thermal shutdown on Infineon controller

[A Monell]

I had my bike with a Lyen 9 fet Infineon die on me this weekend and I immediately checked for wires that might have come loose. the controller is in the side pouch of the battery bag that came with my 800 watt 36 volt motor kit and was quite warm (running on 6s lipo). By the time I had tried all the connectors and disconnected the regen in case a brake was shorted the bike came back to life.
Do the Infineon controllers have a thermal shutdown?
I can and most likely will add some ventilation to the controller but if they do not have that function then I am at a loss as to what happened. I was 10 miles from home and dreaded pedaling with the drag of the DD motor all that way!
Thanks Alex Monell

 

[izeman]

thermal shutdown? no. not they way you would like to have it. if they are to hot they just burn through. that's it. i would never install a controller covered. they need airflow. if you have a ca-v3 you could use it's thermistor input and have that wired to a thermistor installed inside the controller next to a mosfet and check temp at the ca. and have it roll down power as temp exceeds a set level.

 

[Ykick]

izeman = correct.

I recently tried a 6 FET delivering merely 15A inside a battery bag and it got too warm in little time. Woulda cut way down on the wiring in/out of the bag but just not a wise location.

They need air flow and must be able to drain if wet. Many of us prefer under our ass/seat post mounting.

 

[Drunkskunk]

+2. There isn't a thermal protection circuit in the controller.

Controllers need air. the grooved exterior is there for a reason. Those are heat fins. They need access to flowing air or they likely will overheat at some point. The case is metal because it is capable of reaching high temps in normal operation. 200F degrees is not unreasonable.

Its not likely to start a fire in your bag. The internal components will cook to death before it reaches those temps. But if it shorts out when it bakes to death, anything could happen. Get it some air.

 

[gwhy!1]

on the older controllers i.e eb2xx's they had a 5v voltage reg that could shut down if the reg became to hot but I don't know if this applies to the controllers with a 5v switcher.. as has already been said they need air flow or they will cook themself . Your original fault maybe a bad connection in a plug or a temperature dependent dry joint.

 

[amberwolf]

Ditto on airflow being good, but under some circumstances you might not have to worry about it. Since yours is probably overheating then probably you do need to.

HOWEVER: it might be a hall in your motor rather than the controller that overheated and kept it from working. I've had that in one of my geared Fusin hubmotors. It recovered fine after it cooled down enough.