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Isolated high voltage side measurement

Discussion in 'General Electronics Discussion' started by fernandomierhicks, Apr 1, 2013.

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  1. fernandomierhicks

    fernandomierhicks

    4
    0
    Mar 5, 2012
    Hi:

    I am testing a circuit that measures the voltage generated by a high voltage converter.

    An off the shelf converter (EMCO) generates 1500 volts that are delivered to a load. A voltage divider divides this voltage by 10,000 and an isolation amplifier (AMC1100) is used to transfer the value to a microprocessor on the low side. A isolated dc-dc converter (ADUM6401) is used to power the amplifier on the isolated side.

    Schematic


    The circuit functions very well until a short on the load happens on the high voltage side. When this happens the Dc-Dc Converter/ isolation amplifier start consuming much more current, after several shorts on the high voltage load these devices stop working altogether.

    My power supply system has to be robust enough to handle shorts on the high voltage load.

    When a short happens on the load, could there be voltage spikes induced on my dc-dc converter or amplifier and killing them? I have tryed putting voltage suppressor (suppressing 10 volts) both on the input and power supply pins of my amplifier with no good results.

    Again the circuit works fine as long as no short happen on the load.

    Thanks.

    Fernando
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,448
    2,809
    Jan 21, 2010
    One option is to limit the current available on your 5V rail to the inverter. This will limit the input power and hence the output current. It may be sufficient to save the inverter.
     
  3. woodchips

    woodchips

    43
    0
    Feb 8, 2013
    Or even a fold back current limiter? Bob
     
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