Elm Dc Servo Controller???

[5632alex]

Hello Mike,

The parameter you provide it cannot work for my motor, After i have issue a + or - value the motor turn few round and stop, servo error Led on. how you calculate the parameter?

[5632alex]

Hello Alex751,

Did you manage to tune the parameter?

[aspenelm]

Sorry to intrude, I am interested in this topic. I am wondering why everyone is making their own changes to the elm circuit. Is there something inherently wrong with the original high power design, or is everyone just wanting to make improvements?

[gsmgsm]

So fist tell me what kind of programmer you have? I mead AVRISP STK200/300 STK500 ??

Regards.

Hi Alex
http://www.robokits.org/products/?p=...ort-Programmer

The above link is the programmer that i have. And AVR Studio 4. Now plz tell me wht do I need to do next. looking forward....

Regards
GSMGSM

[smarbaga]

vernomx999
if you are talking about the diagram and layout i posted,
i have not tested this cct. yet as i have none of these fet drivers, yet.
it seems like an east layout to place on a point to point perf board for
proof of consept,
i can repost the layout without the component placements, if anyone wishes to mill or etch a board,
also i would make the current carring traces bigger.

[NASR1]

Hello Nasr1!

What kind of software you have used to trace your layouts??

Regards
Alex.

HI
I working whet protel 2.7 pcb.

Regards.

[smarbaga]

i have layed out a fet driver section with current monitoring.
this design is untested as said before but it should work.
it superseeds the posting #117 as the current monitor is a high side monitor and i put it on the low side in post #117.
any comments or sugestions is greatly appreciated.
see attached.

[max_imum2000]

SMARBAGA
thanks for the layout smarbaga
but thats the fets section only , anyway no problem in adding the rest .

NASR1
i noticed that you places 90S2313 atmel chip
anyone know if that chip can be used insted of the attiny or they are the same chip.
i am a pic kind of guys

thanks all

[gsmgsm]

Hi All,
Im totaly new to assembly and can't understand it really. Can anyone plz help me know or tell me in ENGLISH That What is the programing file SM3A Is doing in the attiny2313 ? I mean, What is its real meaning and function in gernal language.. It'l be of great help. looking forward....

Regards
GSMGSM

[kreutz]

i have layed out a fet driver section with current monitoring.
this design is untested as said before but it should work.
it superseeds the posting #117 as the current monitor is a high side monitor and i put it on the low side in post #117.
any comments or sugestions is greatly appreciated.
see attached.

Hello;

I downloaded the datasheet for your Mosfet driver chip. The Rhigh and Rlow are very small so you will have to add a resistor in series with the gates in order to limit dV/dt to less than 5V/nS. Also, there is no deadtime added on the Mosfet driver chip, you will probably have to include two resistors and one ultrafast diode in the gate drive in order to make sure Toff is smaller than Ton (or to control them independently),then make sure that your firmware will introduce a dead-time anyways.

[smarbaga]

thanks kreutz ,
i don't know what type of fets will be used but a resistor and diode layout can be provided and values added depending on the fet delays.
would not firmware delays suffice in this situation?

[kreutz]

thanks kreutz ,
i don't lmow what type of fets will be used but a resistor and diode layout can be provided abd values added depending on the fet delays.
would not firmware delays suffice in this situation?

Depending on the turn off and turn on times you get. If you make turn off time smaller than turn on time you might not need the dead-time; In that case, in order to keep losses low, you will have a high dV/dt at turn off, and that will complicate things.

Delays like propagation delays will do nothing unless you insert extra delays in the turn on and off part of the switching sequence, in order to make sure the Mosfet is off before turning on the other mosfet in the same branch of the bridge. You can make it easier by choosing a half bridge driver with either fixed or adjustable dead-time, although you will probably need the diode and two resistors in the gate drive circuit in order to control ton and toff independently..