交错控制双输入Boost变换器的能量传输模式及输出纹波电压分析

Analysis of Energy Transmission Mode and Output Ripple Voltage of Interleaved Dual-Input Boost Converter

多输入Boost变换器较传统并联方式工作的Boost变换器而言,具有体积小、成本低、增益高、控制方式灵活等优点,因此在新能源联合分布式发电系统中具有广阔的应用前景。但由于多输入Boost变换器存在多个输入电压及功率开关管,导致其供能模式及输出纹波电压较传统Boost变换器要复杂得多。为给多输入Boost变换器的分析和设计提供正确的理论指导,该文对采用交错控制的双输入Boost变换器供能模式及输出纹波电压进行深入研究。研究结果发现,电感L1存在完全电感供能模式(CISM)、不完全电感供能模式(IISM)和断续导电模式(DCM)三种供能模式;电感L2存在连续导电模式(CCM)和DCM两种供能模式。推导出各供能模式的临界电感,得到各供能模式的输出纹波电压解析式,据此给出双输入Boost变换器参数设计方法。实验结果验证了该理论分析的正确性。

Multi-input Boost converters have the advantages of small size,low cost,high gain,and flexible control methods compared with Boost converters operating in a traditional parallel mode.Therefore,they have broad application prospects in new energy joint distributed power generation systems.However,due to the existence of multi-input voltage and power switches,the power supply mode and output ripple voltage of the multi-input Boost converter are more complicated than those of traditional Boost converters.In order to provide correct theoretical guidance for the analysis and design of the multi-input Boost converter,this paper studies the power supply mode and output ripple voltage of dual-input Boost converter with interleaved control.It is found that there are three energy supply modes for inductor L1:complete inductor energy supply mode(CISM),incomplete inductor energy supply mode(IISM)and discontinuous conduction mode(DCM),and two energy supply modes for inductor L2:continuous conduction mode(CCM)and DCM.The critical inductance of each energy supply mode is derived,and the analytical expression of output ripple voltage of each energy supply mode is obtained.Accordingly,the parameter design method of dual-input Boost converter is given.The experimental results verify the correctness of the theoretical analysis.