9 Glossary
9.1 Technical terms
Appliance protection Surge technology term
The conventional mains surge protection consists
of an mains earthwire (class B), an overvoltage
protection (class C) and an appliance protection
(class D) – see also e.g. under
http://www.phoenixcontact.de (topic „TRABTECH“)
Class D see appliance protection
DC/DC Booster Circuit technology to boost the direct current on a
higher voltage level
IGBT I
nsulated Gate Bipolar Transistor
The latest design of high-performance transistors
with minimum control power requirement (MOSFET
structure) and minimum losses on the output side
(structure of a bipolar transistor)
LED L
ight Emitting Diode
Electronic semiconductor component, commonly
called light diode. Used for optical signalling.
PFC P
ower Factor Correction
Circuit technology to minimize circuit backfeed
(important for non linear loads)
PWM P
ulse Width Modulation
Here: Circuit technology for generating a sinusoidal
voltage of the highest quality from an existing DC
voltage
SNMP Simple Network Management Protocol
common protocol in networks to manage / control
appliances
VFD Output V
oltage and Frequency Dependent from
mains supply
The UPS output depends of mains voltage and
frequency variations. Former notation: OFFLINE
VI Output V
oltage Independent from mains supply
The UPS output is independent of mains voltage
and frequency variations. The mains voltage
however is rectified by electronic / passive voltage
regulators. Former notation: LINE-INTERACTIVE
VFI Output V
oltage and Frequency Independent from
mains supply
The UPS output is independent of mains voltage
and frequency variations. Former notation: ONLINE
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