mneary said:
Thanks for revealing more, and correcting some of your requirements. The servos must be the self-contained high power hobby servos?
So you need 6.0 and/or 7.2 at 120 amps? each?
Do the 6.0 and 7.2 need to be separate, or is it 6.0<V<7.2?
Apparently 5.0 is low current (<2A?) or do you need 120A at 5V also?
12.0 is possibly very high current, but since it's undefined, can you make motor drivers that tolerate the full range of your supply? (14-24).
Why would you even think of operating a servo (or 24 of them) at stall? How long before the smoke starts to pour out?
Yes, the 5.0VDC is relatively low current (PIC's, etc), 2 Amps would probably be enough. I will only ever have a total of 24-32 servo's powered off of one board at a time, regardless of whether they are connected to 6.0VDC or 7.2VDC, or a little bit of both - so the total amperage draw from the servo's won't exceed 120A. For the 12.0VDC motors I'm really not concerned with that at the moment, and after thinking about it - those really don't need to be regulated anyways. Originally I wanted a universal power supply, something that I could power PC motherboards all the way down to small electronic circuits, I see now that even if that power supply WAS feasible, it would probably be much too large and cost too much to create one per project.
As far as operating the servo's near stall, as I said - they most likely would never ALL be there simultaneously, and not for long periods of time. Here are some results of tests that have been performed with these hobby servos:
Results near stall:
4.8 Volts - 260 oz/in Torque, 1.3 Amp Draw
6.0 Volts - 336 oz/in Torque, 1.8 Amp Draw
7.2 Volts - 405 oz/in Torque, 2.0 Amp Draw (Getting warm)
8.4 Volts - 495 oz/in Torque, 2.4 Amp Draw (Overheating)
9.6 Volts - 510+ oz/in Torque, 2.7+ Amp Draw (Overheating big time)
12 Volts - 540+ oz/in Torque, 2.8+ Amp Draw (She's toast)
The reason I may place some on the 6.0 VDC, and others on the 7.2VDC is because certain servo's tolerate the 7.2 Volts, and others don't. My guess is that a realistic number of AMPS that will be drawn is somewhere in the 30-40 AMP range. The 5.0VDC should be isolated from the 6.0/7.2VDC so as the servo's turn on/off it doesn't interfere with any micro's running..