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《Journal of Data Acquisition & Processing》 2001-01
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Modeling and Measuring Methods of Switching Characteristics of PTC Elements

Hu Zheng Yi Xiaoshan Institute of Mechatronics & Automation,National University of Defense Technology Changsha 410073,P.R.China  
Thanks to their switching characteristics, PTC elements have been used more and more broadly in over-current protection, electromotor starting, etc.. In order to ensure the quality of those industrial products using PTC elements, it is necessary to test and evaluate the switching characteristics of PTC elements before assembling. In this paper, firstly, through theoretical analysis, the differential equation model of the switching process of PTCs is built, which can simulate the switching behavior effectively and accurately. Then, two parameter measuring methods are developed, one is hardware signal condition method, mainly based on a AC to DC transition circuit; The other is software signal processing method, mainly based on Hilbert transform. Theoretical analysis and experimental results show that both the two methods can measure the switching characteristic parameter effectively, while the latter can achieve higher accuracy than the former one with relatively higher cost.
【CateGory Index】: TP274
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