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中文摘要：
随着DC-DC变换器的实际应用领域的不断扩大，人们对变换器系统的稳定性提出了更高的要求，因此，精确而有效的建模和仿真对于变换器的发展有着重大的意义。本文以电力电子Buck电路为例，提出混合键合图模型和键合图平均模型两种模型，这两种模型都是在键合图建模理论的基础上，根据电路中开关控制方式的不同而得到的。首先经过分析得到Buck电路的两种键合图模型，并在GME（Generic Modeling Environment）软件中搭建模型，然后通过该软件将它转换为Matlab框图模型并仿真，最后将仿真结果与实际电路模型的输出波形进行对比分析，验证了两种模型的可行性和正确性。
英文摘要：
Along with the enlargement of the actual application of DC-DC converter,people put forward the higher requirement to the stability of converter system.Thus,accurate and effective modeling and simulation are of great significance to the development of converter.Taking Buck circuit as an example,this paper presents two new kinds of models called hybrid bond graph model and average bond graph model.The two models are all derived from basic theory of the bond graph modeling,but they differ in the control mode of circuit switch.First,through the analysis,the two kinds of bond graph models are achieved,and are built in the GME（Generic Modeling Environment） software.Then,they are automatically converted to Matlab diagram model through the software and simulation in Matlab.At last,by comparing and analyzing the simulation results with the actual output waveform,the correctness and feasibility of the two models are verified.
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