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Design-in Guide - Philips Xitanium LED Xtreme driver
Dynadimmer attention points
If after synchronization the change in power-on time is more
than one hour then the driver does not need three new
power-on
cycles
for
re-synchronization.
looks further
back
in
cycles to calculate the virtual clock time. As long as there
are three stable power-on cycles in the history of the last
five
power-on
cycles, with all three three having the same
duration (i.e. less than one hour difference) the driver will
still dim as scheduled. This mechanism will prevent disruption of
the
Dynadimmer
dimming behavior due to occasional mains
black- and brownouts.
If
the
difference
in
power-on
one hour
then
this
will
which the driver
will
average
times as reference to calculate the virtual clock time. The dimming
schedule will
stay
active
new power-on time. Below examples show the sequence of
events as the on-time changes.
Influence of mains interruption (blackout):
If
the
mains
voltage
one second then the driver will record this as a power-off
event and will try to re-calculate the virtual clock time again
when power
is
restored.
driver
will need
to
synchronize
time duration (see
previous
mains
voltage drop to 0V is less than one second then
the
Dynadimmer
operation
Dynadimmer dimming cycle remains unaffected.
Influence of mains voltage dip (brownout):
The
driver
is
robust
enough
dip down to 25VAC for one minute without disruption of
the Dynadimmer timing. Light output will be less and may even
drop to zero for the duration of the mains dip but the dimming
schedule will not be affected.
Temporary mains power-off (maintenance at night, blackout):
If the power outage occurs within the first 4 hours of the
night then
a
new
night
remaining
on-time. For the next night, the average on-time
before the outage will be used as reference. Hence, it won't
affect
the
dimming duration of
dimming will
result.
If the power outage takes place after
more than
four
hours
hour before the expected end of the night then this deviating on-
time will be taken into account to
power-on time
of
the
won't affect the dimming duration of the next night. If the
outage takes
place
within
end
of
the night then this deviating power-on time will be
taken into account as a valid night
power-on time
of
the
then temporarily affect the dimming behavior.
Instead,
the
history
of
previous
time
duration
is
represent
normal
operation
the
last
three
while
gradually
adapting to the
drops
to
zero
for
This
only
means
to
the
regular
section).
If
the
duration
will
continue
to
handle
a
mains
will
be
calculated
the
next night
and not
closer than
at
calculate the
five
preceding nights.
However,
one
hour
before the
to
calculate the
three preceding
nights. This
the
driver
power-on
less
than
in
power-on
more
than
that
the
power-on
of
a
and
the
voltage
on
the
and regular
least
one
average
it
expected
average
will
35
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