Switch Mode Power Supply Simulation By Steven M Sandler
Two of the things that have not changed are the desire for better
models and faster simulations. I performed the original simulations on
my “hyperfast” 133-MHz computer! At the time, I thought if I could just
get a faster computer, all of our SPICE problems would be history, right?
Today I am simulating on a computer that has a 2.6-GHz processor with
512 MB of RAM, and I would still say that simulations run too slow.
The computer technology has evolved, but so have the models. In 1996
we were performing simulations on 100-kHz power converters, whereas
today I routinely see 1- and 2-MHz power converters.
Another thing that has not changed is that I still routinely receive
comments such as “We don’t have time to simulate” or “Simulation
results don’t provide accurate answers.”
There have also been many changes since the earlier version of this
book. Design cycle times have been reduced, while performance requirements
have generally become more difficult. The monolithic devices of
today incorporate much more technology with many more functions and
features than the devices of 1996. It is for these reasons that I would
argue that we must use SPICE or some other simulation tool to the
fullest extent possible.
Another change since the predecessor volume was published is that
many component manufacturers have jumped on the SPICE bandwagon.
Many semiconductor manufacturers publish SPICE models of
their devices, as do capacitor manufacturers and inductor manufacturers.
Many integrated circuit manufacturers publish SPICE models and
some even offer Internet-based simulation tools with preset templates
for their devices. Device models have generally improved in accuracy,
but beware: There are still plenty of poor models being published.
In order to keep this book as useful as possible, several changes were
made to the earlier version. I updated some of the example circuits to reflect the higher level of technology and added actual measurement
results for many of the example circuits. This shows the correlation
that is possible and hopefully proves once and for all that SPICE will
provide very accurate results if you start with an accurate model.
The linear regulator chapter has been expanded. As simple and “low
tech” as these devices appear to be, I still see many design issues involving
these devices. Hopefully, this additional information will improve
the understanding of how these devices operate and the issues that
surround them.
A chapter has been added on active power factor correction (PFC),
because it has become a much more widely used technology.
I hope that you will find the updates useful and wish you happy
simulating.
Link download & Reading: free download
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