Overshoot Undershoot Tests at 50 Amps
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Uploaded by MPaulHolmes on Dec 31, 2011
This video shows how to turn on the controller, and the overshoot and undershoot on a real life actual motor.
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Can somebody explain in layman's terms what overshoot/undershoot is and why it's important to know? I do know the basics of how the PWM controller (theoretically) works, but I have very little experience in electronics.
jong036 1 month ago
@jong036 Hello! When the mosfets turn off, the current wants to keep going through the mosfets, since current can't change instantaneously. So, You put in some "freewheel diodes" so that the current can flow through the diodes instead of through the mosfets when the mosfets are off. But even with the diodes there, there's still something called "stray inductance". The current still wants to keep going through the mosfets a bit. So a voltage tries to push through the mosfets even though ...
MPaulHolmes 1 month ago
@jong036 they are off. That causes "overshoot". The voltage that the mosfets see from Drain to Source goes above the battery pack voltage. You don't want that! If the voltage from drain to source of the mosfet should go over the rated voltage of the mosfet, then you are in big trouble, mister!
Undershoot is when the current suddenly is allowed to go through the mosfet from drain to source, it goes and just keeps on going! The voltage at the mosfet's Drain races to zero volts...
MPaulHolmes 1 month ago
@jong036 and keeps on going past zero into negative voltage.
MPaulHolmes 1 month ago