A deeper insight into Differential Amplifiers with high common mode voltage

[@Chris_Grossman]

I had never looked at this topology before. Thank you for the excellent presentation.

[@sambenyaakov]

Thanks for comment

[@megfvvd35432]

Excellent video!

[@sambenyaakov]

Thanks

[@eduardinification]

I used T network in a BMS for an UPS Pb battery pack. T network allowed to prevent the battery from discharge through the measurement front end input resistance. Thanks for the video!

[@sambenyaakov]

Thanks for sharing.

[@dhanushavvari3356]

Great!!...Thank you for sharing

[@sambenyaakov]

👍😊

[@ats89117]

Very nice presentation! The advantages and disadvantages of the first two methods were explained in some detail, while the third method was given, but with less information on performance relative to the first two methods. This is left as an exercise for the (lazy) viewer, which is fine.

[@sambenyaakov]

You got it. Home work!

[@justinn771]

Second to none!!

[@sambenyaakov]

Thanks

[@frunsebischkek1050]

If you take the method #3 and turn the star circuit r2, r5, r6 into a triangle circuit, you get the method #2.

[@sambenyaakov]

HI, Frunse Thank you for the enlightenment. Never thought about that.

[@frunsebischkek1050]

@@sambenyaakov Thank you in turn for your precious work here on KZbin. It helps a lot of engineers in getting better. People like you make the world a better place.

[@davidaz4933]

ערוץ מעולה יש לך ידע נרחב

[@sambenyaakov]

👍

[@Antyelektronika]

Hi Prof. Ben-Yaakov. I think that in minute 2:31 in equetion bellow should be (R3+R4) / R3. The missing is "4". If I am wrong please correct me.

[@sambenyaakov]

You are correct. Thanks for spotting the error and commenting.

[@HBD113]

Hi sir, In 1:51 min, you are using the ratio needed for the differential amplifier to work as we need, it seems that the ratio should be R2/R1=R4/R3, please correct me if i'm wrong. Thank you for a great lecture again !

[@sambenyaakov]

Indeed, this slide has a typo. Thanks for bringing this up.

[@NiHaoMike64]

For the battery monitor, wouldn't a microcontroller per cell be cheaper and also handle switching in the balancing circuit?

[@sambenyaakov]

Not really. You need precision voltage measurement and isolated communication between units.

[@cuchulainkailen]

Sam... another nice lecture, expanding on the old, dusty textbook. 😋😋 Now, if you could circle back to the elaplace based ferrite model? I'm not lazy; I just don't have it in LTSpice.... Or, is it possible by using laplace in the LTSpice B model?

[@sambenyaakov]

Yes, you can use Laplace in LTspice B models.

[@JoelLandivar]

Hello, Professor. I am currently designing an inverter application. Is it possible that I could discuss some doubts I have with you?

[@sambenyaakov]

You can write to [e-mail]

[@sam7901]

Sir, why not use an instrumentation amplifier which has inherently good common mode rejection capabilities and is less susceptible to component (resistor) deviations

[@sambenyaakov]

Hi Srinath, Instrumentation amps are basically a differential amp with buffers. They do not have, inherently, high common mode volt capability. The common mode is generally restricted to the power supply range. CMRR does not imply high Vcm withstanding.

[@marcinszajner2924]

Great video!

[@sambenyaakov]

Thanks!