电力电子技术毕业论文--软开关变流器

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1、 1 摘摘 要要 随着电力电子技术的发展，其各种变流装置趋于小型化、轻量化，对电路开 关的频率提出了更高的要求。在一些小功率场合，半桥结构由于其结构简单而受 到广泛应用。 由于半桥桥臂两开关管工作于高频开关状态， 其开关损耗不容忽视， 而采用软开关技术则可以降低或消除开关损耗，提高效率和功率密度。而实现软 开关可通过加谐振电路或通过控制脉冲控制都可实现软开关。 软开关半桥控制策 略又有 4 种。本文通过对 4 种控制策略进行分析和比较，根据不同的控制策略确 定各策略的应用场合及在各种场合下的不同技术参数。 关键词： 半桥 变流器 软开关 控制策略 ABSTRACT Along with the

2、 electric power electronic technology development, itseach kind of variable current installment tends to theminiaturization, liten, set a higher request to the terminal switchfrequency. In some low power situations, half bridge structure simplereceives the widespread application as a result of its s

3、tructure.Because half bridge 桥臂 two switching valves work to the highfrequency switch condition, its switch loses not allow to neglect, butuses the soft switch technology to be allowed to reduce or toeliminate the switch to lose, enhances the efficiency and the powerdensity. Sends along with the ele

4、ctric power electronic technology realizes thesoft switch passable to add the acceptor or all may realize the softswitch through the control pulse control. The soft switch half bridgecontrol strategy also has 4 kinds. This article through carries on theanalysis and the comparison to 4 kind of controls strategies,determines various strategies according to the different controlstrategy the application situation and under each kind of situationdifferent technical parameter. Key word: