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Precision calorimetry for power loss measurement of a very low power maximum power point tracker

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Open access
Authors
Wolfs, Peter
Li, Q.
Date
2007
Type
Conference Paper

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Citation
Wolfs, Peter and Li, Q. 2007. Precision calorimetry for power loss measurement of a very low power maximum power point tracker, in Islam, S. (ed), Power Engineering Conference, AUPEC Australasian Universities, Dec 9 2007, pp. 1-5. Perth WA: Curtin University.
Source Title
Power Engineering Conference, 2007. AUPEC 2007. Australasian Universities
Source Conference
Power Engineering Conference, AUPEC Australasian Universities
ISBN
Faculty
Department of Electrical and Computer Engineering
School of Engineering
Faculty of Science and Engineering
Remarks

Australasian Universities Power Engineering Conference 2007.

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Abstract

Efficiency is an important performance measure for DC-DC converters. Its measurement can be extremely difficult when the DC-DC converter is highly efficient and the power loss is extremely low. The input and the output waveforms of a high frequency dc-dc converter may have high frequency components superimposed on the DC components. This further complicates the measurement process as some digital instruments tend to misbehave. Calorimetry method has been previously proposed as an alternative and indirect power loss measurement method. This paper proposes an improved calorimetry method which is capable of resolving the power loss below 2 mW. The method is demonstrated for a single-cell maximum power point tracker with a power rating of 650 mW. The experimental results confirm that the device under test presents a power loss of 24 mW +1.3 mW and the converter achieves an efficiency of 96.2% + 0.2%.