SEPIC Converter with Interleaved Inductors and LLC Circuit for … · 2018. 9. 29. · SEPIC Converter with Interleaved Inductors and LLC Circuit for LED driver Mrs. A. Sahaya Ponrekha1,

SEPIC Converter with InterleavedInductors and LLC Circuit for LED

driver

Mrs. A. Sahaya Ponrekha1, Shambhashib Narayan Roy2,Bhaskar Saha3, Joydip Shil4

Department of Electrical and Electronics and EngineeringSRM Institute of Science and Technology

Chennai, [email protected]

June 23, 2018

Abstract

A single stage driver has been produced coordinatingSEPIC with half-resonant LLC full converter integrated withinterleaved connection. Presented circuit makes the sys-tem economic, improving unwavering quality. The LLC fullpart keeps up soft switching qualities and reduces switch-ing losses. Because of cautious design, system input voltagecan be less as required in high voltage drive. A few analysesutilizing a 100-W model were performed to approve hypo-thetical investigation. The proposed topology reduces thecurrent stress across the switches and hence increases thedurability of the circuit. Hypothetical investigations werebasically done using MATLAB. We have basically used anArduino board for generating the pulses and a Driver Cir-cuit that will control another circuit or components in thesystem. Hence its practical usage can be implemented inthe automobile sector.

Key Words: Interleaved connection, SEPIC, LLC fullconverter.

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International Journal of Pure and Applied MathematicsVolume 120 No. 6 2018, 1827-1839ISSN: 1314-3395 (on-line version)url: http://www.acadpubl.eu/hub/Special Issue http://www.acadpubl.eu/hub/

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1 INTRODUCTION

Due to high productivity, long life and quick reaction, regular lightsources are supplanted by LEDs. LEDs have been generally utilizedas a part of road lighting, car, private lighting, and different fields[1-4]. Ordinary LED drivers, are important to adjust input busvoltage to LED prerequisites, comprise of two phases of circuits [5-10]. Many components are used by them, bringing about complexcontrol and high cost. To overcome these single-stage convertershave been used [11-17] and resonant converters were profoundlyexamined [18-21].The single-stage converters mostly use boost structure .In the booststructure decreases the size of the filter. Even though the disad-vantage of LED drivers are the increase of input voltage due to theintrinsic boost characteristics. A converter with boost structureand LLC circuit is proposed in paper [22].If the supply is 210-230 Vac, the DC output bus voltage has to bereduced. This can be achieved using a SEPIC or buck-boost con-verter. The effect of electro magnetic interference on buck boostconverters are more [16]. But the input inductor of SEPIC reducethe input side current ripple. The output current ripples are re-duced due to the inductor in the yield side[23-25].Paper[26] proposed SEPIC and LLC resonating circuit which lessensswitches count due to sharing of switches and used single controlstage for both the switches. But in that topology current stressthrough the first switch was very high.So this paper presents SEPIC Converter with Interleaved Inductorsand LLC Circuit. The interleaved inductors makes the current tobe divided through inductors and switches which reduces the cur-rent stress through the switches. In addition this topology giveswide range of voltages over previous topologies.This paper is composed as follows: area II exhibits the proposedcircuit topology. Area III exhibits the modes of operation of the cir-cuit. Area IV represents the simulation result of the 100 W model.Area V reports a conclusion.

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2 Operating principle of the proposed

converter

Circuit topology

In figure1 the topology of the proposed converter which haveSEPIC, interleaved connection and LLC resonant circuit. SEPICconverter consists of L1, L2 inductors, D1 diode,C1, C2 capacitorsand S1,3 switch. The interleaved connection comprises of an induc-tor L, diode D and switch S, connected parallel to the switch S1,diode D1 and inductor L1. The LLC circuit comprises of switchesS2 and S1,3, Lr and Cr resonant circuit, a transformer and a recti-fier.The inductors which are in the input and output side reduce thecurrent ripples in the input and output sides. The inter leaved con-nection divides the current through the switches and thus reducesthe current stress in the switches. Due to soft switching qualitiesof LLC resonating converter, switching losses lessen, thus generalsystem productivity increments, and the converter can be utilizedas a part of high frequency operations.

Figure 1 Circuit Diagram

3 MODE OF OPERATIONS:

Mode 1: The switches S and S1 are ON and S2 remains OFF. Theinductor L and L1 charges. Current direction remains same in bothL and L1 and diodes D and DPFC are used to restrict the reverse

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flow of current.The magnetizing current through the transformer isdecreasing. The resonant circuit Lr and Cr feeds the load.

Figure 2 Mode 1

Mode 2: The switch S2 remains ON and S, S1 remains OFF.The capacitor C2 charges and C1 discharges. The inductor L and L1

also discharges but the direction of L gets reversed. The resonat-ing current goes to zero which make diode DPFC to be forwardbiased.Then at ZVS( Zero Voltage Switching) state S2 gets turnson. D3 is on and D4 turns off. The resonator is composed of Lr,Cr and Lm in this mode. The current through L1 and L2 is attaingtheir maximum values .When S1, 3 is getting turns off this modestops.

Figure 3 Mode 2

Mode 3: All the three switches remains ON, all the capacitorand inductor charges and diode DPFC reverse biases along withinductor Lr. With ZCS(Zero Current Switching) D3 diode gets off

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which separate input and output sides. Switch S2 get turns off.After the ending of this mode all the modes of operation will berepeated.

Figure 4 Mode 3

4 SIMULATION RESULT

Figure 5 MATLAB Simulation

TABLE I Parameter values

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Figure 6 Input Voltage Waveform: 10v

Figure 7 Output Voltage Waveform: SameValue ( DutyCycle:16%O/P: 11V )

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Figure 8 Output Voltage Waveform: SameValue ( DutyCycle:2%O/P: 0.7V )

Figure 9 Output Voltage Waveform: SameValue ( DutyCycle:95%O/P: 56 V )

Figure 10 Plot of Output Voltage vs Duty Cycle

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Figure 11 Current stress in the existing topology

Figure 12 Current stress in the proposed topology

To prove the advantage of proposed topology compared to theexisting a single stage LED driver based on SEPIC and LLC cir-cuits [26] the existing system is simulated in matlab In the existingsystem it has been shown that the current stress in the circuit isupto 80 V, which is much higher than the presented system, whichis around 35V. Thereby the current stress is getting reduced in thepresented circuit.

5 CONCLUSION

This paper presented a converter, which is the combined arrange-ment of SEPIC, interleaved inductors and LLC circuits. In this

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paper by the introduction of the interleaved inductors arrangementthe current stress in the switches are reduced, hence reducing thecost and improving the reliability. It can be used for wide voltagecontrol as because its output can be boosted upto 5.6 times. Sothis LED drive system is suitable for wide range of input voltage.

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SEPIC Converter with Interleaved Inductors and LLC Circuit for … · 2018. 9. 29. · SEPIC Converter with Interleaved Inductors and LLC Circuit for LED driver Mrs. A. Sahaya Ponrekha1,