一种基于自由衰减振荡的固定占空比控制的无铁芯变压器  

Coreless Transformer under Constant Duty Control Based on Free Decay Oscillation

作　　者：戴晨皓 张波[1] DAI Chenhao;ZHANG Bo(School of Electric Power Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学电力学院,广州510640

出　　处：《电源学报》2024年第2期1-9,共9页Journal of Power Supply

基　　金：国家自然科学基金重点资助项目(52130705)。

摘　　要：针对基于无铁芯变压器的DC-DC变换器工作频率过高的问题,提出了一种基于自由衰减振荡的无铁芯变压器的DC-DC变换器。首先,建立无激励源的串联型-串联型拓扑电路理论模型,讨论特征根的演化过程,分析系统自由衰减振荡的运动行为。其次,设计基于自由衰减振荡无铁芯变压器的DC-DC变换器。实验结果表明,该变换器的开关频率可明显低于无铁芯变压器的工作频率,且其输出功率与无铁芯变压器的工作频率可被自由衰减振荡系统的特征根所描述。最后,构建一个实验样机,该样机采用固定占空比控制,当无铁芯变压器的工作频率为206 kHz、开关频率为103 kHz和69 kHz时,变换器的最高整机效率为91.2%,变压器效率在任何工况下均高于96%。Aimed at the problem that DC-DC converters with coreless transformers must operate at high frequen-cies,a DC-DC converter with a coreless transformer based on free decay oscillation is proposed.First,a circuit model in series-series topology with no excitation sources is established,the evolution of the eigenvalue is discussed,and the free decay oscillation behavior of the system is analyzed.Second,the DC-DC converter with a coreless transformer based on free decay oscillation is designed.The switching frequency of this converter can be significantly lower than the operating frequency of the coreless transformer,and the output power from the converter and the operating frequency of the core-less transformer can be described by the eigenvalue of the free decay oscillation system.Finally,an experimental proto-type was constructed,which was under constant duty control.The switching frequency of the converter was reduced to one half(103 kHz)and one third(69 kHz)of the operating frequency of the coreless transformer(206 kHz),respective-ly.The converter efficiency achieved 91.2%,and the transformer efficiency was always higher than 96%.

关 键 词：无铁芯变压器 自由衰减振荡 电路理论 DC-DC变换器 固定占空比控制 

分 类 号：TM46[电气工程—电器]