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A new interleaved high step up converter with low voltage stress on the main switches

  • Tohidi, Babak (Department of Electrical Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University) ;
  • Delshad, Majid (Department of Electrical Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University) ;
  • Saghafi, Hadi (Department of Electrical Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University)
  • Received : 2020.02.01
  • Accepted : 2020.06.13
  • Published : 2020.10.25
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Abstract

In this paper, a new interleaved high step-up converter with low voltage stress on the switches is proposed. In the proposed converter, soft switching is provided for all switches by just one auxiliary switch, which decreases the conduction loss of auxiliary circuit. Also, the auxiliary circuit is expanded on the converter with more input branches. In the converter all main switches operate under zero voltage switching condition and auxiliary switch operate under zero current switching condition. Because of the interleaved structure, the reliability of converter increases and input current ripples decreases. The clamp capacitor in the converter not only absorb the voltage spikes across the switch due to leakage inductance, but also improve voltage gain. The proposed converter is fully analyzed and to verify the theoretical analysis, a 100 W prototype was implemented. Also, to show the effectiveness of auxiliary circuit on conduction EMI, EMI of the proposed converter comprised with hard switching counterpart.

Keywords

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