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一种新型双正激开关电源拓扑研究

摘要：介绍一种适用于中大功率开关电源的新型双端正激式DC/DC变换器电路拓扑，分析其所构成的开关电源主电路及控制、自启动等回路的结构原理，针对其适用于变频器等直流高电压输入和高变压器变比场合所必需解决的励磁磁势维持及续流等特殊问题，提出了一种独特的磁通维持续流控制方法。仿真及实验的结果证实了本方案的正确性与可行性。 叙词：DC/DC变换 拓扑 自启动 PWM Abstract：A novel topology for the double switching forward converter is proposed in this paper, which can effectively prevent the top bridge and the bottom bridge from being short-circuited, moreover, its input voltage can be very high and the capacity of its output DC power source is large, also it can include many output groups. Therefore, this scheme is especially applicable to those electrical system of large power with high DC voltage. In addition, a novel theme to maintain and continue the flux is provided, which can effectively solve the problems existing in most of double switching forward converter when to maintain and continue the flux. Finally, the validity and application of the results of the forgoing research is verified by the analysis of the simulation waves and the results of the experiments. Keyword：DC/DC converter, topology, self-start, PWM

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