Did a stupid: regen braking engaged when battery disconnected

[tymotors]

Hello,

I recently have bricked my Sabvoton controller because of my poor design choices. I had the regen engaged when my unlocked battery came loose. This caused some sort of voltage spike and the controller is now E waste. I am wondering if anyone would know if it is possible to fix the controller based on this specific issue or if all of the components would be junked.

Thanks all

 

[dominik h]

If only the Fets are blown, they can be changed easily.

But my two dead sabvotons (SVMC72260 and SVMC72150) have both the same problem, they do not recognize the hall sensors anymore after an overvoltage situation. The overvoltage occured while playing with the flux weakening function under no load conditions.

 

[Adrian_]

Most likely you blew a FET or FETs. The motor was regening and producing voltage which was going into the battery, when the battery disconnected, the controller was stilled powered on by charged capacitors so it kept regening but the voltage had nowhere to go so it started blowing up components, that's probably what happened. If it's just FETs then you could fairly easily replace them if you have an soldering iron and save the controller, it's possible that the voltage spike was high enough which took out other components like voltage regulators which in that case, there will be more components to replace but the controller is still most likely saveable if you know how to probe components to check if they are good and willing to spend an hour or two soldering on new components.

 

[tymotors]

Most likely you blew a FET or FETs. The motor was regening and producing voltage which was going into the battery, when the battery disconnected, the controller was stilled powered on by charged capacitors so it kept regening but the voltage had nowhere to go so it started blowing up components, that's probably what happened. If it's just FETs then you could fairly easily replace them if you have an soldering iron and save the controller, it's possible that the voltage spike was high enough which took out other components like voltage regulators which in that case, there will be more components to replace but the controller is still most likely saveable if you know how to probe components to check if they are good and willing to spend an hour or two soldering on new components.

It won’t even turn on unfortunately, so it’s probably more than just the fets right?

 

[Adrian_]

It won’t even turn on unfortunately, so it’s probably more than just the fets right?

Probably, if it doesn't turn on then probably 3.3v and 5v regulators are blown which are required for the controller to turn on.