XRM MANUAL
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118032-001 REV G
Chapter 4
Principles of Operation
he XRM 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 XRM power supply. For details
on a specific circuit, consult Spellman’s Engineering
Department.
*Due to the many variations within the XRM series,
drawing numbers may differ from unit to unit.
The XRM power supply is basically a DC to DC
converter. Within the power supply, conversions of DC
to high frequency AC, then to high voltage DC takes
place.. By reviewing further the sub-assemblies, a basic
understanding of the process can be gained.
WARNING
To reduce the risk of fire, replace fuse with same type and
rating.
WARNING
Um die Brandgefahr zu verringern, muss die Sicherung
durch eine neue gleichen Typs ersetzt werden.
4.1 Chassis
The XRM is a compact, high efficiency, high voltage
power supply. The power supply can supply up to 50
watts of DC power. (Output power capability may be
higher or lower depending upon model ordered). Output
voltages of up to 65kV 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.
WARNUNG
Die verwendete und erzeugte Engergie des
Hochspannungsnetzteiles kann tötlich sein! Betreiben Sie
das Hochspannungsnetzeil nur wenn Sie ausreichendes
Kenntnis über mögliche Gefahren beim Ungang mit der
Hochspannung haben. Versuchen Sie nicht interne
Schaltkreise oder elektrische Bauelemente, die an das
Hochspannungsnetzteil angeschlossen sind, zu berühren.
Vergewissern Sie sich, daß alle Restladungen, die vor
oder nacj dem Betreib des Hochspannungsnetzteils
vrhanden sind, entladen werden. Weitere Informationen
finden Sie der IEEE-Vorschrift Nr. 510-1983.
4.2 Inverter
The inverter is a series resonant, parallel loaded topology.
A PWM scheme is used for regulating the power
generated from the inverter. Q1 is a high speed
MOSFET. This device provides high frequency
switching to control the resonant current flow. The
typical resonant operating period is approximately
15
μ
seconds.
T
