Study Of A Digital Inverter Power Supply With High Frequency Link

Above all,the paper introduces general situation of the research of high frequency link inverter.High density of power and high efficiency is the goal that present-day power electronics converter is pursing.And that high frequency link technology,which is the keystone of the papr, has huge advantage of high density of power and high frequency.The precept that the paper adopts is low DC voltage to high DC voltage, then to AC. The precept is simple and can be realized easily, although which has three power conver taches.Also, the precept can better combine the high frequency lind technology with SPWM inverter technology, which produce 50Hz sine wave with little harmonics.In the whole design,the former DC/DC converter chooses the push-pull topology that is the first choice in the low voltage and big current situation.The DC/DC converter adopts open-loop control.The latter inverter is a stand-alone system and must adopt closed-loop control for better dynamic and static characteristics.So,the paper chooses voltage feedback dual closed-loop control.The drive signals of the two push-pull switches in the former DC/DC converter and of the four switches in the latter inverter are produced by Digital Signal Processing.At the same time , Digital Signal Processing control the whole system and momently examine the system operation state.So,the whole system control is absolutely digital.