Design And Research Of The Acid-lead Battery Charging Circuit Based On SiC Device

With the increasing maturity of the Uninterupted-power supply and widely using in industries,we are looking forward to a higher level performance of the equipment.As a important part of the UPS,the charging circuit should be paid more attention to.In this paper we start from the selecting of the main circuit topology,then discussing about the parameter design.This paper also focus on the application of SiC device.With the commercialization of the SiC device,the whole industry will be greatly revolutionlized.The benefit it brings including increasing the frequency and lowering the cost of power.To confront this challenge,this paper has many differences in contrasting to the former thesis.One of these is the application of the SiC device.We should know that the driving circuit of the SiC device requires a different driving voltage level.in this paper we give a new driving circuit for the SiC device,and the test proves it has satisfactorily reliability.In this paper we also discuss about the lead-acid bettery,trying to build the model of it.The battery is also a vital part of the entire machine.Futher more the modeling of the battery lays a solid foundation for the prediction of the SOC in the future.Here the battery modeling is carried out in the form of PNGV criterion with the estimation tool in the matlab.In accordance to results the accuracy proves to be just suitable.The resonance of the circuit under DCM mode is well studied.Through the distribution parameter discussion,we are able to use the theory to build a more accurate model of the circuit including the SiC node capacity.In reference to the experiment,the simulation fits the results well.So we can find out the forming mechanism of this resonance.