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Member's Forum Suggestions for a circuit/off the shelf component/device that can amplify an ac signal from 12V @ 5ma to 300V @ .25 A
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Suggestions for a circuit/off the shelf component/device that can amplify an ac signal from 12V @ 5ma to 300V @ .25 A

dafapa
dafapa over 1 year ago

I'm mostly an embedded software person (lately more pure software).  I'm getting the details of the requirements from a person that works as a protection engineer.  After getting some feedback I'm going to try to provide some more information and re-phrase the question.  

The ultimate goal is to convert a signal from a signal generator so that the voltage levels are high enough to work with the SEL 351S relay (without having to remove parts and wire things directly to the low voltage side internally).  As some people suspected its intended to be part of a test bench for simulating fault conditions.  The signal generator will be outputting something like the image below, with a maximum output range of +/-12V.  As you can see the signal contains a DC offset during the fault condition.

image

Being a utility application the base frequency is 60Hz, but harmonics up to 1200Hz have to be considered.  The goal is to scale the signal from +/- 12V to +/- 424V (I realize before I said 300V, but am now told its 300 * sqrt(2)).  The scaled signal will be connected to an input impedance of 1 Mega Ohm on an SEL 351S relay.  Someone pointed out the large disparity in input and output power (I was just being thrown numbers when I made the post).  After examining things it shouldn't need anywhere near a quarter amp - it should be at most about .5ma max.  Its not really driving a load; this is an input to a voltage sensor on the relay.  

I hope this clarifies things.

I'm updating this to include that 10 channels are also required.

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  • baldengineer
    baldengineer over 1 year ago +3
    This feels like an XYproblem in the making. What end task are you trying to accomplish.
  • rsc
    rsc over 1 year ago +2
    What frequency AC input do you need to amplify?
  • shabaz
    shabaz over 1 year ago in reply to dafapa +2
    What's the actual goal you're trying to achieve (i.e. if you could start at the beginning, before getting to your immediate objective). Just trying to guess, it sounds like some sort of industrial power…
  • rsc
    0 rsc over 1 year ago

    What frequency AC input do you need to amplify?

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  • anniel747
    0 anniel747 over 1 year ago in reply to rsc

    Frequency and bandwidth or waveform.

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  • baldengineer
    0 baldengineer over 1 year ago

    This feels like an XYproblem in the making. What end task are you trying to accomplish. 

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  • dafapa
    0 dafapa over 1 year ago in reply to rsc

    60 hz.  

    I did a little more investigation. It looks like I need to be able to handle harmonics up to 1200 hz probably.

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  • anniel747
    0 anniel747 over 1 year ago in reply to dafapa

    Load impedance?

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  • dafapa
    0 dafapa over 1 year ago in reply to anniel747

    1 Mega Ohm.  Its going into a SEL 351S relay.

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  • dafapa
    0 dafapa over 1 year ago in reply to baldengineer

    Its for signal conditioning for a relay (utility power application).  The output of a potential transformer (12V input) goes into the amplifier which outputs 300V.  This is fed into a SEL: 351S relay.

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  • dang74
    0 dang74 over 1 year ago

    Maybe a TRIAC.

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  • shabaz
    0 shabaz over 1 year ago in reply to dafapa

    What's the actual goal you're trying to achieve (i.e. if you could start at the beginning, before getting to your immediate objective).

    Just trying to guess, it sounds like some sort of industrial power system testbed to simulate faults or something, that you're trying to achieve?

    I doubt you're going to find anything off-the-shelf unless it's a well-known problem you're trying to solve perhaps. However I'm sure you could get an engineer to put together something custom, if you were able to explain it a lot better.

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  • ggabe
    0 ggabe over 1 year ago

    What pushes the hardware oriented engineers button is the word “amplifier”. For them it means a linear device, which is not a power AC/AC converter neither a switching on/off kind of device.

    Can you please clarity your expectation of the amplifier function? And the overarching goal.

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