Browsing by Author "Mahant-Shetti, S.S.M."

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    A system level solution for power quality problems
    (2005) Padiyar U, U.H.; Mahant-Shetti, S.S.M.; Sumam David, S.
    The power quality deterioration is still an unsolved problem due to the increased power electronic load getting into the system. Every, consumer friendly equipment is power electronic controlled in one-way or other. The current drawn by all of these equipments are generally non-sinusoidal in nature, and are distorting the voltage wave as well. Many solutions proposed so far, though found useful in some cases have never become a system solution for the power quality deterioration problem. This paper proposes a unique innovative solution to these problems by a correction at the generation level by changing the shape of source wave keeping in view the nature of new loads. This paper presents PSPICE® simulated results to justify the need for source wave shape change, which will act as a system level solution to the limit peak currents drawn by the new generation power electronic loads. © 2006 IEEE.
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    A system level solution to improve VRM efficiency
    (2009) Padiyar U, H.; Sumam David, S.; Mahant-Shetti, S.S.M.
    An investigation of the synchronous buck regulator working as a Voltage regulator module (VRM) for Processor power supply applications, under light load condition is presented. VRM, a very special case of power supply belongs to switched mode power supply family. Important design specifications include low output voltage with extremely small tolerance band, high load current of large slew rates, small foot print, low cost etc. Higher operating efficiencies are desired to enable extended battery mode operation in mobile platforms in addition to reducing heat dissipation. This paper identifies the source of energy inefficiency and suggests a variable frequency approach as a cost effective system level solution, to enhance the efficiency of the converter supplying widely varying load with special emphasis to light load operation.