12 Glossary

12.1Technical 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

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)

LED

Light Emitting Diode

 

Electronic semiconductor component, commonly

 

called light diode. Used for optical signalling.

PFC

Power Factor Correction

 

Circuit technology to minimize circuit backfeed

 

(important for 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

 

common protocol in networks to manage /

 

control appliances

VFD

Output Voltage and Frequency Dependent

 

from mains supply. The UPS output depends

 

of mains voltage and frequency variations.

 

Former notation: OFFLINE

VI

Output Voltage 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 Voltage and Frequency Independent

 

from mains supply. The UPS output is

 

independent of mains voltage and frequency

 

variations. Former notation: ONLINE

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