航天器用DC／DC变换器的建模仿真与研究

分析了已应用在航天器上采用单端反激拓扑的DC/DC变换器基本工作原理,在此基础上,根据小信号平均建模的基本方法,对该DC/DC变换器进行小信号建模分析,得到了电压控制模式和电流控制模式下的传递函数.基于这种平均理论,通过Saber建立的模型,从电压、峰值电流、平均电流控制模式方面进行了阐述.并根据峰值电流控制模式方式建立了具体的仿真电路,进行了直流分析、瞬态分析以及交流小信号分析.实际电路的测试结果验证了建摸仿真的正确性,并给出了仿真及实际的波形.

Modeling Simulation and Study of DC/DC Converter for Space Applications

The basic operation principle of the DC/DC converter with flyback topology was analyzed, which was applied in the spacecrafts. Based on the small-signal ac average model theory, the small-signal model of the DC/DC converter was built and analyzed. And then the output characteristic transfer functions of voltage control mode and current control mode were proposed. Based on this average theory, the voltage control mode, peak current control mode and the average current control mode were studied respectively through the model built in the Saber software. DC analysis, transient analysis and AC small-signal analysis were proposed. Works of this kind were studied from the simulation circuit built on the peak current control mode. The results of the modeling simulation are confirmed experimentally, and the waveforms are also given.