A DC-DC Boost Converter with Extended Voltage Gain

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1 MATEC Web f Cnferences 4, 7 ( 26) DOI:./ mateccnf/ 2647 C Owned by the authrs, published by EDP Sciences, 26 A DC-DC Bst Cnverter with Extended Vltage Gain Muhammad Zeeshan Malik, Ajmal Farq, Amjad Ali, Guzhu Chen, Member, IEEE Cllege f Electrical Engineering, Zhejiang University, Hangzhu, China Abstract. In this paper a DC-DC bst cnverter with vltage extensin cell is intrduced t reduce lsses and vltage stresses n circuit cmpnents. Frm theretical analysis it has been analyzed that DC-DC bst cnverter cupled with extensin cell enhances its vltage gain, which imprve the life time f circuit cmpnents. Further t validate the prpsed methd, simulatin has been perfrmed in Matlab Simulink Sftware t cmpare the utput vltage f bst cnverter with and withut prpsed methd, result shws that the utput vltage f prpsed methd is 3V as cmpare t simple bst cnverter 2 V. Vltage stress in case f basic bst cnverter is 2V while fr bst cnverter with extensin cell is V. Intrductin Renewable energy surces have diverted the intentin f pwer prducers and pwer electrnics manufacturers t fulfill the electricity demands and mitigate energy crises. Different renewable energy surces (RES) such as wind, slar phtvltaic (PV) fuel cell (FC) are cmmnly used surces, but slar phtvltaic (PV) attracted the intentin f research in recent years because f its abundant availability [-3]. Slar PV prduces fluctuated utput vltage because f nn-unifrm slar irradiatins. Therefre, different types f DC-DC r DC-AC cnverter are being used t get required and stable utput. In [4] Interleaved bst cnverter with tw phases is presented, in which advantages f interleaved ver bst cnverter distributing input current because f its phases is discussed. This cnverter can be used in high pwer applicatins. The disadvantage f interleaved bst cnverter is that it is hard t cntrl due t phase displacement. The quadratic bst cnverter is presented in [3]. This cnverter has tw parts and each part wrk as a separate bst cnverter. Quadratic bst cnverter is capable fr high vltage gain but the main drawback is divisin f energy in tw parts, which causes high energy lss. A bst cnverter with tw intermediate capacitrs is discussed in [-6], in which cmparisn f tw cnverter tplgy with advantages f dubling the utput vltage because f intermediate capacitr fr high vltage applicatin is explained. And in [7-8] the bst cnverter with winding crss cupled inductr (WCCIs) is presented and tapped inductr bst cnverter tplgy with the advantage f high vltage gain because f magnetic prperties is prpsed in [9-2]. In this article a bst cnverter with vltage extensin cell is presented fr high vltage gain. Circuit diagram f the prpsed cnverter with extensin cell is depicted in figure-. The prpsed cnverter can achieve high vltage gain because f extensin cell and the capacitr, which tends t reduce nt nly vltage stress n the switches but als increase the verall system efficiency as well imprve the life f cnverter cmpnents because f lw stress. s is the equivalent inductance f the wire and it is ignred in the steady state analyze. s Figure. Bst cnverter with extensin cell 2 Operating principle f the prpsed cnverter: Figure-2 shws the circuit diagram f bst cnverter with prpsed extensin cell mdule. It cnsists f dide ( ) and ( ) as rectifying dides, () is filtering inductr and, S and S 2 are transistrs switches, (R ) is resistr lad and (V ) is utput vltage. Prpsed Extensin Mdule Figure 2. DC-DC Bst Cnverter with extended cell mdule C C i R i R This is an Open Access article distributed under the terms f the Creative Cmmns Attributin icense 4., which permits distributin, and reprductin in any medium, prvided the riginal wrk is prperly cited. Article available at r

2 MATEC Web f Cnferences The prpsed cnverter is perated with fixed switching frequency f khz and the switching perid is Ts. Switches,S and S 2 turn ON and turn OFF with tw PWM signals. S 2 and S are perated at ne PWM signal and the Sa is perated by 2 nd PWM signal, which is the inverse f st PWM. The steady state wave frms f the prpsed cnverter are depicted in figure-4. There are tw switching states with ne switching perid T s as shwn in figure-4 (a)&(b). i Figure-4. Steady state figure 2.2 State II (t t t 2 ) The time f this state is frm t =DT s t t 2 =T s and the circuit diagram f prpsed cnverter is shwn in figure- 3(b) where Dide, S and S 2 are turned OFF. The switch is ON and dide cnducts and partly current charges capacitr C O and partly it passes thrugh lad. C R (a) (t t t ) 2.3 Steady state analysis f the prpsed cnverter C i R In stage-i we can see in figure-3(a). When the switch and dide are in OFF mde. That time switch S and S 2 are ON. The state equatin in stage-i are shwn bellw. (b) (t t t 2 ) Figure 3. Operating mde f the prpsed cnverter 2. State I (t t t ) The time f this state is frm t = t t =DTs and the circuit diagram f prpsed cnverter is shwn in figure- 3 (a) where dide, switch S and switch S 2 are ON,while switch and dide are turned OFF. At this stage cnducts and current divides in tw parts. Partly it passes thrugh inductr and switch S partly it charges capacitr and passes thrugh switch S 2. At stage-ii we can see in figure-3(b) when switches S and S 2 are OFF and Switch is ON the state equatin in this stage are: V g 3 DC cnversin rati V R i V R Using the principle f inductr vlt secnd balance n inductrs () gives the vltage cnversin rati f the prpsed cnverter: V g,2 i V V ca V g after slving the equatin (7) we get: V g V V V g ca i i g C Again frm inductr vlt secnd balance f we get: a i i g V V RC after slving the equatin(9) we get: t i t t t t 2 t2 Frm (8) & () we get after slving equatin() we get 7-p.2

3 ICMES 2 in equatin (8) we knw V Ca =V g after put the V Ca value Frm equatin (3) we get vltage gain equatin belw: 3.2 Vltage Stress f devices in prpsed cnverter Using the circuit diagram f prpsed cnverter in state-i the vltage stress f switch Sa and dide are: Similarly, frm stage II, the vltage stress f dide, switch, and are: 3.. Ripple vltage and ripple current f cnverter In figure-3 f steady state, the peak t peak ripple current i equatin drawn belw: In figure-3 peak t peak vltage v and ripple vltage given in belw: 4 Simulatin results T validate the perfrmance f the prpsed cnverter, simulatins are dne in Matlab Simulink sftware fr bth prpsed and the traditinal DC-DC bst cnverters accrding t parameters given in Table- and cmparisn between bth the cnverters utput results are shwn in figure- (a)&(b) respectively. Table. Parameters f prpsed cnverter Name f parameter Symbl Value Output pwer P O 3W Input Vltage V S [V] Output Vltage V O 3 [V] ad Resistance R 3 [Ω] Frequency F S [khz] Filter inductr/phase.2 [mh] Intermediate capacitr C in 2[uF] Output capacitr C 6[uF] 7-p.3

4 MATEC Web f Cnferences 2 V Vda Vd V vs Vsa Vc a Vs2 -. Figure-(a). Simulatin result f prpsed cnverter 7-p.4

5 ICMES 2 V VD 2. Vs Figure-(b). Simulatin result f bst cnverter In figure-(a)&(b) simulatin results f bst cnverter with vltage extensin cell and simple bst cnverter are cmpared. It can be easily bserved that input vltage fr bth cnverters is vlts while utput vltage f bst cnverter with vltage extensin cell is nearly 3 vlts and that f simple bst cnverter is nearly 2V.The vltage stresses f switches in bst cnverter with extensin cell is much lwer, that is V, than that f simple bst cnverter which is 2V. Cnclusin A new tplgy f bst cnverter with vltage extensin cell is presented in this paper. The bst cnverter with vltage extensin cell enhances utput and reduces vltage stresses n switches and ther lsses which is clear frm bth simulatins and theretical results. It increases life time f circuit cmpnents due t lwer vltage stresses. Bst cnverter with extensin cell can be used in phtvltaic pwer generatin and ther lw input vltage and high utput vltage gain circuits. References. /P.ublicatins/Renewable_Energy_Technlgy_Ra dmap.pdf, Renewable Energy Technlgy Radmap 2% by (22) [Online] 2. M. Amirabadi, A. Balakrishnan, H. Tliyat, and W. Alexander, IEEE Trans. Ind. Electrn. 6, (24) 3. Sft-Switching AC-ink Three-Phase AC AC Buck Bst Cnverter, IEEE Trans. Ind. Elec. 62, (2) 4. A Perfrmance Cmparisn f Interleaved Bst Cnverter and Cnventinal Bst Cnverter fr Renewable Energy Applicatin, Prceedings f 23 Internatinal Cnference n Green High Perfrmance Cmputing, March 4-, (23), India. X. et al. Huang, Applied Pwer Electrnics Cnference and Expsitin, APEC, (23) 6. M. G. et al. Ortiz-pez, "Current-Mde Cntrl fr a Quadratic Bst Cnverter with a Single Switch," IEEE Pwer Electrnics Specialists Cnference, PESC, (27) 7. H. Nmura, K. Fujiwara, and M. Yshida, IEEE Pwer Electrnics Specialists Cnference, (26) 8. C. Yn, J. Kim and S. Chi, IEEE Trans. Pwer Electrn. 26, (2) 9. Z. Yi, W. i, Y. Deng and X. He, IEEE Trans. Pwer Electrn. 26, 4- (2). H. Z. Yang, J. iu, Research n Maximum Pwer Pint Tracking Cntrl Based n the w Pwer Phtvltaic Grid-cnnected Inverter,. IEEE Pwer Electrnics and Mtin Cntrl Cnference, (29), pp Y. R. De Nvaes, A. Rufer, I. Barbi, A New Quadratic, Three-evel, DC/DC Cnverter Suitable fr Fuel Cell Applicatin, IEEE Pwer Cnversin Cnf., (27), pp p.

Three-Level Boost Converter Design for High Efficiency Photovoltaic Power Conditioning System

Three-Level Boost Converter Design for High Efficiency Photovoltaic Power Conditioning System l.5 (CESCUBE 04), pp.687 http://x.i.rg/0.457/astl.04.5.6 ThreeLevel Bst Cnverter Design fr High Efficiency Phtvltaic Pwer Cnitining System Jins Kim, Oh Yang Electrnic Engineering f Chengju University,