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Smart Structures and Systems Volume 25, Number 3, March 2020 , pages 385-391 DOI: https://doi.org/10.12989/sss.2020.25.3.385 |
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A new lossless snubber for DC-DC converters with energy transfer capability |
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Shabnam Nasr Esfahani, Majid Delshad and Mohhamad Bagher Tavakoli
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| Abstract | ||
| In this paper, a new passive lossless snubber circuit with energy transfer capability is proposed. The proposed lossless snubber circuit provides Zero-Current Switching (ZCS) condition for turn-on instants and Zero-Voltage Switching (ZVS) condition for turn-off instants. In addition, its diodes operate under soft switching condition. Therefore, no significant switching losses occur in the converter. Since the energy of the snubber circuit is transferred to the output, there are no significant conduction losses. The proposed snubber circuit can be applied on isolated and non-isolated converters. To verify the operation of the snubber circuit, a boost converter using the proposed snubber is implemented at 70W. Also, the measured conducted Efficiency Electromagnetic Interference (EMI) of the proposed boost converter and conventional ones are presented which show the effects of proposed snubber on EMI reduction. The experimental results confirm the presented theoretical analysis. | ||
| Key Words | ||
| lossless passive snubber; proposed converter; soft switching; zero-current switching (ZCS); zero-voltage switching (ZVS); Efficiency electromagnetic interference (EMI) | ||
| Address | ||
| (1) Shabnam Nasr Esfahani, Mohhamad Bagher Tavakoli: Department of Electrical Engineering, Arak Branch, Islamic Azad University, Arak, Iran; (2) Majid Delshad: Department of Electrical Engineering, Isfahan(Khorasgan) Branch, Islamic Azad University, Isfahan, Iran. | ||