+Aaron Hammett Thanks Aaron. I see if I can put some magnetic material for you and add it to the forward PS video series. I have had the same request from other people as well. Best regards. You can always email me at rbola35618@aol.com
Hello Robert, Merry Christmas and Happy New Year. The first figure shows 100 mA across 50 ohms. The result is 0,.1 x 50 = 5V The figure show 1.5V not sure why.
A very nice back to basics video. Question: I have always been uncomfortable with the fact that the voltage error output is used as a threshold for comparison with the current ramp to generate the output PWM. How can we mix the two feedbacks just like that - is there a physical significance to it or is this some control theory voodoo? Thanks for all your efforts.
+Anand Paralkar Good Morning Anand. I seen this mixing of feedback signals before. In my TV-VCR fixing days, the capstan speed control was based on two different signals being used and then added together to control the speed of the cassette tape as well as the video heads. The reason they did this is that one signal is used to do the coarse adjustment while the second feedback was used to do the fine or the phase adjustment. So it has been done before. On a side note. I designed on the IBEX stepper supply a feedback system of two where I controls two high voltage diodes and used one feedback loop as the master control and used the second loop as a slave control loop. I would say multiple loop control is not out of the ordinary. Hope the helps. Happy new years to you and you family! Your friend, Robert
+Robert Bolanos True, infact, I would say that multiple loop control is the logical next step to single loop control. However, what I do not get is how do insert a voltage value (error output of voltage loop) as a reference value in the current loop. I mean can we mix voltage and current values like that? What does it physically mean to say that "let the current ramp up to this particular voltage value"? I would rather compare voltage with voltage reference and current with current reference. I hope have been to explain my confusion, or for all you know, I must be stuck-up with something silly. Cheers,
Thank you for your videos. They are very useful for me, I really appreciate it . Greetings from Spain.
You are welcome!
I love all the videos you have prepared so far... really appreciate it... If you have time please make more videos.
Very good breakdown of what's happening inside the two feedback systems.
+Aaron Hammett Thanks Aaron. I see if I can put some magnetic material for you and add it to the forward PS video series. I have had the same request from other people as well. Best regards. You can always email me at rbola35618@aol.com
Hello Robert,
Merry Christmas and Happy New Year.
The first figure shows 100 mA across 50 ohms. The result is 0,.1 x 50 = 5V
The figure show 1.5V not sure why.
+pepperjack8 Thank you pepperjack8! Great catch! Made the annotations. Robert
A very nice back to basics video.
Question: I have always been uncomfortable with the fact that the voltage error output is used as a threshold for comparison with the current ramp to generate the output PWM. How can we mix the two feedbacks just like that - is there a physical significance to it or is this some control theory voodoo?
Thanks for all your efforts.
+Anand Paralkar Good Morning Anand. I seen this mixing of feedback signals before. In my TV-VCR fixing days, the capstan speed control was based on two different signals being used and then added together to control the speed of the cassette tape as well as the video heads. The reason they did this is that one signal is used to do the coarse adjustment while the second feedback was used to do the fine or the phase adjustment. So it has been done before. On a side note. I designed on the IBEX stepper supply a feedback system of two where I controls two high voltage diodes and used one feedback loop as the master control and used the second loop as a slave control loop. I would say multiple loop control is not out of the ordinary. Hope the helps. Happy new years to you and you family! Your friend, Robert
+Robert Bolanos True, infact, I would say that multiple loop control is the logical next step to single loop control. However, what I do not get is how do insert a voltage value (error output of voltage loop) as a reference value in the current loop. I mean can we mix voltage and current values like that? What does it physically mean to say that "let the current ramp up to this particular voltage value"? I would rather compare voltage with voltage reference and current with current reference.
I hope have been to explain my confusion, or for all you know, I must be stuck-up with something silly.
Cheers,