TLV2316-Q1: measuring current ripple of a dc motor

Hi Giada,

high side or low side measurement? SIngle supply or dual supply? Simple non-inverting, pseudo-differential or true differential amplifier with or wihtout pseudo ground?

Do you have a schematic?

Kai

Hi, thank you for your replay!

I'd like to perform high side measurement. Motor will be powered @ 9V.

I haven't created a scheme yet but I was thinking of following that described in this work https://webthesis.biblio.polito.it/14449/1/tesi.pdf.

My goal is not exactly the one described in this thesis but very similar. I would just like to measure the AC component of the DC motor current (current ripple) and calculate its RMS value.

Thanks 

Giada

Hi Jerry, 

many thaks for these info. 

if I wanted to adopt another method (low-side), using INA180 amplifier, how big should the resistance (Rsense) be for an input current ranging from 7 to 11 amperes?

consider that I would like to use the amplifier with 200v / v gain.

sorry if I ask such a trivial question but I would not have any problems with errors since I have read that INA180 features a max offset of 0.150mV.

thanks

Giada

Hi Kai,

thank you for this suggestion!

Giada