Multi-pulse train control technique for buck converter in discontinuous conduction mode

Multi-pulse train (MPT) control technique, a novel control technique for the control of switching DC-DC converters is proposed here. Unlike traditional pulse train (PT) control technique, which realises the output voltage regulation of switching DC-DC converters by a combination of two different control pulses, MPT control technique extends these two different pulses to multi-level pulses, and thus overcomes the drawback of relatively large output voltage ripple of PT control switching DC-DC converters. Buck converter operating in discontinuous conduction mode is taken as an example to illustrate the operation principle of MPT control technique. Comprehensive analysis on the control pulse combination within a MPT repetition cycle is performed and verified by simulation and experimental results. It also shows that MPT control buck converter has much lower output voltage ripple than PT control technique, and much better transient performance than traditional pulse-width modulation buck converter.