Today I was making the final config changes to my dual VESC setup and I burned my power supply
Every time the motors brakes, the PSU would go into error mode and I had the power it off/on to reset. This was an annoyance but it was manageable.
I was so stoked to see both motors spinning that I took it to full throttle. When I inched the control back slightly, the PSU started beeping and this time it gave out a little bit of smoke. Now it is in over-current mode without anything connected.
It was only a cheap Chinese power supply (Atten 3005T) and it’s maybe fixable, if some charred component is yelling replace me when I open it up.
Anyway, this is a bummer and should be avoidable with a few diodes and a resistor.
The first diode would obviously prevent the current for going back into the power supply.
The second diode would direct the current into a resistor that can take a few watts of power.
The other end of the resistor is tied to the ground, so that it would simulate regenerative braking.
There’s the double voltage drop of 1.4-2 volts that makes a dead zone, but I don’t think this will cause problems. In practice, the setup would go from being powered by the PSU to an open circuit for a short while, then the simulated regenerative braking would kick in.
Has anyone made something like this or does everyone own a proper lab supply?
If you have, please share if it worked and tell us what component values you chose.
Its probably a smart idea to over-rate the diodes by at least 5x the PSU rating?
The resistor should probably be a 10 ohm power resistor to simulate the battery?
This circuit would also be handy for the people with one-touch startup units that ramp up the current without a spark-eliminator switch. Like my last power supply, these also aren’t compatible with regenerative braking.