### Paulo Facó (@TheCyrus)

Working with embedded systems since 2010. BSc. Computer Engineering (2012) MSc. Teleinformatics Engineering (2016)

## Re: 90 Degrees Shift of Digital Signal

Hello @dsprookie! Great post!You are completely right about the calculations for three-phase meters. Indeed I'm still using my original approach, this is, a second-order...

## Re: 90 Degrees Shift of Digital Signal

Honestly, I'm not sure. I believe it should be steady. On the input it will be connected to the real power-line, I mean from the electric utility. The output can...

## Re: 90 Degrees Shift of Digital Signal

When I say all frequencies I mean my range requirement as stated in the original post. This is: 50Hz to 70Hz.I'm looking for 0.5% accuracy of active and reactive...

## Re: 90 Degrees Shift of Digital Signal

Thank you for the links! I'll take a look!!

## Re: 90 Degrees Shift of Digital Signal

Correct me if I'm wrong, but your idea is for me to calculare Vrms, Irms, Active Power (P), Apparent Power (S) and then calculate reactive energy (Q) using the formula...

## Re: 90 Degrees Shift of Digital Signal

If I understand correcly you mean from the middle of the HT computation I'll need to extract what would be my non-delayed voltage signal. And that to have the current...

## Re: 90 Degrees Shift of Digital Signal

You mean the HT is the best tool for the job, but probably it will be too much for my 16 bit microcontroller? I'm running at 12Mhz and need to do metering in 3 phases.Anyway...

## Re: 90 Degrees Shift of Digital Signal

I may be missing something here, but I believe delaying the current would be the same problem as delaying the voltage, no? Both can vary in frequency. I have choosen...

## Re: 90 Degrees Shift of Digital Signal

Your analysis is completely correct. That's exactly what I did: designed a simple analog low-pass filter and then used its digital counter-part. I cascaded two stages...

## Re: 90 Degrees Shift of Digital Signal

I'll take a look in this approach. Do you think this is feasible to use in a small microcontroller?

## Re: 90 Degrees Shift of Digital Signal

You mean you have succesfully used HT to calculate reactive energy? May I ask you what kind of microcontroller you have used?

## Re: 90 Degrees Shift of Digital Signal

Thank you @stephaneb. I didn't about the TEX support here.

## 90 Degrees Shift of Digital Signal

Hello Guys, this is my first post here. I tried searching around the web and on the forum but I couldn't find a definite answer to my problem.I'm designing an electricity...

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