Spellman uX50P50, Instruction Manual

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uX MANUAL 12 118151-001 REV A
Chapter 4
Principles of Operation
he uX series of modular X-ray generators 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 uX power supply. For details on
a specific circuit, consult Spellman’s Engineering
Department.
The uX 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 uX is a compact, high efficiency, X-ray generator.
The power supply can supply up to 75 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