RE: SSTC questions

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mccauley, Daniel H by way of Terry Fritz <teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>

 >1) Why do people "disable" the body diodes of the FETs?  With a full
bridge,
 >there shouldn't be a problem with too much current through the diodes, next
 >to none if the switching of the FETs is done correctly and there is at
least
 >one rectifying diode on the input.

FETs have a natural diode in them due to the way they are made.  However,
this diode structure is not designed to be used for anything.  It is
uneven, has hot spots, high resistance...  It is just not to be used.

 >>>>>>Actually that is an incorrect statement.  This internal diode is
crucial to many types of applications and
designs.  However, for SSTC work, its just not good enough.

The Captain