User Manual – Rev BE AMETEK Programmable Power
MX Series 199
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 the 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 boards.
The condition of the PFC section is constantly monitored and reported to the
system interface board. If the DC bus goes out of acceptable operating range, a
fault is generated. Furthermore, in any of the three AC input phases fails, the
MX will shut itself down.
5.7.2 Modulator 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 high (300 Vac
./ 400 Vdc) or low (150 Vac / 200 Vdc) output voltage range. Note that some
configurations of the MX Series may be hardwired for single range use.
The modulator contains several feedback loops that control the current sharing
and output regulation of the four power amplifier boards. The Modulator boards
connects to one of the three connectors on the System interface through a 50
pin ribbon cable located at the top front of each power module.
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