一種新型雙正激開關電源拓撲研究

摘要：介紹一種適用于中大功率開關電源的新型雙端正激式DC/DC變換器電路拓撲，分析其所構成的開關電源主電路及控制、自啟動等回路的結構原理，針對其適用于變頻器等直流高電壓輸入和高變壓器變比場合所必需解決的勵磁磁勢維持及續流等特殊問題，提出了一種獨特的磁通維持續流控制方法。仿真及實驗的結果證實了本方案的正確性與可行性。 敘詞：DC/DC變換 拓撲 自啟動 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