I have a fancy (around $400) 72V 1500W ebike charger that was connected to a battery in reverse polarity. There were two high specs MOSFETs on large heatsinks that blew up to pieces.
I ordered the MOSFETs from digikey and inspected the few other large components near the outputs and there was still a short.
My suspects were two MOVs that were not short, 680uf/100v 3 parallel caps that measured good (capacitance, leakage, and ESR), and finally a small SMD diode that had a crack and when inspected off the board was shorted.
This diode is connected across the caps (and the output to the battery) in reverse bias. My guess is that it is put there for reverse connection protection but I am not sure. I am trying to make an educated guess to what to replace it with because consulting websites that list SMD components' symbols was not fruitful so far.
I am hoping that someone with more experience and knowledge have come across a similar situation. Any advice is much appreciated
I ordered the MOSFETs from digikey and inspected the few other large components near the outputs and there was still a short.
My suspects were two MOVs that were not short, 680uf/100v 3 parallel caps that measured good (capacitance, leakage, and ESR), and finally a small SMD diode that had a crack and when inspected off the board was shorted.
This diode is connected across the caps (and the output to the battery) in reverse bias. My guess is that it is put there for reverse connection protection but I am not sure. I am trying to make an educated guess to what to replace it with because consulting websites that list SMD components' symbols was not fruitful so far.
I am hoping that someone with more experience and knowledge have come across a similar situation. Any advice is much appreciated
Comment