PWM and dither

[Pasquale]

Epsilon Rho ha scritto:

Pasquale,
stai operando su un circuito di posizione in retroazione negativa?
Gene

Esatto è in retroazione negativa ma non di posizione, di corrente. Devo
controllare la corrente in un solenoide per il movimento di una valvola.

Pasquale.

 

[Epsilon Rho]

OK, let's use English, for this is an English newsgroup.
My point is that from the solenoid viewpoint there is very little difference
between a "high" PMW frequency with a linearly superimposed dither frequency
and a PWM that produces the same frequency spectrum as PWM+dither. If you
place the dither frequency above omega-not, that is above the closed-loop
bandwidth, you are using that frequency for two purposes at the same time,
without the complication of adding an extra dithering frequency.

Gene

 

[Pasquale]

Epsilon Rho ha scritto:

OK, let's use English, for this is an English newsgroup.
My point is that from the solenoid viewpoint there is very little difference
between a "high" PMW frequency with a linearly superimposed dither frequency
and a PWM that produces the same frequency spectrum as PWM+dither. If you
place the dither frequency above omega-not, that is above the closed-loop
bandwidth, you are using that frequency for two purposes at the same time,
without the complication of adding an extra dithering frequency.

Gene

Thank you for your advices. I'll keep in mind developing my project.

Thank you again,
Pasquale.