X2364 MANUAL
9
118044-001 REV E
Chapter 4
P
RINCIPLES
O
F
O
PERATION
he X2364 high voltage power supply utilizes
sophisticated power conversion technology. A
variety of analog, digital and power conversion
techniques are used throughout. The intention of the
Principles of Operation is to introduce the basic function
blocks that comprise the X2364 power supply. For details
on a specific circuit, consult Spellman’s Engineering
Department.
See Table 4.1 for a list of the main assemblies found in
the X2364 power supply.
The X2364 power supply is basically an AC to DC
converter. Within the power supply, conversions of AC
to DC, then high frequency AC, then to high voltage DC
take place. By reviewing further the sub-assemblies, a
basic understanding of the process can be gained.
4.1 Chassis
The X2364 is a compact, high efficiency, high voltage
power supply. The power supply can supply up to 400
watts of DC power. Output voltages of up to 60kV can be
generated.
WARNING
The energy levels used and generated by the
power supply can be lethal! Do not attempt to
operate the power supply unless the user has a
sufficient knowledge of the dangers and hazards
of working with high voltage. Do not attempt to
approach or touch any internal or external
circuits or components that are connected or
have been connected to the power supply. Be
certain to discharge any stored energy that may
be present before and after the power supply is
used. Consult IEEE recommended practices for
safety in high voltage testing #510-1983.
4.2 Line Rectification and Filtering
Basic single-phase rectification provides the DC voltage
for the high frequency inverter. The line input voltage
can vary from 187 up to 264 volts within the X2364.
Circuit protection is provided by CB1 (SYSTEM BLOCK
DIAGRAM). CB1 is a fast acting magnetic trip type
circuit breaker. The line input is connected directly to the
line side of CB1. The load side of CB1 is connected to
the CONTROL/POWER PWB. The load side of CB1 is
also connected to T1 and, via. the HV ON/OFF relay to
the Remote Cooling Control socket. T1 is a step-down
type line transformer. T1 provides voltage for
housekeeping and control circuit power.
WARNING
LINE VOLTAGE IS PRESENT WHENEVER
THE POWER SUPPLY IS CONNECTED TO
EXTERNAL LINE VOLTAGES. BE SURE TO
DISCONNECT THE LINE CORD BEFORE
OPENING THE UNIT. ALLOW 5 MINUTES
FOR INTERNAL CAPACITANCE TO
DISCHARGE BEFORE REMOVING ANY
COVER.
When CB1 is ON, voltage is applied to CR10. CR10 is
an isolated diode rectifier bridge that contains the rectifier
diodes used for line voltage rectification. The output of
CR10 is connected to a capacitor filter (C11 through
C14). Capacitors are initially charged through resistive
inrush limiters.
Approximately 1 second after CB1 is turned on, a relay is
energized to short the resistor limiters. This relay is K1.
This DC voltage is supplied to the high frequency
inverter.
The DC rails are connected to the high frequency rail
capacitors. These capacitors are high frequency, low loss
type. Capacitors C21 and C22 provide the energy storage
for the high frequency inverter.
T
