Section 2 - Functional Description
2-21
Power Factor Regulator (PFR) Substitution Board
The PFR Substitution Board is an interface adapter that rectifies the 240VAC power voltage
from the Low Voltage Power Supply and applies it to an energy storage capacitor. This board
may be replaced in future XRC designs by an active filter (Power Factor Regulator) designed to
control the crest factor and wave shape of the current drawn by the XRC from the power source.
Duty Cycle Regulator
The Duty Cycle Regulator generates power pulses of controlled amplitude for application,
through the H-Bridge, to the high voltage transformer in the X-ray source unit. These power
pulses are generated by a switching regulator transferring charge from the energy storage
capacitor to the load through a transfer inductor. The pulse amplitude determines the peak
energy of the X-rays generated by the X-ray Source Unit.
H-Bridge Board
The H-Bridge alternately connects the output pulses from the Duty Cycle Regulator to the high
voltage transformer in the X-Ray source unit with forward and reverse polarity.
Interface Connections
Figure 2-9 shows the high-level interconnections of the five X-Ray Controller Assembly boards.
Figure 2-10 through Figure 2-14 show the interface connections between the five boards. Table
2-11 through Table 2-19 describe the interface signals and identify the interconnection
connector and pin assignments among the five boards.
LOW
VOLTAGE
POWER
SUPPLY
PFR
SUBSTITUTION
BOARD
I/O
and
LOGIC
BOARD
H-BRIDGE
BOARD
DUTY
CYCLE
DRIVER
BOARD
To/From
C-Arm
Interface
From
Power
Module
Rela
Control
Power
340 VDC
Reference
240 VAC
Isolated Power
Timin
Brid
e Control
AC Power
Filament Drive
Beam Current Sense
X_RAY
SOURCE
Sense
Figure 2-9. X-Ray Controller Assembly High-Level Interconnection Diagram
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