The applications of bionics in power electronics were firstly proposed as a new research subject . some inspiration or new ideas on the technology of power electronics can be drew from nature 学习和借鉴大自然中各种生物结构和功能机理，在电力电子学研究过程中可以产生一些新的研究思路。
Besed on the circuit , electromagnetism and electric power electronics theories , we have done some theory research on the harmonics induced by thyristor commutate circuits of ac - dc locomotive , surge electromagnetism process . we calculate the theory content of harmonics using the fourier arithmetic under thyristor commutate and surge electrmagnetism process 论文根据电力机车类型的不同，运用电路、电磁场和电力电子学理论研究了交?直型电力机车相控整流时谐波的产生机理、励磁涌流的电磁过程，并对晶闸管相控整流和励磁涌流时的理论谐波含量进行了傅里叶分析。
A great deal of research work has been done in this domain in foreign , and there have been plentiful productions . as well , there is much research work in progress in some domestic research institutions , in this domain , especially due to requests of national defense construction . it is for requests of national defense construction that an research institution establishes a special item to research high - voltage high - power converter in a domestic research institution , considering especial requests that the space - flight and aviation systems make for high - voltage dc - dc powers 高效、高功率密度、高压大功率直流变换技术属于电力电子学范畴，国外已在此领域开展了大量的研究工作，并取得许多成果。国内也有一些单位从事该领域研究，特别是针对国防建设的需要。本项目正是某研究单位国防建设的需要，考虑到在航空航天领域对高压直流电源的特殊要求，设立了专门研究项目，展开对高压大功率直流变换技术的研究。
Shindengen is working to respond to these challenges with the development of next - generation products with new functions , new capabilities and more customer value resulting from technologies accumulated during 50 - plus years of concentrated innovation . as a leading power electronics company , we believe that it is also our mission to conserve energy resources by pursuing the highest conversion efficiency of all our products and by contributing to the global society by tackling global environmental protection on a broad scale 面对这种形势，我们认为自己的使命就是，运用历经半个多世纪积累起来的独创技术，创造具有新功能、性能、附加价值的下一代主力产品，同时作为电力电子学领域的主导企业，通过最大限度地追求产品的转换效率，广泛地致力于节省能源资源、保护地球环境，从而为社会做贡献。
A novel phase - shifted zero - voltage and zero - current switching pwm dc / dc full - bridge converter is presented in this thesis , which is based on the groundwork of summarization of the development of power electronics in recent years and lucubration in theoretical basis of modern high frequency soft switching power convert technique and analysis of operation principle , characteristic of the circuit and inherent drawbacks of the traditional phase - shifted zero - voltage switching pwm dc / dc full - bridge converter 本文在对近年来电力电子学科的发展高度综述和对现代高频软开关功率变换技术理论基础深入研究的基础上，对传统的移相控制zvspwmdc dc全桥变换器的工作原理、电路特性、存在的缺点进行了分析，在此基础上提出了一种改进型的移相控制zvzcspwmdc dc全桥变换器。
