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SPELLMAN HIGH VOLTAGE ELECTRONICS CORPORATION
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9 Voltage Ranges from 8kV to 40kV,
Fixed Negative or Positive Polarity
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Available Output Power Increments of
4, 15 and 30 Watts
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Voltage/Current Regulation with
Automatic Crossover Control
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Voltage and Current Monitor Signals
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Fully Arc and Short Circuit Protected
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Pre5V Reference Output
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Comprehensive Standard Interface
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CE listed and RoHS compliant
Form, Fit and Function Design:
Spellman’s UM Series of printed circuit board mountable, high
voltage modules offer a form, fit and function replacement for
presently available commercially made units, while providing
additional features and benefits at competitive pricing. Utilizing
proprietary power conversion technology and Spellman's six
decades of high voltage experience, these SMT based high
voltage modules provide improved performance/reliability and
easier system integration at a lower cost when compared to
the competition.
Advanced Power Conversion Topology:
UM converters use a proprietary zero voltage switching
power conversion topology providing exceptional efficiency
and inherent low noise and ripple. Radiated emissions are
reduced compared to conventional switching topologies,
minimizing or even eliminating the need to shield the unit
from adjacent circuitry.
The high voltage output is generated using a ferrite core
high voltage step up transformer which feeds a half wave
Cockcroft-Walton voltage multiplier to obtain the specified
high voltage output.
Due to the fixed, high frequency conversion rate the output
capacitance is small resulting in minimal stored energy.
Through the use of generously rated surge limiting resistors
and a fast acting current loop, all units are fully arc and short
circuit protected.
Control and Regulation:
The actual output voltage generated is sampled via a high
impedance divider to create a voltage feedback signal. A
current feedback signal is created via a current sense resistor
in the low end return of the high voltage output circuitry. These
two accurate ground referenced feedback signals are used to
precisely regulate and control the units in addition to external
monitoring purposes.
Due to the UM’s unique converter topology it can provide
full current into low impedance loads or even a short circuit.
Standard units limit at 103% of maximum rated output current.
Standard Interface:
The Spellman UM Series interface provides current program-
ming capability and positive polarity, buffered, low output imped-
ance voltage and current monitor signals (zero to +4.64Vdc
equals zero to full scale rated). A voltage programming input is
provided where 0 to +4.64Vdc equals 0 to 100% of rated voltage.
Current programmability allows the user to set where the
unit will current limit, anywhere from 0 to 100% of maximum
rated current. This feature is beneficial where less than full
output current is desired, like in the case of protecting a
sensitive load.
The buffered low impedance voltage and current monitor
signals can drive external circuitry directly, while minimizing
loading and pickup effects. These features save the user the
expense and implementation of external interface buffering
circuitry while improving overall signal integrity.
This standard interface is made available via a row of 13
pins with 0.1˝ pin spacing. A legacy interface (7 pins on a
0.2˝ spacing) that is compatible with presently available
commercially made units can be provided by ordering the
“L” option.
Mechanical and Environmental Considerations:
The UM Series are solid encapsulated, printed circuit board
mountable, plastic cased converters. All units are encapsulat-
ed using a silicon based potting material which is consider-
ably lighter in weight than epoxy. Isolated, non grounded 2-56
machine screws thread into the module to securely mount it to
the printed circuit board, relieving any stress on the interface
pins. Mounting plates, brackets and flanged mounting options
are also available. High voltage output is provided via a 36˝
(914.4mm) minimum length of appropriately rated high volt-
age wire.
Regulatory Approvals:
Compliant to 2004/108/EC, the EMC Directive and
2006/95/EC, the Low Voltage Directive. Compliant to
2002/95/EC, RoHS. UL/CUL recognized, File E227588.
UM8-40
HIGH VOLTAGE
MODULE
www.spellmanhv.com/manuals/UM8-40
Corporate Headquarters
Hauppauge, New York USA
+1-631-630-3000 FAX: +1-631-435-1620
e-mail: [email protected]
www.spellmanhv.com
128074-001 REV. K
Spellman High Voltage is an ISO 9001:2008 and ISO 14001:2004 registered company
Copyright © 2010 Spellman High Voltage Electronics Corp.
