SL SERIES MANUAL
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Chapter 4
P
RINCIPLES
O
F
O
PERATION
The SL Series of high voltage power supplies 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
SL 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 a
typical SL power supply.
•
Due to the many variations within the SL Series,
drawing numbers may differ from unit to unit.
The SL power supply is basically an AC to DC power
converter. Within the power supply, conversions of AC
to DC then to 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 SL is a compact, high efficiency, high voltage power
supply. The power supply can supply up to 1200 watts of
DC power. (Output power capability may be higher or
lower depending upon the model ordered). Output
voltages of up to 130kV 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.
