一种应用同步整流技术的双管正激变换器的研究  

Research on a Dual-switch Forward Converter Using Synchronous Rectification Technology

作　　者：程铭 CHENG Ming(No.43 Research Institute of CETC,Hefei 230088,China)

机构地区：[1]中国电子科技集团公司第四十三研究所,合肥230088

出　　处：《混合微电子技术》2020年第4期1-4,共4页Hybrid Microelectronics Technology

摘　　要：传统的单管正激变换器需要磁复位电路来防止高频变压器磁饱和,开关管承受输入2倍或更大的电源电压,使其应用受到限制,而双管正激变换器具有开关管电压应力低、无桥臂直通危险、可靠性和效率高及无需外加磁芯复位电路等优点,因而广泛应用在中大功率电路中。本文在一般双管正激电路基础上进行了相应改进,采用自绕组驱动方案,使双管正激电路的上管实现自驱动,同时为提高电源效率,次级采甩栅极电荷自驱动同步整流方式。通过Saber仿真验证了前面所述双管正激变换器的合理性与优越性。The traditional single-switch forward converter requires a magnetic reset circuit to prevent magnetic saturation of the high frequency transfbnner,and the switching transistor withstands twice or more input power supply voltage,which limits its application,while the dual-switch fonvard converter has the advantages of low switching transistor voltage stress,no bridge arms,high reliability and high efficiency,and no additional magnetic core reset circuit,so it is widely used in medium and high power converter.In this paper,based on the general dual-switch forward circuit,the self-winding drive scheme is adopted to realize the self-driven of the upper transistor of the dual-switch forward circuit and improve the power supply efficiency at the same time.The secondary uses the gate charge self-driving synchronous rectification.The rationality and superiority of aforementioned double-switch fonvard converter are verified by Saber simulation.

关 键 词：双管正激 同步整流 反馈环路 开关电源 

分 类 号：TM461[电气工程—电器]