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CURRENT MEASUREMENT- AC

ARAVIND C R
Prodigy 80 points

Other Parts Discussed in Thread: INA229

Hi,

I am looking for a Current Sense Amplifier to measure current through an inductive load. My circuit is as shown in attached figure.
It has two Power Amplifiers with one configured as Inverting Amplifier and other as Non-Inverting Amplifier. Input signal to the power amplifiers will be an AC signal of frequncy 20Hz with amplitude varying up to 15Vpp (Minimum Peak= 0V and Maximum peak =15V)using an amplitude control circuit. Signal will not go below 0V.Output of the power amplifiers are connected across the inductive load. By varying the amplitude of the power amplifier output i have to maintain a constant current of 600mA through the coil. I need to measure current through the coil when i change the amplitude of input signal. By making use of a current sense amplifier (preferably having digital output) how can i measure current through the load.

Current Sense Amp

Can i use INA 260 or INA 229 for the above mentioned application?

  • 0
    TI__Mastermind 29335 points

    Hello,

    Thank you for using the TI forum.

    It looks like the INA229 can work fine for you here, since your frequency is not too fast and you won't go below -0.3V.  One thing to watch out for though is inductive kick back.  It may be good to place some voltage protection circuitry to turn on before -0.3V (such as a Shockley Diode) to be on the safe side.