High frequency soft - switching conversion is an important subject of power electronics . it is a powerful approach of minimization of size and weight for power supplies 高频软开关技术是电力电子学的一个重要的研究方向，是实现功率变换装置小型化，模块化的基础。
Dc / dc full - bridge converters is widely used under the situation which needs middle and high power supplies , so the investigation into its soft - switching technologies is very significant Dc dc全桥变换器广泛应用于中大功率场合，因此研究其软开关技术具有十分重要的意义。
Siemens medium voltage switching technologies ( wuxi ) ltd . is a joint venture established in nov . 1997 by siemens ag , germany and wuxi electronics and instruments industry corp 西门子中压开关技术（无锡）有限公司是由德国西门子股份公司与无锡市电子仪表工业公司于一九九七年共同投资设立的中外合资企业。
In order to reduce the size and weight of the transformer , as the development of high frequency switching technology , it is possible that the high frequency transformer replaces the low frequency transformer 为了克服低频变压器笨重、体积大等缺点，随着高频开关技术的不断成熟，去掉低频变压器成为可能。
For that purpose , the paper discusses the origin and categories of soft switching , introduces its developing process and typical circuit , pointing out their advantages and disadvantages 并由此阐述了软开关技术的起因与分类，详细地叙述了软开关技术的发展历程和在各个阶段的典型代表电路拓扑结构，指出了它们的优缺点。
As one of the fastest growing business units among siemens ptd ' s operations in china , smvs is playing an active role in facilitating the sustainable development of china ' s electric power industry 作为西门子输配电在中国发展最快的业务部门之一，西门子中压开关技术(无锡)有限公司为推动中国电力行业的可持续发展扮演了重要的角色。
The soft - switching techniques of the buck fb converter have been studied extensively and used widely in the past two decades , however , less attention has been paid to the soft - switching techniques of the boost fb converter 在过去的几十年中, buck型全桥变换器的软开关技术得到了系统而深入的研究,并得到了广泛应用。关于boost型全桥变换器的软开关技术研究相对较少。
For the limitations of traditional pwm hard switching circuit , a kind of zero of pair soft switching technology is introduced and the switching loss can be cut down by it and the reliability of inverter in case of high frequency can be improved also 由于传统pwm硬开关电路的局限性，本文采用一种双零谐振型软开关技术降低开关损耗以及在高频情况下提高整机的可靠性。
Higher frequency , modular construction and digitalization is the main development tendency in the field of the switching power supply . high power density and high frequency converter is based on soft - switching techniques 实现高频化的主要途径是软开关技术，全桥移相零电压脉宽调制变换器是软开关pwm技术在全桥直-直变换器中较成功的应用例子，并具有较好的工程实现价值。
In order to make the switching power supply operate with high efficiency and high frequency , since 1970s , soft switching technology is continually researched and developed by domestic and abroad power electronic fields and power supply technology fields 为了使开关电源在高频下高效率地运行，国内外电力电子界和电源技术界自70年代以来，不断研究开发高频软开关技术。
