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AMC1302: Ripple in the output

Shaozhe Wang
Prodigy 20 points
Part Number: AMC1302
Other Parts Discussed in Thread: AMC1350, AMC1311

Hi,

I am trying to use AMC1302 to measure the voltage. The schematic is shown here. VDD1 and GND1 are connected with a 5V voltage supply. VINP and VINN are connected with the power link to measure a single phase AC voltage. Vcu and Vcl will give me the measurement.

But the measurement has a lot of ripple. (Channel-3 and Channel-4).

The Zoom in of the ripple is shown here.

I am wondering why this happened, and how could I fixed it? Thank you very much for your help.

Best regards,

Shaozhe Wang

  • 0
    Prodigy 20 points

    I also got another question. Can I use AMC1302 to measure a DC voltage?

  • 0 in reply to Shaozhe Wang
    TI__Expert 4905 points

    Hi Shaozhe,

    I would first recommend connecting your negative input, VIN, to GND1 to establish the common-mode input voltage. Also, what is your ground source for GND1? What does VOUT- from your voltage supply look like? I am wondering if this is the same ground used for GND2 or if there is any signal on it. It is important to use separate grounds for this device. 

    The AMC1302 could be used for voltage sensing, but I might recommend a current sensing device based on what specifications you're looking for. Please let me know if you have more questions and if this corrects the distortion you are seeing. 

    Best regards,

    Eva

  • 0 in reply to Eva Mason
    Prodigy 20 points

    Hi Eva,

    Thank you very much for your help. I still have 3 questions.

    1. GND1, GND2, and VINN are 3 different sources. They are isolated. The voltage supply is a 208V 600Hz  AC voltage supply, can I directely connect it to GND1? Will this high voltage damage the AMC1302 device?

    2. Can I use AMC1302 to measure a DC voltage?

    3. Basically, I want to measure the voltage of a 208V AC, 600Hz voltage source. Could you please provide some advice about what TI device I should choose to realize voltage measurement?

    Thank you very much for your help.

    Best regards,

    Shaozhe Wang

  • 0 in reply to Shaozhe Wang
    TI__Expert 4905 points

    Hi Shaozhe,

    1. Where are you connecting this voltage supply to? Staying within the absolute maximum ratings will prevent damage to the device.

    2. Yes.

    3. For voltage sensing you could look into the AMC1311 or AMC1350. With a high voltage you'll have to use a voltage divider. To consider more specifications though, I would recommend using our comparison page to look through our products.

    Best regards,

    Eva