Current readout circuit problem!

[JackyCheung]

Posted on August 17, 2014 at 10:32

Gigi or Dino:

       I met a strange question, motor parameter in STM3210E+ MB495 successfully entered the closed loop control. Now I redesign custom board,

      The open loop mode debugging hardware correctly, when the switch into the normal mode, the motor open-loop liters of normal speed, but has the obvious noise, finally can not enter the closed loop mode, display the start-up Error.

     The design of current sampling circuit, whether a rule? I oscilloscope display, amplifying the input 410mv 590mv circuit output amplification ratio 1.46, excuse me whether my T-noise with T-rise did not cause a good?

[JackyCheung]

Posted on August 18, 2014 at 22:47

Gigi:

       I found the problem in using the oscilloscope, I measured the amplifier input, and output magnification is 1.57, but I fill in 1.57 but can not enter the colse_loop, the magnification change 3.0 can successfully enter the colse_loop, excuse me, what is wrong, this situation may arise.