An energy buffer for constant power loads
Author(s)
Gutierrez, Manuel, (Scientist in electrical engineering and computer science) Massachusetts Institute of Technology
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Other Contributors
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science.
Advisor
Steven B. Leeb, Peter Lindahl and Arijit Banerjee.
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Show full item recordAbstract
Constant power loads (CPLs) are a class of loads steadily increasing in use. They are present whenever a load is regulated to maintain constant output power, such as with LED drivers in high quality lighting that is impervious to input fluctuations. Because CPLs exhibit a negative incremental input impedance, they pose stability concerns in DC and AC systems. This thesis presents a power converter for a constant power LED bulb that presents a favorable input impedance to the grid. The use of an energy buffer allows the converter to draw variable power in order to resemble a resistive load, while the output consumes constant power. A switched-mode power supply consisting of a cascaded boost and buck converter accomplishes this by storing energy in the boost stage output capacitor. Experimental results demonstrate that the converter exhibits a resistive input impedance at frequencies over 0.5 Hz while maintaining constant power to the LED load.
Description
Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017. Cataloged from PDF version of thesis. Includes bibliographical references (pages 111-113).
Date issued
2017Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer SciencePublisher
Massachusetts Institute of Technology
Keywords
Electrical Engineering and Computer Science.