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Sharp QT-80W Instruction Manual Page 19

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2.8 Power Factor λ For all electric loads, the power factor λ is the ratio of effective power (P
eff
=
voltage x effective current) to apparent power (P
app
= voltage x apparent
current). This value is affected both by the phase displacement cos ϕ
between current and voltage by the current wave form distortion ε (non-
sinusoidal wave form)
λ = P
eff
/ P
app
= ε cos ϕ
In contrast to conventional control gear (CCG, inductive, 50 Hz), there is
hardly any phase displacement with Electronic Control Gear (high
frequency), which means that capacitor correction is not required. However
slight distortions in the current sine-wave curve occur during operation of
electronic control gear. In general these distortions are characterized by
integer multiples of the mains frequency (harmonics).
The harmonic content of the mains current is controlled by national and
international regulations (IEC 61000-3-2, EN 61000-3-2). OSRAM ECG
have built-in active electronic harmonic filters for this purpose which
guarantee a value for ε of more than 0.95 and hence a power factor λ
greater than 0.95.
Exemptions are ECG which apply to the international standard for system
power consumption less than 25 W. This standard requires a power factor
λ of more than 0.6. These ECG are part of the product segment ECO and
are known as QUICKTRONIC
®
ECONOMIC or QT-ECO. They are mainly
used to replace conventional control gear, but because of their
MULTIWATT-design they can partly operate FH
®
…HE- and FQ
®
…HO
fluorescent lamps with lower wattages:
FH
®
14W HE
FH
®
21W HE
FQ
®
24W HO
For detailed information about this combination please see
www.OSRAM.de/products/ecg
With regards to their harmonics content all QUICKTRONIC
®
have been
tested by VDE according to EN 61000-3-2 and carry the VDE-EMC
approval mark.
The confirmation of the ECG’s CE-mark by an independent testing facility
reduce the costs and the t.ime necessary for approval of luminaires
significantly.
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