Spellman uX50P50, Instruction Manual

uX MANUAL 

13 

118151-001  REV A 

4.3 High Voltage Transformer 

The output of the High Frequency Resonant Inverter is 
connected to the primary of the High Voltage 
Transformer.  The High Voltage Transformer is a step-up 
type.  Typically secondary voltages are in the range of 
5kV depending upon output voltage ratings.   

4.4 High Voltage Assembly 

The High Voltage Assembly will vary depending upon 
the model ordered.  The circuitry typically consists of 
series arrangements of a half wave voltage multiplier.  
The higher voltage ranges utilize various series 
arrangements of a voltage doubler.  

Output filtering is typically provided by an R-C type 
filter.  A high bandwidth resistive/capacitive divider 
provides voltage feedback for regulation and monitoring.  
Current feedback for regulation and monitoring is 
provided by a sense resistor connected at the low voltage 
end of the High Voltage Rectifier/Multiplier Circuit. 

4.5 Control PWB 

The majority of control circuits for power supply controls 
are located on the CONTROL/POWER PWB. 
+15VDC, -15VDC, and +10VDC are generated on the 
CONTROL/POWER PWB.  High Voltage On/Off control 
is accomplished by K2, and its associated circuitry.  
Interlock control is provided by K2. 

Voltage feedback from a high voltage divider, located on 
the High Voltage Assembly, is sent to U16.  Gain 
adjustment is provided by R98.  The KV feedback signal 
is sent to the 15 pin D connector for remote monitoring. 

Program voltages are typically ramped up to set level by 
the slow start circuits of U16. 

Current feedback from the high voltage rectifier is sent to 
sense resistors located on the High Voltage Assembly.  
Feedback is then sent to U15. 

The resonant control circuitry consists of a voltage to 
pulse width converter.  U17 generates all pulse width 
control signals. 

4.6 Filament Supply         

The filament inverter provides the power for the X-ray 
tube filament. The filament inverter is a high frequency 
inverter. The inverter provides regulated current to the 
primary of the filament transformer.  The filament 
isolation transformer secondary is then connected to the 
output connector. 

4.7 Options         

Due to the many variations of models and options 
provided in the uX series, details of actual circuits used 
may differ slightly from above descriptions.  Consult 
Spellman’s Engineering Department for questions 
regarding the principles of operations for the uX series.