D7BCT datasheet(41/54 Pages) OSRAM

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OSRAM DULUX® EL – electronic energy saving lamps

Economical alternatives to ordinary light bulbs

Technical Guide

3.5.8 Operation on

BUS systems

3.5.9 Operation on

non-sinusoidal

voltage sources

3.5.10 Phase shift

Power factor

PF correction

If the OSRAM DULUX® EL lamp is controlled by a BUS system, the requirements of

Sections 3.5.4 and 3.5.5 must be met.

Operation of OSRAM DULUX® EL lamps on non-sinusoidal voltage sources (e. g.square

wave and trapezoidal inverters) is not straightforward.

It should be remembered that steep signal edges with square-wave inverters mean

additional reverse recovery losses for the rectifier and that frequently observed over-

shoots by powerful inverters may lead to increased charging currents in the electrolytic

capacitor (increased crest factor) and, in the worst case scenario, to significant over-

voltages. In the event of a high energy overshoot, the electrolytic capacitor charges up

to its peak value.

The rms currents should under no circumstances exceed the values for sinusoidal

supply and there should be no overshoots. In selecting the inverter, bear in mind that

at the moment its is started an OSRAM DULUX® EL lamp has four times the

current draw for less than 100 ms (or up to several seconds if the lamp is started at

a low temperature) (temporary overload capacity of the inverter). It must be possible

for the electrolytic capacitor (typically 1 to 6,8 µF) to be charged by the inverter

(start-up current, stability of the control loop).

The phase shift factor cos

ϕ indicates the phase shift between mains current and

mains voltage and relates exclusively to the fundamental harmonic (50 Hz).

The phase shift of harmonics that occur because of non-sinusoidal current draw is not

considered here.

OSRAM DULUX® EL lamps have a phase shift factor cos

ϕ of ≈ 0,95 (capacitive).

The power factor (

λ) is defined as:

λ = active power N/(rms current lrms x rms voltage Urms).

For OSRAM DULUX® EL LONGLIFE and ECONOMY it is approximately 0.6.

This value results from the distorted non-sinusoidal draw (mains current harmonic

content) of OSRAM DULUX® EL LONGLIFE and ECONOMY and to a lesser extent

from a current/voltage phase shift of the 50 Hz component. For this reason, correction

of the power factor by capacitors, which is usual with fluorescent lamps in CCG mode,

is not possible.

The actual energy consumption of OSRAM DULUX® EL LONGLIFE and ECONOMY

lamps is only 20 % of that of an incandescent lamp of similar light output. It is

independent of the power factor and is determine only by the active power, which

can be measured by a standard ammeter. The savings of 80 % have a direct impact

on fuel consumption (coal, oil, gas) and on emissions from power stations.

Because of the lower power factor of around 0.6, the power consumption of

OSRAM DULUX® EL LONGLIFE and ECONOMY lamps is not reduced to 20 %

but to around 33 %. This causes an appropriate reduction in current

draw and not an increase in the losses between the generator and load, and

therefore additional energy savings.

3. Lamp data and lamp properties

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