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Switched Inductor And Capacitor Combined Boost Topological Structure Interleaved Parallel DC/DC Converters

Posted on:2019-03-16Degree:MasterType:Thesis
Country:ChinaCandidate:C WangFull Text:PDF
GTID:2382330572452514Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
In a series of new-type power generation systems such as photovoltaic power generation systems and chemical batteries,UPSs,new energy vehicles,and other fields,a DC/DC converter with a high voltage gain characteristic with low voltage input and high voltage output is often used.The traditional boost chopper converter under the influence of series equivalent resistance and parasitic parameters,after a certain duty cycle,will greatly reduce the efficiency.In applications such as uninterruptible power supply and new energy power generation,high-gain DC/DC converters have been widely used.Based on the traditional interleaved boost converter,a switched-capacitor combined Boost topology staggered parallel DC/DC converter was proposed.The proposed converter features low input current ripple,automatic current sharing of the two-phase inductor current,low voltage stress of the switch and diode,and high step-up voltage capability,and is suitable for applications where the input/output voltage ratio is large and electrical isolation is not required.In order to increase the amplifying ability of the amplifier circuit of the conventional buck-boost converter for the input signal while reducing the higher harmonic components and the converter volume in the current,this paper adds magnetic integration to the conventional boost converter.Switching inductance and staggered parallel technology.The ability of the traditional inductor to be replaced by the switching inductor will increase the ability to amplify the signal multiple by 4(1+D)/(1-D)times;the use of magnetic integration technology and rational design of the coupling coefficient between the coupled inductors can reduce the inductance of the converter The current ripple of the circuit increases the transient response speed of the system and reduces the volume and weight of the converter,thereby improving the electrical performance of the converter.By analyzing the equivalent steady-state inductance and transient inductance of the branch,the steady-state current ripple and transient response speed of the branch and the positive coupling degree between the coupled inductor,the degree of reverse coupling,and the occupation of the main switch are obtained.Empty is related to D.Using the method of normalizing equivalent inductance,the design criteria of the converter's inductive coupling degree are given,and the effective design range of the parameters is introduced.By controlling the on-duty ratio of the main switch,the converter can achieve the effect of step-up and step-down voltage during the stable operation and expand the range of the output voltage of the converter.Considering the actual demand,small-signal modeling analysis of the converter was performed,the control model of the converter was given,and the stability of the system was improved.Finally,verifying and designing an experimental prototype through PISM simulation verify the correctness of the theoretical analysis.It shows that the combination of switching inductance and capacitance Boost topology staggered parallel DC/DC converter has excellent work performance and is suitable for working in high power applications.
Keywords/Search Tags:DC/DC converters, Switching inductance, Magnetic integration technology, Staggered parallel, PV
PDF Full Text Request
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