CC BEC ,design flaw.

[Pdelcast]

Originally Posted by BrianG

Did you mean they can all fail closed? I assumed that the FET S-D terminals shorted (or were driven that way). Anyway, fair enough. It just seems that most other BECs fail by simply stopping to operate.

Knowing that, how hard/expensive would it be to incorporate a voltage switch at the output to cut power if it exceeds a certain value? Since the CCBEC is adjustable to 9v, it would have to be above that...

Well, we could use the microprocessor that is on the BEC to determine if the power FET failed, and then use another FET to cut off the output (or use an additional comparator output to drive the FET, and generate the compare voltage with the D/A converter.... etc...)

The issue is that the CCBEC shouldn't be failing -- not with all the over current protections it has. We need to look at the applications to see if we can reproduce the failures in the lab. There shouldn't ever be a failure in a car with only one servo -- people run the CCBEC without any issue on helis and aircraft with 6+ servos.

Patrick

I had a Koolflight BEC fail on me and it took out all my electronics with it. I think it can happen with any BEC.

[GT35R]

Originally Posted by Pdelcast

The issue is that the CCBEC shouldn't be failing -- not with all the over current protections it has. We need to look at the applications to see if we can reproduce the failures in the lab. There shouldn't ever be a failure in a car with only one servo -- people run the CCBEC without any issue on helis and aircraft with 6+ servos.

Patrick

The only reason I got into cars was due to getting bored waiting for the weather to be good for flying. I thought it would be easy (&cheap), I can fly for a year without breaking anything... Not so, the bastards break something every 10min of driving. I guess the electronics don't like being thrown around much either and the conditions I imagine would be hard to replicate in the lab.