Journal of international Conference on Electrical Machines and Systems

Journal of International Conference on Electrical Machines and Systems (대한전기학회 분과)
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Unification of Buck-boost and Flyback Converter for Driving Cascaded H-bridge Multilevel Inverter with Single Independent DC Voltage Source

  • Kim, Seong-Hye (Dept. of Control and Instrumentation Engineering, Hanbat National University) ;
  • Kim, Han-Tae (Dept. of Control and Instrumentation Engineering, Hanbat National University) ;
  • Park, Jin-Soo (Dept. of Control and Instrumentation Engineering, Hanbat National University) ;
  • Kang, Feel-Soon (Dept. of Electronics and Control Engineering, Hanbat National University)
  • Received : 2013.05.07
  • Accepted : 2013.05.15
  • Published : 2013.06.01
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Abstract

It presents a unification of buck-boost and flyback converter for driving a cascaded H-bridge multilevel inverter with a single independent DC voltage source. Cascaded H-bridge multilevel inverter is useful to make many output voltage levels for sinusoidal waveform by combining two or more H-bridge modules. However, each H-bridge module needs an independent DC voltage source to generate multi levels in an output voltage. This topological characteristic brings a demerit of increasing the number of independent DC voltage sources when it needs to increase the number of output voltage levels. To solve this problem, we propose a converter combining a buck-boost converter with a flyback converter. The proposed converter provides independent DC voltage sources at back-end two H-bridge modules. After analyzing theoretical operation of the circuit topology, the validity of the proposed approach is verified by computer-aided simulations using PSIM and experiments.

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References

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