Siemens SWT-3000 - Functional Description; Technical Data

Power Supply SWT 3000 Equipment Manual
Page - 4 Edition p3_3_x 08/09 © SIEMENS AG 2006
Functional description
The input voltage is fed to the input capacitor via a fuse, an input filter and an inrush current limit-
ing element. This capacitor supplies the switching transistor of the single-ended converter. Each
output is supplied from a separate winding. The secondary voltage is rectified. The output voltage
ripple is minimized by means of a storage choke and subsequent output filter.
Output
filter 3
Output
filter 2
Output
filter 1
Control
circuit
Control
circuit
Control circuit
forward converter
70 kHz
Input filter
U
01
U
0
2
U
0
3
29
32
26
1)
2)
3)
4)
2
20
23
14
17
8
11
1) Transient protection in SVN types U
01
= +5V
2) Transient protection in SVB types U
02
= +12V
3) Link rectifier in SVN types U
03
= -12V
4) Inrush current limiting in SVN types
Figure 1: Block diagram of the AC-DC and DC-DC converter type SVB4 and SVN4
Technical data:
Table 1: Overview of technical data
Characteristic Conditions Power supply
type BM
PS 24 - 60V DC
Power supply type LM
PS 100-373V DC or 85-
264V AC
Unit
Input voltage range
U
i
AC
DC
- -
min 14 - max. 70
min 85 - max. 264
min 100 - max. 373
V
V
Input voltage nom. DC 30 310 V
Input current U
nom
2 0.2 A
Input fuse slow-
blowing
8 2.5 A
Output voltage 5V min 5.07 - max.
5.13
min 5.07 - max. 5.13 V
Output voltage 12V min 11.93 max.
12.07
min 11.93 max. 12.07 V
Ambient temperature min-25 - max.
+71
min-25 - max. +71 °C