Electronic – High voltage (500V) measurement by scaling down voltage

high voltagevoltage measurement

We are looking to develop a precharge circuit in which we require to measure voltage for which we are scaling 0-500V to 0-5/10V. In this paricular component we get an output which can be given to an ADC. There was a particular component which I found V500-ISO which scaled voltage from 0-500V to 0-5V but the issue with the component was it wasn"t available and was very expensive. So I looked for similar components one of them being ISO224 by texas instruments. In a particular application the output of ISO224 was fed into a precision amplifier. So the couple of questions which rose were is the voltage the same as input voltage ie 0-12V which is the voltage across the R2 resistor in the above diagram or does it correspond to the voltage on the output side which can be -0.3 to 6.8V and the other question is as all the parameters are given for AC voltage can this component be used for DC application. The details regarding all the specifications are listed in the pitcures and datasheets attached below.enter image description here
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Best Answer

This is what a DC measurement would look like:

iso1

And here is the AC measurement. In both cases, 2.5V can be made from 500V with a 5V secondary power supply. The primary power supply is 12V.iso2

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