Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Analysis and Implementation of a DC-DC Converter with an Active Snubber

  • Lin, Bor-Ren (Dept. of Electrical Eng., National Yunlin University of Science and Technology) ;
  • Lin, Li-An (Dept. of Electrical Eng., National Yunlin University of Science and Technology)
  • Received : 2011.01.16
  • Published : 2011.11.20
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Abstract

This paper presents a soft switching converter to achieve the functions of zero voltage switching (ZVS) turn-on for the power switches and dc voltage step-up. Two circuit modules are connected in parallel in order to achieve load current sharing and to reduce the size of the transformer core. An active snubber is connected between two transformers in order to absorb the energy stored in the leakage and magnetizing inductances and to limit the voltage stresses across the switches. During the commutation stage of the two complementary switches, the output capacitance of the two switches and the leakage inductance of the transformers are resonant. Thus, the power switches can be turned on under ZVS. No output filter inductor is used in the proposed converter and the voltage stresses of the output diodes is clamped to the output voltage. The circuit configuration, the operation principles and the design considerations are presented. Finally, laboratory experiments with a 340W prototype, verifying the effectiveness of the proposed converter, are described.

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References

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