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I am designing an over 1 mA current detector circuit using IN193 with a supply voltage of 5000 Vrms to the test sample IC at 150°C temperature as shown in the attached figure.

I expect that circuit is not so good and accurate. Can anybody help/ guide me to design a circuit which indicates over 1mA current for the above-given conditions and shown test setup?

C

JRE
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Lucky
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    You are generally better off measuring current in the Ground side of your circuit if you can. – elchambro Jul 10 '20 at 02:33
  • Welcome. How do you plan to generate 5 KV without hurting yourself? –  Jul 10 '20 at 03:17
  • @ Sparky256 we have test high voltage source so that's not an issue. The issue is to design a current indicating circuit – Lucky Jul 10 '20 at 03:32
  • @ elchambro any idea or circuit ? or weblink which could help me? – Lucky Jul 10 '20 at 03:36
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    _"I guess that circuit is not so good and accurate."_ - it's not even a circuit. How accurate does it need to be, and what sort of indication do you need? – Bruce Abbott Jul 10 '20 at 04:01
  • I just need help of how I can design 1mA over current alarming circuit. If someone have some web-link or suggestion that would be really approciated. Thanks – Lucky Jul 10 '20 at 07:54
  • Can you crop your image? 90% of it is white space. Your test circuit doesn't have to be in the 150°C area so that is not relevant to your question. – Transistor Jul 10 '20 at 09:18

1 Answers1

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The problem you have is to limit over-current for the circuit operating at 150 degrees C oven and the applied voltage can go as far as 5000Vrms. Since you have asked only for indication, not tripping, I will provide you the explanation for indication only.

According to these specifications, when working at these, high voltage, it is usually advised to use a hall-effect current sensor to detect current (safety purposes, and instrument safety.) Hall sensors are available to detect within a specified range (although 1mA range is very low.)

5000V is too high for a current sensor to be connected in series connection.

JRE
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DivB
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  • Actually I never used a hall sensor before. Could you give me an example that can help me to use it with my stated objective?. In addition, which hall effect sensor I can use for the given specs? what will you suggest if I also want to trip my circuit? – Lucky Jul 13 '20 at 02:26