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User Manual - Rev AJ
California Instruments
5.7.1 PFC Input Power Converter
The PCF section is located at the bottom of each power module. AC power enters the power
module at the PFC input section. The PFC section using a PWM boost converter to turn
unregulated three phase 140 V AC into a regulated ± 225 V DC bus. A bank of capacitors is
used to provide ride-through and to support high peak current demands from the amplifier
boards. The PFC PWM circuit drives a set of three high capacity IGBT's. These IGBT's connect
directly to the DC bus bars, which connect the PFC output to the Amplifier b
the
oards.
ce
hases fails, the MX will shut itself down.
5.7.2 M
o
The condition of the PFC section is constantly monitored and reported to the system interfa
board. If the DC bus goes out of acceptable operating range, a fault is generated. Furthermore,
in any of the three AC input p
odulat r Board
The modulator board is located directly above the PFC board and next to the four-board
Amplifier stack. The modulator board accepts an oscillator output reference signal as input and
drives the four amplifier boards using a high frequency PWM technique. The modulator has the
ability to drive the amplifiers in either parallel or series configuration, thus producing either a
(300 Vac ./ 400 Vdc) or low (150 Vac / 200 Vdc) output voltage range. Note that some
configurations of the MX Series may be
high
hardwired for single range use.
that control the current sharing and output
he Modulator boards connects to one of the
ule.
The modulator contains several feedback loops
regulation of the four power amplifier boards. T
three connectors on the System interface through a 50 pin ribbon cable located at the top front
of each power mod
MX
Series
152