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Recent content by HI12345

  1. H

    parameter estimation of capacitor

    Actually the power capacitor is connected to the RC-filter rectifier which means there are two capacitors. Also,if I select ESr as the parameter ,is it possible to do the estimation in Matlab? Thanks!
  2. H

    parameter estimation of capacitor

    HI, I am doing the parameter estimation of the power capacitor. I have used this topology to measure the voltage and current of the cap. https://en.wikipedia.org/wiki/Rectifier#Rectifier_output_smoothing What should I do to estimate parameters for the capacitor ? And what are the parameters for...
  3. H

    [moved] how to measure phase difference in matlab?

    Sorry for giving too little information. I did plot my data in matlab and it looks same as NI showed My phase angle is very very small which is about 0.05 degree However, I have to calculate the phase angle by using an algorithm
  4. H

    [moved] how to measure phase difference in matlab?

    I import the excel file into Matlab. However, the phase angle is too small and it shows zero degree.
  5. H

    [moved] how to measure phase difference in matlab?

    Hi all I just got the graphs of current and voltage from the NI device. I want to measure the phase difference between them. And, I have a program to measure the phase difference, but I don't know how to import my graphs into the program. Thanks
  6. H

    [SOLVED] how to calculate the ESR of the AC capacitor

    I measured the voltage and current waveforms of the capacitor under 80V ac 50Hz Can I calculate ESR and actual capacitance directly ?

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