SPELLMAN HIGH VOLTAGE
Introduction 1
Installation and Operating Manual
Page1-8
118149-001 REV F
A-D and D-A converters and drivers provide system Fault Control and Indication. User interface is processed
on this PWB as well, providing isolated relay coils, opt couplers and open collectors contact.
1.3.7
Filament Power
The filament inverter provides the filament power for the X-ray tube. The filament inverter is a high frequency,
series resonant inverter. The inverter provides ac current to the primary of the filament isolation transformer.
The filament isolation transformer secondary is connected to the filament tube. The filament power is
2.25Vac/1.7Aac.
See Figure 1.2 for a simplified diagram of the X-RAY tube connection and current sensing circuits. The
filament circuitry also provides a variety of control, diagnostic and protection functions.
If any abnormal condition appears, monitoring circuitry will shut down the unit.
Figure 1.2 Simplified schematic of X-RAY tube connection
1.3.8
High Voltage Interlock
The XRB011 is equipped with safety interlocks for user personnel and equipment protection. An open interlock
circuit inhibits operation of the XRB011 MONOBLOCK.
POS HV MULT
NEG HV MULT
GND
+
-kV
+kV
FILAMENT
XFMR
X-RAY TUBE
ARC DETECT
mA Monitor
-
GND
GND
HV XFMR
HV XFMR
