Sharing with you some thoughts and findings
Do not throw that jitter into the bin !
On-board
of
railway
type
vehicles,
Electronic
Brake
Controllers
implementing
Wheel
Slide
Protection
need
to
accurately
monitor
the
signals
from
speed
sensors.
On
said
signals,
a
minimal
amount
of
jitter
is
unavoidable,
and
it
will
always
be
present
due
to
manufacturing
tolerances,
and
various
other
sources
of
background
“mechanical
noise”.
In
a
typical
application
said
minimal
jitter
is
usually
contained
within
±
1%.
Conventional
speed
signals
processing
electronics
disregard
this
modulation
as
merely
one
more
source
of
noise, being only interested in the measurement of the frequency of the speed sensor’s output signal.
On
the
contrary,
we
have
developed
a
technique
which
does
not
disregard
this
source
of
noise,
but
it
instead
includes
specific
means
to
accurately
measure
its
value
(with
microseconds
resolution)
and
periodicity
of
occurrence,
with
the
purpose
to
extract
precious
diagnostics
information
about
defects
of
the
wheels, bearings, rail track.
A Conductance Control Primer
Wishing
to
gain
a
better
grasp
of
the
Current
Mode
Control
Technique
(also
called
Conductance
Control,
when
the
external
feedback
is
closed
on
the
output
voltage)
in
a
Switching
Mode
Buck
Converter
Regulator? Here is a first introductory lecture.
Coming soon …
The Parallel Power Regulation Principle
Your
input
power
bus
is
a
regulated
bus,
and
to
achieve
the
required
regulation
at
your
output
you
might
get
away
by
limiting
to
10%
the
amount
of
throttle
on
the
full
transferred
power.
Then
you
think:
well,
I
optimize
the
main
converter
as
an
unregulated
inverter
capable
of
handling
100%
of
the
power,
and
for
that
10%
residual
regulation
a
serially
connected,
lower
power,
converter
would
do
…
and
you
go
on
thinking:
if
regulation
can
be
achieved
handling
just
10%
of
the
transferred
powered
with
90%
efficiency,
then
the
effective
efficiency
of
the
pre-regulator
function
is
99%
…
wait,
you
are
thinking
too
fast.
A
serially
connected
lower
power
regulator
would
still
need
to
handle
the
full
power
through
its
output
rectifiers,
whose forward voltage drop would spoil your best hopes. But here is the trick.
Coming soon …
C-Sigma
C-Sigma s.r.l. 2015
Topic nr. 4
Text goes here ……
Topic nr. 5
Text goes here ……
Topic nr. 6
Text goes here ……
