Research On Interleaved Integrated Magnetics High Gain Boost Converter With DCM Unit

With the increase of human activities,the consumption of energy is increasing day by day.Therefore,the energy crisis and environmental pollution problems are becoming more and more serious.The emergence of new energy sources has improved this situation.For the sake of sustainable development,the study of new energy sources is an important topic in the scientific community.Including fuel cell,photovoltaic cells,batteries because of its clean,environmental protection,safety and high efficiency has been widely used,the microgrid / grid connected power system composed of these new batteries,require higher input voltage.To improve the input voltage of new batteries,the study of high gain Boost converters is becoming more and more important.In theory,the conventional Boost converter can achieve the desired output voltage by changing the duty cycle D.In practice,the larger the duty ratio,the more problems the converter can not meet the needs of the work.In order to improve the voltage gain of the converter,reduce the inductance current ripple and reduce the voltage stress of the switching device,an interleaved parallel magnetic integrated high gain Boost converter with DCM unit is proposed.The converter will traditional boost converter using interleaving technique to reduce the input current,switch inductance unit instead of inductor,inductance on the inductance of the switch unit are coupled to integrated magnetic components to reduce the volume of not only saves space but also reduces the inductor current ripple.Choosing proper coupling degree,inductance current ripple is halved,adding DCM unit,that is capacitor C1 and C2,acts as voltage source,feeding power to the load,increasing voltage gain,and reducing voltage stress of switch device.This paper analyzes the converter working mode and working performance,the theory on voltage gain is the traditional Boost converter(1+D)2 times,the inductor current ripple is reduced by half,the voltage stress of switches is the output voltage of 1/2.In order to consider the actual demand,the small signal modeling and analysis of the converter is given.The control model of the converter is given to improve the stability of the system.Finally,a prototype of 600 W is verified and designed by PISM simulation,and the correctness of the theoretical analysis is verified.The results show that the interleaved parallel magnetics high gain Boost converter with DCM unit has excellent performance and is suitable for working in high voltage field.