Table of Contents
Advertisement
8
Operation (Hardware references)
d&b 40D Reference manual 1.3 en
Operation (Hardware references)
8.1 Power supply
The device utilizes a switch mode power supply with active Power
Factor Correction (PFC) and automatic mains range selection.
The power supply is equipped with mains voltage monitoring,
overvoltage and undervoltage protection as well as an inrush
current limiter.
8.1.1 Active Power Factor Correction (PFC)
The active Power Factor Correction provides a clean and highly
efficient sinusoidal current draw, thus providing highest
performance under adverse mains conditions or when very long
power cabling is necessary.
The power factor is above 0.9 for mains power consumption
values of 350 W or higher.
8.1.2 Mains voltage monitoring
The mains voltage and frequency are recorded by the power
supply and can be viewed on screen. Where voltages outside of
this range are present, a self-resetting protective circuit responds
quickly to isolate the internal "Main Power Supply" leaving only a
supervisory circuit running to monitor the mains voltage. The device
accepts mains voltages of up to 400 V A C
the device in case of a missing neutral line or running phase to
phase.
8.1.3 Automatic mains range selection
The automatic mains range selection enables the device to be used
with any mains supply worldwide without the need for manual
action. The automatic range selection is only available on plug-in
but not during operation. Once in high or low range, the SMPS
expects a permanent mains voltage in this range. To switch from
one range to the other, the unit must be disconnected from the
mains.
The power supply incorporates a "Mains Power Supply" and an
"Auxiliary Power Supply".
Mains Power Supply
The Mains Power Supply feeds the power amplifiers within the
following nominal mains ranges:
High range
Low range
Auxiliary Power Supply
The Auxiliary Power Supply feeds the DSP section and the device
control and operates within the range from 55 V A C
400 V A C
.
RMS
without damage to
RMS
208 - 240 V A C
100 - 127 V A C
to
RMS
31
Advertisement
Table of Contents
