849 B
849 B
Avalanche Failure
When max. voltage rating is exceeded and too much power is dissipated --> short circuit failure
dV/dt Failure
High speed failure, not well understood.
Voltage spike on drain --> translated to spike on gate, which destroys mosfet
Happens very fast (ns)
Generated by motor noise --> prevent motor noise!
Excess Power Dissipation
Usually MOSFET heats up, unsolders itself!
Doesn't necessarily fail.
--> heat management
Excess Current
High currents --> high temperatures (Power: IIR*t)
Once again: heat management
Foreign object Damage
Loose parts --> cause shorts or mechanical damage.
Jammed or blocked motor
--> fast acting varistor transient absorber --> dissipates energy
--> react with reducing speed in controller
Rapid deceleration --> energy is gained and must be handled. Push into batteries?