Modelling of High Gain DC-DC Converter

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Modelling of High Gain DC-DC Converter

Dilip Kumar Arya

    1. ech, (Dept. of Electrical Engineering) Integral University

      Lucknow India

      M.A. Malick

      Professor, (Dept. of Electrical Engineering) Integral University

      Lucknow India

      Abstract This er discusses about modelling f high-gin D t D nverter with the redutin in vltge stress, whih is used in le f regulr ste u nverters. Regulr ste u nverter desnt stnd t high gin due t hevy vltge stress. Here we n use the slr energy, wind energy s sure fr the ste u nverter. rsed nverter wrks t very high vltge gin mred t the existing tlgies suh s the twie bst nverter nd nventinl bst nverter. The min dvntge f the proposed bst nverter ver the nventinl bst nverter is tht it rvides very high vltge gin t lwer duty rti nd hs better effiieny t higher lds s mred t nther similr kind f nverters. The nverter design nd mrisn with revius bst nverter hve been disussed in detil with surting simultins using MTLB/SIMULINK.

      Keywrds: High vltge gin, D-D nverter, duty rti


        In nient ges, ele used t deend un the Sun nly, the mst werful energy sulier n the Erth. Then they used t lern but the use f fire nd sitive vibe me t their mind twrds the inventin f sme deendble sure f energy. Eletriity, being disvered by Benjmin Frnklin in the 18th entury hs ened the eyes f the then Sientists nd Reserhers fr the best future sure f energy [1]. The inresing deendeny n eletriity requires mre munt f eletriity genertin by mbustin f fssil fuels by

        link nd hene the system st is redued [14-17]. rsed nverter wrks with lw vltge stress, high vltge gin, nd ls rvide higher effiieny trile bsting in inut vltge.


        One f mst imrtnt litins f the high gain D- D nverter is renewble energy genertin. The gin f multilevel nverter is deends un the duty yle f gte ulse. When nvetinl nverter ertin is designed int given bst nverter ertin, nly hnges the utut vltge nd vltge gin. The block diagram of the high gain DC-DC Converter is shown in Figure 1. The high gain Boost DC-DC Converter contains only one button (MOSFET), so it has only two operating modes. During start-up mode, the button is turned on and diode D5 is not working. During the second operating mode, the button is in OFF mode and the D5 diode is ON mode. Diode D5 acts as freewheeling condition.

        1. Case-1 (When Switch ON)

          During the switch S is in ON condition and diode D1 to D4 are conducting, and D5 works in reversed biased. The switch S is conducting for an interval of DT, where D is the duty ratio and T is the time period of the switching signal. The voltage across the inductors during this mode of operation can be obtained by applying KVL as shown in circuit and the equations are as follows:

          1 = 2 (1)

          utting gret imt n the green huse effet nd glbl wrming. Mdern tehnlgy mkes the use f




          renewble energy sures (RES) t beme n lterntive f the mbustin engines fr wer genertin s the st nd the envirnmentl issues re nerned withut ny hrmful emissin [2-3]. Few f these sures inlude slr, fuel ell, wind energy et [4-5]. These renewble sures needs wer nditining using wer eletrni nverter [6-8]. htvlti (V) bsed system is mst ulr mng vrius sures f renewble [8-11].But the utut f V ells re very lw s need islted/ nn islted D-D nverter, whih ste u the lw inut D vltge int higher utut vltge. Trnsfrmer bsed islted tlgies suffer frm limited swithing frequeny, inresed trnsfrmer lsses, inresed vltge stress rss the devie nd re bulky[11-14]. S the nn islted D-D bst nverters required with redued swith vltge stress tehnique fr rviding high vltge gin withut extreme duty yle nd the use f trnsfrmer

          3= (3)

          1=2= (4)

          Now combine equation no. (1), (2), (3) and (4)

          1=2=3=1=2= (5)

          Fig 1 block diagram of proposed high gain converter.

        2. Case 2 (When Switch OFF)

        During the second Condition the switch is in OFF condition, diode D1 to D4 are in reverse biased and D5 is conducting. The voltage across inductor L1, L2, and L3 are the same. If their inductance values are the same as they are in series and the same current is following through them. The voltage across the inductors during this condition of operation can be obtained by applying KVL .


        Proposed converter simulate with the help of MATLAB/Simulink software. Then find the output voltage (53.08V), voltage across inductor L3 and current at output capacitor C3 graph in fig 2 and 3.

        Fig 2.Output waveform of converter during 0.50 duty ratio

        2. This double boost high gain converter the given output voltage 24.54V is lower then the proposed model at 0.5 duty cycle. There are also using two switches for boost output voltage which increases voltage stress. So the overall efficiency is also lower then proposed triple boost converter.

        Fig 5.Output waveform of double boost converter during 0.50 duty ratio


        In this paper you are tripling the DC-DC power converter proposed. The proposed converter is built from a single switch with a 0.5 duty ratio. The output voltage in the case of a proposed DC-DC converter is higher in terms of low performance compared to other parameters presented in Figure 2. For most converters, the loss is much higher in duty ratios, so similarly the output voltage, the proposed converter will work preferably as it will provide the same benefit as the minimum duty rate. Key advantages such as (a) high power gain (b) Smooth and continuous (non-ripple) drawing current from input (c) Flexible structure that provides the required maximum power gain while extracting smooth energy from the source. These key features prove that the proposed high profit converter is the ideal way to integrate a PV input source into standard grid, electric vehicles and other applications.


        Fig 3.Output waveform input voltage VL3, IC3 during 0.50 duty ratio

      4. COMPARISON WITH OTHER CONVERTERS Proposed converter is compared with the other high output voltage gain converters discussing as

1. According to given two tier high gain converter the given output voltage 33.5 V is lower then the proposed model at 0.5 lower duty cycle. There are using two switches for boost output voltage which increases voltage stress and decrease overall efficiency.

Fig 4.Output waveform of converter during 0.50 duty ratio

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