二次侧附加电容磁复位正激变换器电气性能分析及参数设计  

Electrical Performance Analysis and Parameter Design of the Secondary-Side Capacitor Magnetic Reset Forward Converter

作　　者：刘树林[1] 庹汉宇 张元昌 Liu Shulin;Tuo Hanyu;Zhang Yuanchang(College of Electrical and Control Engineering,Xi’an University of Science&Technology,Xi’an710054,China)

机构地区：[1]西安科技大学电气与控制工程学院,西安710054

出　　处：《电工技术学报》2024年第19期6008-6017,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51777167,51604217)。

摘　　要：由于二次侧附加电容磁复位正激变换器具有结构简单等优点,因此有着较好的应用前景,但目前尚未见附加电容对电气性能影响及其设计方法的研究报道。为此,该文通过深入分析附加电容C_(b)对变换器工作模式和能量传输过程的影响,指出变换器存在四种组合工作模式,且励磁电感断续导通模式(DCM)/正激电感连续导通模式(CCM)最佳。C_(b)不仅能将励磁能量传输到负载,还可调节开关管电压应力,在负载不太大时实现续流二极管零电流关断(ZCS)和开关管低电压导通。通过分析C_(b)对变换器电气性能的影响,指出开关管电压应力随C_(b)增大而降低,开关管低电压导通性能随C_(b)和正激电感的减小而提升,并提出了一种确保变换器工作于最佳模式且可最大程度提升电气性能的参数设计方法。实例和实验结果验证了理论分析的正确性和设计方法的可行性。Aiming at the problem that the unidirectional magnetization of the single-switch forward conversion topology will lead to the saturation of the transformer,a variety of magnetic reset measures have been proposed.These measures can be broadly categorized as primary side magnetic reset and secondary side magnetic reset.The primary side magnetic reset can only consume the excitation energy on the resistance or feed back to the input side,so that the excitation energy can not be fully utilized,therefore,it is not beneficial to improving the energy transmission efficiency of the converter.The secondary side magnetic reset can transfer the excitation energy to the load during the switch-off period.However,the dual-winding structure on the secondary side increases the volume of the transformer and complicates the winding process.Additionally,the secondary side of the transformer with additional LCD(representing inductor,capacitor,and diode,respectively)different combinations of the structure of the converter,although it has a certain performance advantage,but it also increases the complexity of the circuit,so that its application has been limited to some extent.In contrast,the secondary-side additional-capacitor magnetically reset forward converter has a simple structure,requiring only one capacitor to achieve magnetic reset and transfer excitation energy to the load.Moreover,it facilitates enhancements in multiple electrical performances,effectively improving the performance and efficiency of the converter.This simplicity and performance enhances the application prospects.However,currently,there has been no research report addressing the impact of the additional capacitor on electrical performance and its associated parameter design methods.Therefore,this paper conducts a thorough analysis of the influence of the additional capacitor C_(b) on the energy transfer process and electrical performance of the converter.Additionally,a parameter design method is proposed to fully exploit the electrical performance advantages o

关 键 词：正激变换器 磁复位 低电压导通 零电流关断 

分 类 号：TM46[电气工程—电器]