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12 Appendix
12.1 Technical terminology
Class D See Device protection
DC/DC Booster An electronic circuit that converts a source of direct current
(DC) from one voltage level to a higher voltage level
Device protection Term used as part of surge protection concept
The conventional mains surge protection consists of
a lightning arrester (class B), surge arrester (class C)
and finally the so-called device protection (class D)
EBM Extended Battery Module
IGBT Insulated Gate Bipolar Transistor
High-efficiency transistors in state-of-the-art design with
simple gate-drive characteristics (MOSFET design) and
lowest losses in output (structure of a bipolar transistor)
LED Light Emitting Diode
Electronic semiconductor component, used for visual
signaling
PFC Power Factor Correction
Circuit technology used to minimize the harmonic current
(particularly important when connecting non-linear loads)
PWM Pulse Width Modulation
Here: Circuit technology to generate a sine-like flux
density waveform of highest quality from existing direct-
current voltage
SNMP Simple Network Management Protocol
Frequently used protocol in the network to manage /
administrate components
VFD Output Voltage and Frequency Dependent from mains
supply. The UPS output is dependant on mains voltage
and frequency fluctuations.
Formerly known as: OFFLINE
VI Output Voltage Independent from mains supply
The UPS output is dependant on mains frequency
fluctuations, but the mains voltage is prepared by
electronic / passive voltage regulation devices.
Formerly known as: LINE INTERACTIVE
VFI Output Voltage and Frequency Independent from mains
supply. The UPS output is independent on mains voltage
and frequency fluctuations. Formerly known as: ONLINE
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