V/C Digital Controlled DC-DC Converter
R.Sravani1, P.Deepak Reddy2
1R.Sravani*, M.tech, Department of Electrical and Electronics Engineering, Lakireddy Bali Reddy College of Engineering, Mylavaram, India.
2P.Deepak Reddy, Associate Professor, Department of Electrical and Electronics Engineering, Lakireddy Bali Reddy College of Engineering, Mylavaram, India.
Manuscript received on August 01, 2020. | Revised Manuscript received on August 05, 2020. | Manuscript published on September 30, 2020. | PP: 167-175 | Volume-9 Issue-3, September 2020. | Retrieval Number: 100.1/ijrte.C4295099320 | DOI: 10.35940/ijrte.C4295.099320
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Abstract: In this paper, the switching of dc-dc converter using voltage/current digital control is proposed. It is the combination of existed digital average voltage and digital average current controls. The stability analysis of V/C digital controlled dc-dc converter is derived by using sampled data model. The transient analysis of V/C digital controlled dc-dc converter is also derived by using z-domain small signal model. The proposed V/C digital controlled dc-dc converter has over current protection, fast load transient response, no sub-harmonic oscillations at any value of duty cycle, and wider stability range. The proposed system is analysed with a simple buck converter. The output voltage and inductor current weighting factors influence the stability boundary and transient performances of V/C digital controlled dc-dc converter. The stability analysis and transient analysis is investigated and verified by circuit simulations.
Keywords: Sampled data modelling, stability analysis, transfer function, transient analysis, z-domain small signal modelling.