Timeline for Sensing voltage drop across the load in the H bridge
Current License: CC BY-SA 4.0
12 events
| when toggle format | what | by | license | comment | |
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| Sep 16, 2021 at 9:32 | comment | added | Andy aka | @BerkerIşık if we are done with this Q and A session then please accept an answer. | |
| Aug 22, 2021 at 11:03 | history | edited | Andy aka | CC BY-SA 4.0 |
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| Aug 22, 2021 at 10:56 | comment | added | Andy aka | If you need to lower the output of the InAmp to a suitable voltage range (such as 0 to 5 volts) then use a potential divider on the output. | |
| Aug 22, 2021 at 10:20 | comment | added | Andy aka | You can power the InAmp from the same rails as your H-bridge but, you'll need to find an InAmp that works with inputs rail-to-rail. Or you can add two more resistors that move both voltages towards a mid-rail point. The reference input on the InAmp should also be connected to this mid-rail point so that voltages on the InAmp output above that mid-point represent current in one direction whilst voltages below mid-point are currents in the other direction. | |
| Aug 22, 2021 at 10:13 | comment | added | Berker Işık | Voltage levels at the two ends of the wire will be very different(like 11.5V and 0.5V). Would be okey for Ins. Amp. inputs? | |
| Aug 22, 2021 at 10:11 | comment | added | Berker Işık | So, how to downscale high voltage to low like 5V scale? | |
| Aug 22, 2021 at 10:10 | comment | added | Andy aka | @BerkerIşık that depends entirely on what accuracy you need. My answer gave option (a) and option (b). Option (b) now has a diagram. | |
| Aug 22, 2021 at 10:09 | comment | added | Berker Işık | Rds of mosfets very dependent to current flow and temperature, not to easy imagine that are constant. | |
| Aug 22, 2021 at 10:09 | comment | added | Andy aka | @BerkerIşık I can't say whether you need to filter the current going into the SMA but, as per my answer you ought to filter the measurement points for the InAmp. | |
| Aug 22, 2021 at 10:08 | history | edited | Andy aka | CC BY-SA 4.0 |
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| Aug 22, 2021 at 10:07 | comment | added | Berker Işık | I think i need a RC filter to get rid of PWM similar voltage pattern on SMA wire to filter out 20kHz switching effects and to get DC like voltage pattern for reading with an ADC, do you agree with me? | |
| Aug 22, 2021 at 9:55 | history | answered | Andy aka | CC BY-SA 4.0 |