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Power Supply Unit
4
FunctionDescription
Figure 1 PSU –DC block diagram
The PSU DC consists of the following main units:
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•
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4.1
Input filter
The incoming voltage passes through the input filter first, where it is filtered to
prevent unwanted signals from being radiated from the PSU.
4.2
DC/DC Converter
The DC/DC converter is a phase-shifted, full-bridge converter that converts
the DC into a square wave. This is then fed into the primary side of the
transformer. The converter limits the current in case of overload.
In the transformer, the voltage is converted to a 24 V AC square wave, and
this wave is rectified to DC through a diode rectifier.
The output provides constant power regulation, rather than the more common
current limited, and delivers 1200 W over the whole output voltage range from
22 to 29 V DC.
4 (6)
DC
Input
Indi-
cators
Input filter (EMC filter)
DC/DC Converter
Output filter (EMC filter)
Control and supervision circuits
DC/DC
Control and Supervision
Opto
Interface
Control Alarm
DC
Output
P007805A
EN/LZT 720 0248 R1B
PSU DC
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