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Hysteresis current sensing solution

Pragash A
Prodigy 140 points

Other Parts Discussed in Thread: INA301, INA240, TIDA-00909, TIDA-00913

Hi, 

I am looking for hysteresis current sensing solution for switched reluctance motor. The switching frequency of the phases is 666.67Hz and i need current sensing hysteresis to be performed at within maximum pulse duration of 0.75ms. (50% of the total 1.5ms).

How to choose the refreshing rate for the current sensor? Also my current should be limited to near 1 A and suggest some products that will suit my needs (like resistive current sensing). 

(supply voltage will be 5V for current sensor) Motor side voltage is 48 V , 2 A peak.......

Thank you,

Pragash.A

  • 0
    TI__Guru** 114905 points
    Hi Pragash,

    Your post has been moved to the current sensing forum for better support.
  • 0 in reply to Rick Duncan
    TI__Genius 14825 points

    Pragash,


    Would this be a high-side, low-side, or in-line current sensing configuration?  For inline, our best offering is the INA240.  Without knowing more about your system, I would likely suggest that for high-side too.  For low side, you could try the INA301.

  • 0 in reply to Jason Bridgmon
    Prodigy 140 points

    Actually it is for switched reluctance motor asymmetric half bridge. The configuration is inline current sensing.... Also current range will be less than 2 A. Is it possible to make hysteresis current control with INA 240, I m concerned about the output refresh rate...... Micro controller I use is clocked at 48Mhz .

  • 0 in reply to Pragash A
    TI__Genius 14825 points
    First, I'll recommend looking at TI designs TIDA-00909 and TIDA-00913, regarding motor control with in-line sensing using the INA240. Have you looked at this already? It uses a C2000 microprocessor launchpad and our INA240 to create control circuitry that might be right up your alley. Let us know if that doesn't apply to your circuit or if there is more information you're missing and we'll be happy to help.
  • 0 in reply to Jason Bridgmon
    Prodigy 140 points

    Hi, 

    Thanks for the reply. I am checking the documents right now. It will be suitable for us. Also is there an alternative with cost effectiveness? We will be needing 3 sensors per board and the end industry is textiles for which the it should be suitable...

    Thank you,

    Pragash.A