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| INA193 High side current sensing, ground problem? |
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--- Quote from: namster on August 15, 2019, 10:01:36 pm ---this kind of IC have to be connected with one ground for correct operation (supply and Vin ) , i think that you have to review your design. the tooridal transformer isn't a good idea , in a DC voltage the transformer will be saturated . --- End quote --- why would be a toroidal transformer be bad ?..i added 4 isolated secondaries and i plan to use this one as VDD for the ina193 op amp and adc i wanted to add more input frotection for the adc and for the VCC input so i added a fuse and a MOV for the adc input i added 2 schottky diodes for clamping after the ina 193 buffer for the resistor divider ...RC filter and schottky clamping, is this enough? should i add someting else? should the ina193 output be buffered by another opamp? i dont think so, let me know what you think |
| namster:
RC filter have to be calculated according to your sampling Frequancy , for schottky clamping it can be replaced by a zener diode of 5V to protect the input of Arduino I thought I understood that you will connecte the primary of transformateur in output of Opamp for isolating the output , that's why i said that will not work because it will be saturated in DC mode , for now I have not yet understood how you will use the transformer ? , maybe for the linear power Supply ? to continue the discution please clarify with a schematics . :popcorn: |
| Atom:
--- Quote from: namster on August 16, 2019, 07:30:04 pm --- maybe for the linear power Supply ? to continue the discution please clarify with a schematics . :popcorn: --- End quote --- yes the transformer will be used for the linear psu before the bridge rectifier, there are other "safety" measures that i can adopt? |
| namster:
Ah ! , the toroidal transformer is a good choice , it have a better efficiency than a classic transformer ! , you can also add a EMI filter fuse and varistor , a Series Regulator Diode between Vin and Vout of your regulator , to protect it against reverse voltage https://www.digikey.com/Web%20Export/Supplier%20Content/Lambda_285/PDF/TDKLambda_all_about_emi_epmag.pdf http://literature.cdn.keysight.com/litweb/pdf/5952-4020.pdf (39) |
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