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Control-to-output Transfer Function of the Open-loop Step-up Converter in CCM Operation

  • Wang, Faqiang ;
  • Ma, Xikui
  • Received : 2013.10.06
  • Accepted : 2014.03.01
  • Published : 2014.09.01

Abstract

Based on the average method and the geometrical technique to calculate the average value, the average model of the open-loop step-up converter in CCM operation is established. The DC equilibrium point and corresponding small signal model is derived. The control-to-output transfer function is presented and analyzed. The theoretical analysis and PSIM simulations shows that the control-to-output transfer function includes not only the DC input voltage and the DC duty cycle, but also the two inductors, the two energy-transferring capacitors, the switching frequency and the load. Finally, the hardware circuit is designed, and the circuit experimental results are given to confirm the effectiveness of theoretical derivations and analysis.

Keywords

Step-up converter;Average model;Small signal model;Control-to-output transfer function

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