摘要
针对隔离式DC/DC变换器空间辐射应用的特殊性,为了提高反馈精度和稳定性,一般采用磁隔离反馈电路.介绍了几种常用的幅值调节磁反馈电路工作原理,针对其存在的需要额外的次级供电电压问题,引入正-反激式幅值调节双向磁反馈电路,并对该电路进行改进,在实现相同功能的前提下,以双绕组变压器替代三绕组变压器,有效减小了磁芯体积,简化了电路结构.详细分析了该电路的工作原理、脉冲采样电路和磁反馈变压器设计方法,并以该种磁反馈电路为基础,搭建了一台100 W输出DC/DC变换器实验样机,仿真和实验结果证明了该磁隔离反馈电路的有效性,并为工程设计提供了理论指导.
Abstract
Aimed at the particularity of an isolated DC/DC converter when it is applied in a space radiation environment,the isolated magnetic feedback circuit is usually used to improve the feedback accuracy and stability.The working principles for several commonly used amplitude modulation magnetic feedback circuits are introduced,and a forward-flyback amplitude modulation bidirectional magnetic feedback circuit is introduced and optimized to solve the problem of the need for an additional secondary power supply voltage.Under the premise of realizing the same function,a two-winding transformer is used to replace the three-winding transformer,which effectively reduces the volume of the magnetic core and simplifies the circuit structure.The working principle for the circuit and the design method for a pulse sampling circuit and a magnetic feedback transformer are analyzed in detail.In addition,based on the magnetic feedback circuit,a DC/DC converter prototype with 100 W output was built.Simulation and experimental results show the effectiveness of the proposed isolated magnetic feedback circuit,providing a theoretical guidance for engineering design.
维普
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