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THEORY OF OPERATION
1.7
POWER CONDITIONER MODULE
3 Phase
AC Input
Front Panel
On/Off
Switch
FIGURE 1-7. POWER CONDITIONER MODULE BLOCK DIAGRAM
The power conditioner module, or power module, rectifies the AC input voltage into one
48 Vdc and two isolated 290 Vdc buses. This is accomplished in two separate stages of
the power module. The first stage (input stage) can consist of either a rectifier or a PFC
stage. Both the rectifier and the PFC input stages are configurable for two different
nominal AC input voltages: 208VAC L-L (USA) or 400VAC L-L (INTERNATIONAL). For
further information on configuring input voltages, contact the Elgar Customer Service
Department. The second stage consists of a DC/DC converter module that converts the
380 Vdc output of the input stage to one 48 Vdc and two isolated 290 Vdc buses.
1.7.1
RECTIFIER INPUT
The 3 phase AC input voltage to the rectifier input stage is delivered through a soft-start
circuit and rectified by a 3 phase bridge rectifier developing a 380 Vdc bus. When the
system is configured for USA input, the rectifier is wired as a 3 phase full-wave bridge
rectifier. When the system is configured for INTERNATIONAL input, the rectifier is
wired as a 3 phase half-wave rectifier. The rectified 380 Vdc bus is then delivered to the
DC/DC stage of the power module. The 380 Vdc bus is also used to power a series
regulator circuit, which provides +24 Vdc bus power for the control circuitry of the
rectifier stage.
1.7.2
POWER FACTOR CORRECTION (PFC) INPUT
The PFC module is used to limit the peak input current to the TW system by as much
as three to one, compared to the peak input current of the rectifier module. This
equates to a PFC input power factor of .99, compared to the power factor of the rectifier
module that is .6 (USA) and can be as low as .35 (INTERNATIONAL).
1-8
POWER
PFC
Input
Stage
Rectifier
Input
Stage
+
48VDC
+
290VDC
DC/DC
Converter
-
290VDC
TW SERIES
HSKP
Amplifier
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