X2364 MANUAL
10
118044-001 REV E
X2364
ASSEMBLY TITLE
ASSEMBLY NO.
System Interconnect Top Assy
404551-001
Power/Cont Bd
404560-001
Multiplier Assy
403932-062
Filament Board
404241-004
Front Panel Bd
403895-005
Table 4.1 List of Main Assemblies
4.3 Inverter
The inverter is a series resonant, series/parallel loaded
topology. A proprietary control scheme is used for
regulating the power generated from the inverter. Q3 is a
module of two high speed IGBT’s. This device provides
high frequency switching to control the resonant current
flow. The typical resonant operating period is
approximately 10uSeconds. The gate control for the
switching devices is provided by T2 on the
CONTROL/POWER PWB. U4 and U5 are the gates high
current drivers. T2 provides line voltage isolation
4.4 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 voltage is approximately 5kV
peak at full output.
4.5 High Voltage Assembly
The High Voltage consists of a full wave, full bridge
multiplier. It utilizes various parallel/series arrangements
of a full wave voltage doubler.
Output filtering is typically provided by the capacitors of
the multiplier. Voltage feedback for regulation and
monitoring is provided by a high bandwidth
resistive/capacitive divider. 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.
4.6 Control/Power PWB
The majority of control circuits for power supply controls
are located on the CONTROL/POWER PWB.
+15VDC, -15VDC, and +10VDC is generated on the
CONTROL/POWER PWB. High Voltage On/Off control
is accomplished by K3, and its associated circuitry.
Interlock control is provided by K4.
Voltage feedback from the high voltage divider is sent to
U9. Gain adjust is provided on the FILAMENT PWB.
The KV feedback signal is sent to the front panel DVM
and to the RS232 REMOTE INTERFACE PWB for
remote monitoring. K2 provides switching between
feedback and program signal for the front panel DVM’s.
This allows the user to preset the desired output before
energizing high voltage.
Program voltages are typically ramped up to set level by
the slow start circuits of U10.
Arc sense circuits U15 and U18 provide sensing, quench
and indication of arc conditions.
Current feedback from the high voltage rectifier is sent to
sense resistors located on the FILAMENT PWB.
Calibrated feedback is then sent to U6.
An overvoltage protection circuit provides protection in
the unlikely event of a main control loop failure. R74 and
R75 provide the threshold for the overvoltage protection
(OVP) control.
U13 and U19 circuits provide visual indication of the
control mode, which is in operation. These signals are
sent to the FRONT PANEL ASSEMBLY for front panel
status indication.
The resonant control circuitry consists of a voltage to
frequency and voltage to pulse width converter. U22
generates all frequency and pulse width control signals.
U21 provides specific control functions for the resonant
control.
System Fault Control and Indication is provided by U23
U24, and U25 and associated circuitry. Diagnostic
signals are latched and then sent to the FRONT PANEL
ASSEMBLY for status indication.
