Research on continuous restrictive pulse train controlled switching converter
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摘要: 针对脉冲序列控制开关变换器运行在电感电流连续导电模式下存在较大的低频振荡现象，进而影响开关变换器工作性能的问题，提出了一种连续限制性脉冲序列控制方法。以连续限制性脉冲序列控制Buck变换器为例，详细介绍了该控制方法的工作原理，阐述了其抑制开关变换器低频振荡的机理，建立了连续限制性脉冲序列控制Buck变换器在电感电流连续导电模式下的开关映射模型。通过Matlab仿真和样机实验，对比了脉冲序列控制和连续限制性脉冲序列控制下Buck变换器的输出电压和电感电流情况。研究结果表明，与脉冲序列控制方法相比，连续限制性脉冲序列控制方法通过对连续脉冲个数进行限制，有效抑制了开关变换器在电感电流连续导电模式下的低频振荡现象。Abstract: For larger low-frequency oscillation of pulse train(PT) controlled switching converter under inductor current continuous conduction mode (CCM) which could degrade operation performance of switching converter, a continuous restrictive pulse train (CR-PT) control method was proposed. Operation principle of CR-PT control method and its mechanism of suppressing low frequency oscillation of switching converter were introduced in detail by taking CR-PT controlled Buck converter as an example. Switching mapping model of the CR-PT controlled Buck converter under CCM was established. Output voltage and inductor current of Buck converter were compared under PT control and CR-PT control separately through Matlab simulation and prototype experiment. Research results show that compared with PT control method, CR-PT control method can effectively suppress low-frequency oscillation of switching converter under inductor current CCM through restricting the number of continuous pulses.
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