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Choosing the most suitable analogue redesign method for forward-type digital power converters

Cave-Ayland, K., Becerra, V., Potter, B. and Shirsavar, A. (2012) Choosing the most suitable analogue redesign method for forward-type digital power converters. In: IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), December 16-19, 2012, Bengaluru, India, pp. 1-6.

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To link to this item DOI: 10.1109/PEDES.2012.6484259

Abstract/Summary

This work proposes a method to objectively determine the most suitable analogue redesign method for forward type converters under digital voltage mode control. Particular emphasis is placed on determining the method which allows the highest phase margin at the particular switching and crossover frequencies chosen by the designer. It is shown that at high crossover frequencies with respect to switching frequency, controllers designed using backward integration have the largest phase margin; whereas at low crossover frequencies with respect to switching frequency, controllers designed using bilinear integration have the largest phase margins. An accurate model of the power stage is used for simulation, and experimental results from a Buck converter are collected. The performance of the digital controllers is compared to that of the equivalent analogue controller both in simulation and experiment. Excellent correlation between the simulation and experimental results is presented. This work will allow designers to confidently choose the analogue redesign method which yields the greater phase margin for their application.

Item Type:Conference or Workshop Item (Paper)
Refereed:Yes
Divisions:Faculty of Science > School of the Built Environment > Construction Management and Engineering
ID Code:32300
Uncontrolled Keywords:DC-DC power conversion, Digital control, Discrete transforms, Frequency domain analysis, Power electronics, Switched mode power supplies
Additional Information:Paper presented at the 2012 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), Bengaluru, India, December 16-19, 2012
Publisher:IEEE

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