MOSFET Switching Experiments
Low voltage power
mosfets offer an excellent set of operational parameters which make them suitable
for low power coilguns. Ease of use arises from a voltage control characteristic
which means that, in many cases, the device can be driven directly from simple
triggering circuit. In fact, many mosfets are now manufactured specifically for
use with TTL (5V) level gate drive.
It is also possible
to get devices with extremely low on resistance - of the order of 10m.
Mosets can also withstand peak pulsed currents several times their continuous
rating. If a larger current capacity is needed then mosfets can easily be paralleled
since they have a positive resistance temperature coefficient.
Fig 1 illustrates
the three measurements which are made in this investigation.
1. Basic measurements during mosfet operation.