Research on continuous restrictive pulse train controlled switching converter

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.

Keywords

• switching converter
• buck converter
• pulse train control
• continuous restrictive pulse train control
• continuous conduction mode
• low-frequency oscillation
• switching mapping