24V Step-down converter
Author
Rwagasore, Mucunguzi
Term
7. term
Education
Publication year
2017
Submitted on
2017-03-14
Pages
48
Abstract
Denne bacheloropgave omhandler analyse, dimensionering og styring af en 24 V DC/DC step-down (buck) konverter til at forsyne Balance of Plant (BOP)-komponenter i et brændselscellesystem, såsom pumper, blæsere og styre-elektronik. Projektets hovedspørgsmål er, hvordan en buck-konverter og tilhørende regulator kan udformes, så der opnås en stabil og konstant udgangsspænding på 24 V. Arbejdet omfatter gennemgang af buck-konverterens virkemåde, analyse af lednings- og koblingstab, komponentvalg og dimensionering samt småsignallering af konverteren under konstant on-time strøm-mode kontrol. En Type II PI-kompensator designes for at sikre spændingsregulering, og systemets stabilitet vurderes i Matlab ved hjælp af overføringsfunktioner og loop-analyse. Endelig simuleres hele konverterskemaet med regulator. Fokus er på design og stabilitetsvurdering i simulering; der indgår ikke eksperimentelle målinger eller testresultater i dette arbejde.
This bachelor thesis addresses the analysis, sizing, and control of a 24 V DC/DC step-down (buck) converter intended to supply Balance of Plant (BOP) components in a fuel cell system, such as pumps, blowers, and control electronics. The central question is how to design a converter and controller that provide a stable, constant 24 V output. The work covers the operating principles of the buck converter, conduction and switching loss analysis, component selection and dimensioning, and small-signal modeling under constant on-time current-mode control. A Type II PI compensator is designed to ensure voltage regulation, and system stability is assessed in Matlab using transfer-function and loop analysis. The complete converter with controller is then simulated. The project focuses on design and simulation-based stability evaluation; no experimental hardware testing or measured results are included.
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