bridgeless pfc boost converter with flc · l.martnez-salamero loss-free resistor based power...

BRIDGELESS PFC BOOSTCONVERTER WITH FLC

R. Meena Devi1, V.Geetha2,M. Kavitha3, M.Preethi Pauline Mary4

Sathyabama Institute of Science and TechnologyChennai, India.

[email protected],[email protected],

[email protected],[email protected]

June 21, 2018

Abstract

A new Bridgeless boost AC to DC converter using Fuzzylogic controller is discussed. Power factor and THD is con-centrated and they are regulated using voltage and currentcontrolling method. The proposed converter has two boostconverters each for one half cycles producing a output volt-age of 490V. The comparison of the regulated parameter fortwo different controller is depicted and proved that a FLCproduce a suitable output for the specified application witha output ripple voltage of 8V, power factor of 0.9859 and acurrent of 3 A which improves the reliability of the designedconverter. The prototype of bridgeless boost converter val-idates the simulated result.

Keywords: Bridgeless boost ac-dc converter, Continu-ous Conduction Mode, Power Factor Correction (PFC) com-ponent.

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International Journal of Pure and Applied MathematicsVolume 120 No. 6 2018, 6281-6294ISSN: 1314-3395 (on-line version)url: http://www.acadpubl.eu/hub/Special Issue http://www.acadpubl.eu/hub/

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1 INTRODUCTION

Now days converters are widely used in most of the electronic appli-ances. For the converted power to be efficient we need to improvisethe power factor and reduce the total harmonic distortion at theinput side[1].For the improvement of line current with reduction inline current harmonics is made by two technique,active and passive. Filter is designed to reduce the harmonics with LC Component.In active techniques components such as switches are also usedalong with the passive components [2]-[4]. Compared to passivetechniques active techniques are more efficient.

The techniques of correcting the power factor with less usageof components and commanding the input line current to followthe input voltage that is making the phase difference between themto be unity[5]-[6].The buck, buck boost converter is best suitedfor medium ,low power application because of its lower electro-magnetic interference, provided boost provides the continuous linecurrent and less filtering components compared to the other typeswhich provides pulsating line current cannot be applicable for theapplications specified[6]-[9].Influencing the low and medium powerapplication boost converter also handled high power applicationsalso with power factor correction technique[10]-[14].Different typesof converter are been analyzed and the specifications are reviewedin [8].

In [11] controllers for the bridgeless converter is depicted and theresults proved to be fuzzy controller enhancing the better correctedpower factor compared to the other controller. This paper describesabout the reliability condition of the converter which is improvedwith over the types of controllers and there are different sectionsdescribing the organization of the paper.

2 BRIDGELESS PFC (BOOST) CON-

VERTER USING PID CONTROLLER

The Bridgeless PFC(boost) Converter is an AC to DC converterwhich can be used for high power applications. The schematic di-agram of Bridgeless boost PFC converter using PID controller isshown in Figure 1. Here the bridgeless boost converter does not

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require a filtering circuit which makes the circuit bulky,it requiresonly a capacitor is sufficient for filtering to make current contin-uous. But the other types of converters require a filtering circuitseparately.

It consists of two boost converters one for positive half cycleand other for negative half cycle. In this power factor correctionis done by using feedback control one with voltage, and other bycurrent control. The output voltage is taken and the voltage er-ror is calculated by subtracting it from reference voltage and isconverted into reference current by the value of output resistanceand multiplying it with rectified sinusoidal wave, this is subtractedfrom inductor current to get current error and the current erroris passed through the PID controller and the signal from the con-troller is compared with the signal from signal generator and thecompared signal is passed through the PWM generator, generatedPWM signal is given to the switch for turning it on and off. WhenS1 is turned on, L1 charges and when it gets turned off currentstored in inductor gets discharged. The operation of S2 is viceversa of switch S1.

Table 1: SPECIFICATION OF THE PROPOSED SYSTEM

A. Simulation of the proposed bridgeless boost con-verter using PID controller

Figure 2 shows the simulation of bridgeless boost AC to DCconverter; Simulation has been done using Simulink in MATLAB.The Figure 3 depicts the input current and input voltage waveforms;Figure 4 shows the output voltage and current waveforms using PID

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Controller. The specifications of the bridgeless PFC converter aredepicted in the Table 1.

Iref = ((V ref − k1V o)/k2 ∗R(t))|sin(wt)| (1)

R(t) = V ref/Io (2)

Figure 1: Bridgeless Boost Converter with PID controller

3 BRIDGELESS BOOST PFC CON-

VERTER USING FUZZY LOGIC

CONTROLLER

Previously Bridgeless boost PFC converter has been using PID con-troller but in this paper Bridgeless boost PFC converter using fuzzylogic controller has been used as shown Figure 5 to reduce the har-monic distortion, to improvise the phase between current and volt-age and to improve DC output power quality.

In this topology power factor and total harmonic distortion areimprovised by using voltage control and current control methodsand power quality of output is improved by the regulation of output.As in this method two converters are used one for positive half cycle

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Figure 2: Simulation of Bridgeless Boost PFC with PID controller

Figure 3: Input Voltage and Current Waveform

and another for negative half cycle the operation of converter canbe explained for both the cycles separately.

During each half cycle charging and discharging of the inductorstake place. This converter can be used in both (CCM) and (DCM).If both the voltage control loop and current control loop are used infeedback then it operates in CCM and if only voltage control loopis used then it operates in DCM.

A. Simulation of the proposed bridgeless boost con-verter using fuzzy logic controller

Figure 6 shows simulation circuit diagram of system, Figure 7shows the input voltage and current waveforms, Figure 8 shows the

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Figure 4: Output Voltage and Current Waveform

output voltage and current waveforms, Figure 9 shows the pulsewidth modulated signal which is an input for switches and Figure10 shows the output surface diagram and Table 2 discusses the rulesof the fuzzy system.

4 RESULTS AND DISCUSSION

The summary of the proposed bridgeless PFC converter is depictedin the following table, which proves to be efficient compared to theconventional system. the different rules where framed to reach thedesired result which is settling time taken by both the controllerand the voltage ripple in the output ,power factor improvement inthe proposed circuit is concentrated.

5 CONCLUSION

Simulation of the bridgeless PFC (Boost) converter is carried outusing MATLAB simulink, where the various parameters are con-centrated to keep the voltage and current at the output side to bein phase .Here controller are compared and output ripple voltageis found to be 8V which is less compared to the PID, The settlingtime of the output wave is calculated from the output waveform.To check the power factor variation with different loaded condi-

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Figure 5: Bridgeless Boost PFC converter using fuzzy logic con-troller

tion a table is presented. Thus the simulation results prove thatFLC controls the parameter to a system to be in a highly reliableand distortion free.

References

[1] G.V. Torrico-Bascop and I.Barbi, A single phase PFC 3 KWconverter using a three-state switching cell, in Proc. PowerElectronic. Spec. Conf., 2004, vol. 5, pp. 40374042.

[2] A. Marcos-Pastor, E. Vidal-Idiarte, Loss-free resistor basedpower factor correction using a semi bridgeless boost recti-

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Figure 6: Simulation of Bridgeless Boost PFC with Fuzzy Con-troller

Figure 7: Input Voltage and Current Waveform

fier using sliding mode control in IEEE transactions on powerelectronics in 2013.

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Figure 8: Output Voltage and Current Waveform

Figure 9: PWM Signal

Figure 10: Surface View of the Fuzzy Logic System

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Table 2: FUZZY RULE TABLE

Table 3: LOAD VS POWER FACTOR

[3] W. Wei, L. Hongpeng, J. Shigong, and X. Dianguo, A novelbridgeless buck-boost PFC converter, in Proc. IEEE PowerElectron. Spec. Conf.,2008, pp. 13041308.

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Table 4: COMPARISON OF THE PROPOSED WITH THE CON-VENTIONAL SYSTEM

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bridgeless pfc boost converter with flc · l.martnez-salamero loss-free resistor based power...

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