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12 List of Terms
12.1 Technical terminology
DC/DC booster Circuit technology for increasing a DC voltage to a
higher voltage level
SBS Static Bypass Switch
Appliance protection Term from overvoltage technology
Classic mains overvoltage protection consists of a
lightning surge arrester (class B), overvoltage protection
(class C) and, finally, the so-called appliance protection
(class D) – see also http://www.phoenixcontact.de
(“TRABTECH” topic)
IGBT Insulated 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)
Class D See appliance protection
LED Light Emitting Diode
Electronic semi-conductor component, commonly
referred to as an LED, used for optic signalling.
PFC Power Factor Correction
Circuit technology for minimising system disturbances
(particularly important when connecting non-linear
loads)
PWM Pulse Width Modulation
Here: circuit technology for generating a sinusoidal
voltage of the highest quality from an existing DC
voltage
SNMP Simple Network Management Protocol
A protocol encountered frequently in networks for
managing
/ handling components
VFD Output Voltage and Frequency Dependent on mains
supply. The UPS output is dependent on mains voltage
and frequency fluctuations. Earlier designation:
OFFLINE
VI Output Voltage Independent from mains supply
The UPS output is dependent on mains frequency
fluctuations, but the mains voltage is prepared by
electronic / passive voltage control units. Earlier
designation: LINE-INTERACTIVE
VFI Output Voltage and Frequency Independent from mains
supply. The UPS output is independent of mains voltage
and frequency fluctuations. Earlier designation: ONLINE
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