Hey all,
I'm working on a project that needs to be plugged into the wall, and I'm using a 12V brushed motor. I've been trying to figure out how to deal with the problem of regeneration - the motor drivers I'm looking into all have braking capabilities, and I want to be able to utilize that. However, the braking introduces the problem of regeneration, which a switch mode power supply does not like.
From what I've read it might not be a problem - the drivers are 28V max, and I'm only driving at 12V, so the voltage increase across the PSU rail might not be enough to hurt the driver. But I'm not confident about that, and I don't want to kill a 50 dollar driver to find out.
I've read that maybe placing a battery pack in parallel with the power supply could do the trick?
Or you could fit a normally-forward-biased blocking diode in the output of the PSU, Apart from losing around 0.7 volts, when regen occurs the diode will be reverse biased
Or you could fit a normally-forward-biased blocking diode in the output of the PSU, Apart from losing around 0.7 volts, when regen occurs the diode will be reverse biased
You don't get any significant braking with a diode, in fact you might get really high voltages as
the H-bridge acts in reverse as a boost converter - the energy has to go somewhere.
The standard motor controller method is to have a dump resistor across the DC rail with a chopper
circuit to dump current into it as the voltage rail rises above a threshold...