Hi,
I have previously built systems with drives that operate in 4 quadrant mode, where they dump power into the power supply during braking. This is fine with linear supplies, but i am considering a new build that needs to be portable, and the weight of linear power supply is a problem.
I can see a few problems with using switch mode supplies with my application, and i wanted to get some ideas of ways around them. Firstly i will need to dump power into the power supply, so are there switch mode psu designs that allow this? Alternatively does anyone know if i could somehow add a seperate dump resistor to the design?
Are there going to be problems with the voltage regulation tracking output voltage if i start increasing the output voltage due to back-emf?
My application requires the drives to be operated in torque control mode, and the motors will run with 0 torque for the most part, then switch to full torque instantly. I am concerned that a switch mode power supply would not be capable of providing sufficient instantaneous current, is this likely to be an issue? I assume i can add extra external capacitance to help with this?