<p>A floating output, non-isolated step-up DC–DC converter topology is presented, using two switches that produce addition of voltage to either side of the input DC voltage bus without the utilization of any transformer or coupled inductors. Interleaving the switching operation with 180° phase shift between them creates considerable reduction in input current ripple as well as output voltage ripple. Since a part of the load power flows in directly from the input, each switch does not handle the entire output power. This results in minimizing the current and voltage ratings of the semiconductor devices, improving the overall system efficiency. A higher voltage boost is generated than conventional DC–DC boost converter for same duty cycle. The Continuous Conduction Mode (CCM) is studied through various conduction states of the converter. Modeling, simulation and experimental study verifies the practicality of the proposed scheme with improved performance. The proposed scheme is suitable for voltage boost requirements in solar PV, battery backup or fuel cell applications. Due to the symmetrical addition of voltages on both sides of the incoming DC bus, the proposed converter can be used to create multiple DC voltage levels for multilevel inverters.</p>

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A Dual-Switch Step-Up DC–DC Converter with Non-isolated Floating Output and Improved Performance

  • Koustuv Sarkar,
  • Dipten Maiti,
  • Abanishwar Chakrabarti,
  • Sujit K. Biswas

摘要

A floating output, non-isolated step-up DC–DC converter topology is presented, using two switches that produce addition of voltage to either side of the input DC voltage bus without the utilization of any transformer or coupled inductors. Interleaving the switching operation with 180° phase shift between them creates considerable reduction in input current ripple as well as output voltage ripple. Since a part of the load power flows in directly from the input, each switch does not handle the entire output power. This results in minimizing the current and voltage ratings of the semiconductor devices, improving the overall system efficiency. A higher voltage boost is generated than conventional DC–DC boost converter for same duty cycle. The Continuous Conduction Mode (CCM) is studied through various conduction states of the converter. Modeling, simulation and experimental study verifies the practicality of the proposed scheme with improved performance. The proposed scheme is suitable for voltage boost requirements in solar PV, battery backup or fuel cell applications. Due to the symmetrical addition of voltages on both sides of the incoming DC bus, the proposed converter can be used to create multiple DC voltage levels for multilevel inverters.