Reference Manual

Unit Description, PSU 1200 W
15 Unit Description, PSU 1200 W
This chapter describes the Power Supply Unit (PSU) which is available
in two versions: PSU AC and PSU DC.
The PSUs constantly regulate and deliver 1200 W off power over the
whole output range from 22 to 29 V DC.
15.1 PSU AC
The PSU rectifies the incoming AC power to the regulated DC voltage
required.
15.1.1 Block Diagram
Bridge Boost
DC/DC
Output
Filter
Input Filter
Control and Supervision
Indi-
cators
Opto
Interface
AC
Mains
DC
Output
P007804A
Control Alarm
Figure 105 PSU AC block diagram
The PSU AC consists of the following main units:
• Input filter (EMC filter)
• Bridge
• Boost converter
• DC/DC converter
• Output filter (EMC filter)
• Control and supervision circuits
Input Filter
The incoming sine voltage first passes through an internal fuse and then
the input filter, where it is filtered to prevent unwanted signals from
being radiated from the PSU.
Bridge
The bridge rectifies the incoming AC.
EN/LZT 720 0008 P2A
2001-11-28
185 (485)
© Ericsson Radio Systems AB
— All Rights Reserved —
Preliminary