交错并联磁集成反激变换器小信号建模分析

摘要

In the application of high current converter, interleaving technique is widely adopted to decrease the output ripple, improve the heat dissipation and enhance transient performance. This paper introduces the two-phase interleaved flyback DC/DC converter with magnetic integration, derivating the equivalent circuit of the converter by building the dual relationship between magnetic circuit and electric circuit, analysing the equivalent circuit with small signal model, and gaining the transfer functions of the converter. Then the prototype with 48V input and 12V/10A output was built for experimental verification.%在大电流的功率变换器中,普遍采用交错并联技术以降低输出纹波,改善散热条件和提高动态性能.论文以具有磁耦合集成结构的两路交错并联反激变换器为对象,通过磁路-电路对偶等效变换推导出变换器的等效电路,进一步采用状态空间平均法对变换器进行小信号建模分析,求出变换器的各项传递函数,并获得变换器闭环传递函数.分析了耦合程度的不同对传递函数的影响.在此基础上对具有集成磁件的反激变换器进行仿真,最后通过48V输入、12V/10A输出的样机进行了实验验证.