Segway Forum banner

1 - 3 of 3 Posts

·
Registered User
Joined
·
2 Posts
Discussion Starter #1 (Edited)
I have a Segway Ninebot ES4 kickscooter and I am having issues with the controller it seems. Essentially at some point the motor ceased and seems to be fused, wont accelerate, wont brake, and even if power is off there is resistance in the motor rotation. I narrowed it down to a blown Mosfet related to one of the motor leads. It beeped with the continuity test so I concluded it was blown. I tried replacing the Mosfet, at first with one that had the same model number as the others and after that blew as well I upgraded to a slightly more powerful Mosfet that blew as well. The Mosfets blow pretty much immediately after trying to ride the scooter. At first when I swap the Mosfet and put everything back together the motor rotates freely, I can accelerate without load and seems to be fixed, but right after trying to ride the scooter, it blows.
This is where I am stuck now, the same Mosfet keeps blowing. What is causing it to blow, Is it the Mosfet driver?
Has anyone here on this forum repaired Ninebot ES4 (or similar) controllers with the same issue? What can I try? I have two boards like this that I would like to learn how to fix this kind of issue with.

Info:
Original Mosfets on the board: NCEP01T13A (Tried replacing with same model from another dead controller)
Secondly tried replacing with: IRF3808 (It was the closest match I could find that was sold in my country)

Edit (added pictures):
89


91


92
 

Attachments

·
Registered User
Joined
·
24 Posts
Welcome @Ced495

Sounds like the common Ninebot over-voltage problem that many have experienced. I'll try to find out more but so far this might help: Parasitic oscillation frequencies are typically in the range of 50MHz to 250MHz. Such an oscillation condition is unacceptable because it can cause over-voltage transients on the gate, radio frequency noise emission, high switching losses, and can even lead to uncontrolled, sustained oscillation and destruction of one or more devices.

I suggest you post the pictures along with any other details for anyone with the answer looking on.
 

·
Registered User
Joined
·
2 Posts
Discussion Starter #3
Sounds like the common Ninebot over-voltage problem that many have experienced. I'll try to find out more but so far this might help: Parasitic oscillation frequencies are typically in the range of 50MHz to 250MHz. Such an oscillation condition is unacceptable because it can cause over-voltage transients on the gate, radio frequency noise emission, high switching losses, and can even lead to uncontrolled, sustained oscillation and destruction of one or more devices.

I suggest you post the pictures along with any other details for anyone with the answer looking on.
Thanks for the reply. I added pictures to the post. I have read about the common issue with the Ninebots. At first it used to be that the traces where too thin on the board but those were thickened with solder. Now it burns MOSFETS constantly? Is there a fix for it, where does the problem originate?
 
1 - 3 of 3 Posts
Top