User and Programming Manual
48
XDS
Series
6.4 Power Module (A9 through A11)
Refer to Figure 6-3 for a block diagram of the DC module. The DC module rectifies and filters the AC
mains voltage, switches the voltage with a phase modulated full bridge converter, passes the
switched voltage through a voltage scaling isolation power transformer, rectifies and filters the output
voltage, and directs the voltage to the output via bus bars.
The module mostly consists of the long amplifier board (A4), the small snubber (A5) and output filter
(A6) boards, electrolytic filter capacitors on the input and output, power transformer, current sense
transformer in the primary path of the power transformer, output rectifiers, and output inductor.
Power semiconductors are soldered to the amplifier board to provide various functions. A heat sink
provides not only a low impedance thermal path for the module, but also the structural base to which
most of the components are mounted.
The AC mains from the three phase AC power bus enters the DC module at E1/E2/E3. The voltage
passes through fuses and then a full wave rectifier (CR8-CR13). The DC voltage is filtered and
stored on two electrolytic capacitors. The capacitors are configured in parallel for 208 volt mains or
in series for 400/480 volt mains. High inrush current to the electrolytics is limited by a resistor. The
resistor is shorted out by an SCR, CR14, during module operation.
Note:
This bus bar is always live, even if the front panel On/Off switch is in the Off
position. Use extreme cautions when servicing any part of this product.
The rectified/filtered mains voltage provides the high power bus for the H-bridge converter. The
converter is phase-shift pulse width modulated using four IGBT’s, Q12-Q15. The 93.75 kHz PWM
clock frequency yields a 46.9 kHz frequency from the output of the H-bridge to the primary of the
power transformer. A current transformer in the primary wire of the power transformer senses over
current situations and is used for protection of the H-bridge.
A4
MODULE AMPLIFIER
A5
MODULE
SNUBBER
A6
MODULE
OUTPUT FILTER
AC
AC
AC
REMOTE
SENSE
VOUT +
VOUT -
E10 E11
E4
E5
E1
E2
E3
J6
SUPPLY/
CONTROL
BUS
INPUT BULK
STORAGE
CAPACITORS
CT
POWER
TRANSFORMER
DISCHARGE
E7
E6
INDUCTOR
CURRENT
SENSE
OUTPUT
CURRENT
SENSE
T-SWITCH
E9
E8
OUTPUT
INDUCTOR
Figure 6-3: Power Module Block Diagram
Содержание XDS 100-100
Страница 4: ...User and Programming Manual 4 XDS Series Electrical Safety Symbols Used in This Manual ...
Страница 27: ...User and Programming Manual XDS Series 27 Figure 3 5 Outline Drawing XDS DC Supply ...
Страница 41: ...User and Programming Manual XDS Series 41 Figure 5 4 Parallel Cable Interconnect Accessory ...
Страница 45: ...User and Programming Manual XDS Series 45 Figure 6 1 DC Power Supply Block Diagram IF option shown ...
Страница 69: ...User and Programming Manual XDS Series 69 Figure 8 3 Replaceable Fuse Locations ...