three winding coupled inductor based parallel input …three winding coupled inductor based parallel...

Three winding coupled inductor basedparallel input serial output boost

converter

Lakshmi priya.M, 1 Ramesh babu.A, 2

1P.G Scholar,M.E Power Electronics and Industrial Drives,Sathyabama University,Chennai,India -603127

[email protected],2Assistant Professor,

Sathyabama University,Chennai,[email protected]

January 2, 2018

Abstract

Objective : This paper presents a three winding cou-pled inductor based boost converter for solar based/poweredapplications.

Methods/Statistical analysis :The proposed circuitdeal with parallel input with serial output boost converter.The design is aimed for reducing the voltage stress forachieving the ZVS and to reduce the leakage current by us-ing soft switching method. Converter is designed for higherfrequency ranges of 20 kHz ,the same is simulated usingMATLAB/SIMULINK .The output side connects the T-filter to reduce the output ripple voltage.

Findings :Converters based on coupled inductors ortransformer can be used to get high conversion with lessduty cycle. Voltage multiplier is connected on the secondarywinding for rising the voltage gain. Voltage gain is obtainedby varying the turns ratio and in addition leakage energy

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International Journal of Pure and Applied MathematicsVolume 118 No. 16 2018, 1073-1085ISSN: 1311-8080 (printed version); ISSN: 1314-3395 (on-line version)url: http://www.ijpam.euSpecial Issue ijpam.eu

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from inductor is also added to the capacitor in the out-put side for improving efficiency. Low rated switch reducesconduction losses with low RDS-ON. The proposed con-verters steady-state operational principles, circuit perfor-mance analysis, dc analysis (losses neglected) is performedto get the static voltage gain and voltage stress on power de-vices. Software results of existing and proposed convertersare compared.

Improvements/Applications :Nowadays, high volt-age gain dcdc boost converters play major role in various ap-plications such as Power supply for dc motor, Battery charg-ing, Telecom application, Inverter application and medicalequipments.

Keywords : Three winding coupled inductor; PV ar-ray; high step up converter; T-Filter; Low voltage stress;ZVS.

1 Introduction

The solar energy is the most promising, Non depletable and cleansource of energy. The photovoltaic (PV) power generation sys-tems is more popular in commercial and residential areas1,2 andcan reach to place where power line is impossible PV panel pro-duce low output voltage so it cannot make higher efficiency at PVinverter3 .PV output voltage is increased by means of various con-verter topologies4,5.The single phase boost6,7 provides more inputcurrent ripple, so rises the conduction loss of the switch. Interleavedhigh step-up boost converter8 with high efficiency high step-up9,10

techniques also observed. Parallel input serial output technique isused to increase the output efficiency by reducing voltage stressacross the switch11,12 and input voltage ripple .Inductor energy isrecycled by voltage multiplier cell13. For high power and high volt-age gain application Three winding coupled inductor based parallelinput, serial output boost converter is used.

Various methods like isolated boost converter, Transformer lessdcdc converters14 improved Flyback boost, will reduce the effi-ciency, increase cost and size. Multi phase interleaved15 high volt-

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age gain boost converters are introduced to get high power outputwith reduced voltage stress. The high step-up boost converter isused for high power application.

In this paper, two Mosfet switches are used each conducts al-ternatively with same phase difference of π to get high voltage gainand high power output.

The proposed converters steady-state operational principles aregiven in Section 2. The circuit performance analysis are the aimof Section 3, where an approximate dc analysis (losses neglected)is performed to get the static voltage gain and voltage stress onpower devices. The key parameter design guidance is presented inTable 2. Table 1 shows practical output of 500W prototype at fullload condition.

2 Literature review

Babu, A.R .et al.,4 used the interleaved technique for increasing thevoltage gain, for Photovoltaic (PV) application. The voltage stressacross the switch reduced by coupled inductor in the input. Theconduction loss and current stress across the switch are reduced byincreasing the number of phase. Yang.L.S, et al.,14, achieves highvoltage gain by using interleaved and switched capacitor.

3 Proposed Work

Figure 1: Proposed work of three winding coupled inductor basedboost converter

The proposed work of three winding coupled inductor basedboost converter is shown in Figure 1.It consists of two three wind-

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ing coupled inductor connected in parallel. Using this topologyvoltage gain is increased by coupled inductor on input and voltagemultiplier cell on output side. The proposed boost converter consistof two Metal Oxide Semiconductor Field Effect Transistor as themain switch S1 and S2 and Diodes D1, D2, D3 and D4 along withvoltage lift capacitor Cb and filter. Each switch is turned on withsame switching frequency with phase difference of π. The Dutycycle of proposed converter should be greater than or equal to 0.5to obtain voltage gain.

3.1 Modes of operation

There are three modes of operation explained below. Figure 2Shows Circuit Diagram of Three Winding Coupled inductor basedParallel Input Serial Output Boost Coupled.

A. Mode IBoth the switches of boost converter S1 and S2 are in on state,

diode D1, D2 and voltage multiplier cell diode D3 and D4 are inoff state. The inductor current of two boost converter is chargedby supply voltage.

B. Mode IIWhen the switch s1 of boost converter is on the inductor current

value gets increased. Meanwhile switch s2 of boost converter is off,the energy present in the inductor is passed to the output capacitorC3 and diode D4 connected on secondary of coupled inductor.

C. Mode IIIIn Mode III when the switch s2 of boost converter is on the in-

ductor current value gets increased. Meanwhile switch s1 of boostconverter is off, the energy present in the inductor is passed to theoutput capacitor C2 and diode D3 connected on secondary of cou-pled inductor. The magnetizing coil energy of inductor is releasedthrough D1 to voltage lift capacitor Cb.

The DC output voltage is given by:

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Vout =Vpk*(Ton/Tper) ——-(1)

Where Vpk=peak amplitude of the secondary pulses

Vout= (Vin-Switch)*(Cs/Cp)-Vrect———-(2)

Figure 2: Circuit Diagram of Three Winding Coupled inductorbased Parallel Input Serial Output Boost Coupled

3.2 Simulation of three winding coupled induc-tor based parallel input serial Output boostconverter

The proposed three winding coupled inductor based boost converteropen loop simulation is designed and simulated using MATLABsimulink .Figure 3 shows the Simulink model of solar panel withproposed circuit diagram presented.Table:2 shows the parameterused in the design of PWM controller in the open loop. The inputvoltage is 40V; the output voltage of boost converter with coupledinductor is increased to 420V. The increase in the output voltage isnullified by reducing the pulse width applied to the MOSFET of thePWM controlled converter. Here, a conventional PWM controlleras the simplest open-loop is designed to determine the firing angleto control the output voltage. For this purpose, first, the voltage

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error signal, which is the difference of the reference and measuredvoltages, Figure 4 shows Simulink model of three winding coupledinductor based parallel input, serial output boost converter.

Figure 3: Simulation circuit of Solar panel with MPPT

Figure 4: Simulink model of three winding coupled inductor basedparallel input, serial output boost converter

3.2.1 Output voltage waveform of solar panel

Figure 5: Solar panel output waveform

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Figure 5 shows the output of solar panel. The output voltagefrom PV panel is 40v. The output current of PV cell is propor-tional to irradiance. The simulated model PV panel is very goodapproximation of PV. The PV output voltage oscillates between 12volt and 40 volt.

3.2.2 PWM signal of Switch S1, S2

Figure 6: PWM signal of Switch S1, S2

The figure.6 shows that PWM signal for switch S1 and S2.BothPWM signals have equal phase difference of 1800. The PWM sig-nals are generated by switching frequency of 20 KHz but duty ratiois selected by MPPT algorithm based on maximum power output.

3.2.3 Switching pulse of S1 & Vds

Figure 7: Switching pulse of S1 & Vds

The figure 7 shows the switching pulse of S1 and Vds. Thevoltage stress across the switch reduces as conduction losses arereduced compared to conventional converter.

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3.2.4 Output voltage

Figure 8: Output voltage of parallel input , serial output boostconverter

The figure 8 shows the Output voltage of parallel input, serialoutput boost converter. The proposed converter output voltageis 420v that is two times output of conventional boost converter.Comparison is shown in table 1.

3.2.5 Output ripple voltage

Figure 9: Waveform of output ripple voltage

The figure 9 indicates the output ripple voltage which is lessthan 0.6v.The ripple voltage is reduced by adding the T-filtering atthe output side of the boost converter.

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3.2.6 Output current and Output Power of boost con-verter

Figure 10: Waveform of output current

Figure 11: Waveform of Output power

Figure 11 indicates the output power of the proposed boost con-verter .The proposed converter produces the output power of 1000wwhich seems to be increased as output voltage and current is in-creased.

Table 1: Comparison of coupled inductor based boost converter

Coupled inductor based boostconverter

Conventionalconverter

Proposedconverter

Inputvoltage

40v 40v

Outputvoltage

204v 420v

Outputcurrent

1.1A 2.4A

Outputvoltage ripple

8v 0.5v

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Table 2: Parameters used in the simulation studies

Parameters valueInput

voltage40v

Outputvoltage

420v

Switchingfrequency

20KHZ

L1&L2 2.6mHCapacitance 20 µFLoad(resistance) 500 Ω

4 CONCLUSION

In this paper, three winding coupled inductor based parallel input,serial output boost converter with open loop system has been pro-posed and their results are simulated using MATLAB/SIMULINKsoftware. From the simulation result we conclude that Voltage con-version ratio is almost doubled when it is operated with two switchat the duty cycle of converter is greater than 0.5.. This paper alsopresents conventional method generating more ripple voltage (8v)and high voltage stress .The proposed method by using ZVS turn onmethod generates reduced voltage ripple (0.5v) and reduced volt-age stress. Performance parameters such as voltage stress, voltageripple, voltage gain of conventional and proposed method are com-pared in table 1. Comparetively output voltage ratio also increased.

References

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[2] Babu A R, Raghavendiran T A, Analysis of non-isolated twophase interleaved high voltage gain boost converter for PV ap-plication, In Control, Instrumentation, Communication andComputational Technologies (ICCICCT), 2014 InternationalConference on IEEE,2014, pp. 491-496.

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three winding coupled inductor based parallel input …three winding coupled inductor based parallel...

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