Detect 5v signal in same pin where it is detecting AC

Other Hardware General Electronics
21

My mind popped into the idea as well.
I had a brief look at possible solutions.

One might be to copy Wolfspeed’s 7.5 kW FM3 Three-Phase Motor Drive reference design.

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Looking at stock for AMC1303 it seems like a bad choice.
So searching for an option at TI:
Isolated ADCs | TI.com

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One would have to make list and find the best combination of stock and functionality. And find isolated power for the high voltage side where the sensing happens. Chipanalog CA-IS3105W and others from that series would be my goto option for that.

22

My first thought was to run the 220V/5V into a high-resistance coil and use an analog Hall-Effect sensor to read the magnetic field and provide isolation at the same time. Then I facepalmed and remembered that he already had an opto in the circuit. So I figured there had to be a way to read the photodiode output as an analog signal.

I know it can work, I'm just not willing to put in the effort for free :frowning:

23

Well there you go :slight_smile:

(Glad to be of assistance)