"Multiphase converters are increasingly gaining prominence in the field of power electronics. The main advantage of a multiphase converter is its increased efficiency in comparison to a single phase converter. The one major drawback of a multiphase converter is its light load efficiency. Light load efficiency in multiphase converters is very poor when compared to single phase converters. Phase shedding is one of the approaches used to improve this light load efficiency but the transient output voltage response of the system shows large deviations during the process of phase change. This thesis proposes a new technique, called the ramp control technique, to improve this transient behavior. Ramp control technique, proposes to gradually shed a phase or phases of the converter at light loads, instead of abruptly shutting it down. This is done by decreasing the duty cycle of the phase gradually to zero. In this thesis, a moving average model of the ramp control technique is constructed and the slope required for this technique is calculated on the basis of different parameters. The performance of the ramp control technique is also compared with the various conventional methods proposed in literature and it has been proved analytically and through simulation results that the ramp control technique has better dynamic performance when compared to the conventional methods."--Abstract, page iii.
Kimball, Jonathan W.
Electrical and Computer Engineering
M.S. in Electrical Engineering
Missouri University of Science and Technology. Intelligent Systems Center
Missouri University of Science and Technology
xii, 85 pages
© 2014 Anagha Rayachoti, All rights reserved.
Thesis - Open Access
Electric current converters -- Computer simulation
Electronic OCLC #
Rayachoti, Anagha, "Improved phase shedding technique in a multiphase converter system" (2014). Masters Theses. 7272.