwave bipolar power transistors and their amplifiers , so it has great value and practical significance to devices their property 大功率全固态电子设备的体积、重量、性能、价格和可靠性很大程度上都取决于双极功率器件及其放大器的性能，因此提高该类器件的性能具有很大的应用价值和现实意义。
This paper researches the digital characteristics of the welding power supply and the main circuit of the full bridge high power soft - switching . nowadays , welding machines usually apply the hard - switching as the topology , which causes the problem of higher loss and lower efficiency 目前焊接逆变电源所应用的大功率电路多采用硬开关电路,这样在功率器件导通和关断过程中会产生很大的损耗,并且随着逆变频率的提高,损耗会增大,这样就降低了焊机的效率。
Based on the theoretic analysis , the control circuit which uses the tms320lf2407 dsp evm board as core and the main circuit which uses the ipm as the power parts of an apparatus is studied , and the arithmetic of asynchronous electromotor direct torque control based on tms320lf2407 are made in the environment of cc ' c2000 在理论分析的基础上，研究了以tms320lf2407dspevm板为核心的控制电路和以ipm为功率器件的主回路，并在cc ' c2000环境下实现了基于tms320lf2407dsp的异步电动机直接转矩控制算法。
Because direct torque control requires very high performance of real - time , the popular microcomputer core dsp is used as controller in the design of hardware . its high speed of running is suitable for the experiment . in the main circuit , there is a highly integrated power element : ipm as inverter , which includes seven igbt , has high switch frequency and fault diagnosis function 在本控制系统的具体实现上，由于直接转矩控制对实时性要求很高，因此在硬件方面，采用了目前比较流行的数字信号处理器( dsp )作为系统的控制器，其处理速度高的特点正好符合本实验的需要：在主电路中，本系统使用了集成度高的功率器件：智能功率模块( ipm ) ，作为逆变环节，其集成了七个igbt ，实现了高开关频率逆变以及故障诊断的功能，从而使控制系统的体积大大缩小、控制更加灵活。
