Closed Loop Control Scheme For A DC-DC SEPIC Converter


Closed Loop Control Scheme For A DC-DC SEPIC Converter

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In this paper, a closed loop control scheme for DC-DC SEPIC converter that realizes a regulated dc output voltageis discussed in detail. The converter equations corresponding todifferent modes of operation of the converter are developed. ThePI controller using loop shaping method issystematically developed. Simulations studies are carried outto confirm the effectiveness of the suggested control strategyunder large perturbations.


In previous system, the output voltage is not controlled. It is an open loop DC-DC converter. It has large amount of voltage variations comparing to the proposed system. There is no control block in the existing system. Losses of the system. Depends up on load controlled the voltage.


In the proposed topology, solves the all problems in the previous system. The proposed topology has closed loop function with PI algorithm technique. This technique is used to control the output voltage. This proposed system gives a regulated output and increase the output efficiency.




  • Input supply:- AC
    • Driver circuit: -It can be used to amplify the 5V pulses to 12V for using transistor technology and provided isolations for using opto coupler. It has two functions,
      • Amplification
      • Isolation
      • Pulse generator: – Here we have used PIC microcontroller (PIC 16F877A) to make a switching signal.


  • High efficiency.
  • Reducing the commutation losses
  • Higher static gain
  • Reducing the converter duty cycle and the switch voltage.
  • Decided output due to close loop 


  • SMPS
  • Solar panel
  • Portable electronic equipment


In the present paper, the modes of operation of DC-DCSEPIC converter have been analysed. The open loopresponse obtained for the model is found to be oscillatory andalso has finite steady state error. Hence, to obtain a satisfiedresponse a proportional integral controller is systematicallydeveloped whose specifications are attained by loop shapingmethod. The controller gain values obtained so are used in theclosed loop control scheme of SEPIC. Simulation resultshighlight the effectiveness of the closed loop control strategy.


[1] Teena Jacob and Arun S, “Modeling of Hybrid Wind and Photovoltaic Energy System Using a New Converter Topology,” Electrical and Electronics Engineering: An International Journal (EEEIJ) vol.1, no.2, August 2012.

[2] Ray Ridley, “Analyzing the SEPIC converter,” Power System Design Europe, Nov 2006.

[3] Robert W. Erickson and Dragan Maksimovic, “Fundamentals of Power Electronics,” Springer, 2001.

[4] M.H. Taghvaee, M.A.M Radzi, S.M. Moosavain, Hashim Hizam and M. Hamiruce Marhaban, “A Current and Future Study on Non-isolated DCDC converters for Photovoltaic Applications”, Renewable and sustainable energy reviews, vol. 17, pp. 216-227, 2013.

[5] Ahmad H. El Khateb, Nasrudin Abd Rahim and Jeyraj Selvaraj, “Fuzzy Logic Control Approach of A Maximum Power Point Employing SEPIC Converter For Standalone Photovoltaic System”, Procedia Environmental Sciences,vol.17, pp.529-536, 2013.

[6] K.M. Tsang and W.L. Chan, “Fast Acting Regenerative DC Electronic Load Based on A SEPIC Converter”, IEEE Transactions on Power Electronics, vol. 27, no.1, pp.269-275, 2012

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