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how to calculate harmonic current of AC input current
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alphi



Joined: 23 Dec 2001
Posts: 440
Helped: 1
Post13 Feb 2004 4:19   

how to calculate harmonic current of AC input current
I want to build a harmonic current meter for power supply testing,I use AD converter to sample AC input current ,but how can i calculate harmonic current ? what is the formulate? how to use FFT?
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flatulent



Joined: 19 Jul 2002
Posts: 4875
Helped: 324
Location: Middle Earth
Post13 Feb 2004 6:00   

Re: how to calculate harmonic current of AC input current
I have seen a hardware version of this with a notch filter at the main frequency and high pass and low pass filters as well. The output was amplified and rectified. The source of the signal was from a clamp on current transformer.

I suspect that you could do the same thing in DSP.
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alphi



Joined: 23 Dec 2001
Posts: 440
Helped: 1
Post14 Feb 2004 8:57   

Re: how to calculate harmonic current of AC input current
Thank you!
But I need to known how to calculate harmonic current from sampled data.
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Post14 Feb 2004 8:57   

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H_u_n_t_e_r



Joined: 24 Nov 2001
Posts: 207
Helped: 4
Post14 Feb 2004 11:03   
You can use switch capasitor filter and scan your frequency band..maxim has that chips(max 8 order) but these chips has 20Khz BW.
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