Improved Configuration for Dc to Dc Buck and Boost Converters

Using of renewable energy in the upcoming future seems unavoidable ,so output of this sources should be utilized via following the maximum point of the power in sporadic products of production system. output of these sources should be compatible with consumer and grid condition (Erickson,1997).So, output energy should be in favorable form ,by using suitable interface circuits. Energy management of these sources will possible if there is comprehensive control(Camara and et al,2010). In several power conversion applications ,it is required to convert a constant dc voltage source to a variable output dc voltage.This is performed by dc-dc converters.These converters are used in several applications such as renewable energy systems,distributed generation systems,and power factor correnction process.In past decade ,several studies have been done about reducing the output voltage ripple of dc-dc converters. A good design requires special attentions to many circuit parameters such as ripple voltage, power losses,and etc.In this path these parameters usually act in such a way that improving one parameter might have a big effect on another parameter.In Buck and Boost converters with one switch, voltage ripple reduction is accomplished by selecting a bigger capacitor at the output but in low transient time,but cost will increase.In order to decrease power losses in the Power switches,one can decrease the switching frequency but this process will increase ripple voltage and will have an adverse effect on the output voltage waveform. Changing structure of the converter using new topology can improve the operation of the converter.In this configuration utilizing two storage devices will have lowest damaging effects on circuit parameters.This novel converter has two inductors and two switches which can improve several factors over conventional converter by considering a delay time between these two switches.These factors are namely;output voltage ripple,transient time,and maximum of transferable power(Jahanmahin et al,2012).Buck dc to dc converter is used to change the input voltage level to a desired output voltage level less than the input voltage magnitude and Boost dc to dc converter is used to change the input voltage level to a desired output voltage level more than the input voltage magnitude.This paper proposed a novel method for increasing output power by utilizing two storage elements(inductor and capacitor) for Buck and Boost converter.By analysising and simulating with Matlab software, the results are provided.Then it is compared with conventional buck and boost converter.In this improved converters,two inductors used for feeding the load by two switches of insulated gate bipolar transistor(IGBT) type. One inductor is charged by the source voltage while another inductor was discharging its energy into the load during the same time.With this novel structure ,output power generation was almost double and the output voltage reduced to half.

Keywords:

Boost dc-dc converter , Ripple voltage , Buck dc-dc converter