DL2482 datasheet(54/82 Pages) OSRAM

54 / 82 page

Economical long-life light sources with plug-in bases.

Compact Fluorescent Lamps OSRAM DULUX®

Technical Guide

Data for control

gear manufacturers

5.1

Electronic

operation

5.1.1 Preheating

(ECG operation)

Fluorescent lamps and compact fluorescent lamps cannot be operated directly from

the mains supply; they need a control gear. This may be integrated in the lamp (as in

the case of OSRAM DULUX® EL lamps) or may take the form of an external unit

connected between the lamp and the mains outlet (as with all CFLs with pin bases).

Models with two-pin bases are designed to operate with conventional control gear;

lamps with four-pin bases are designed to operate with electronic control gear (high

frequency operation). In either case, the operating data of the control gear must be

tailored to the lamp data.

The advantages of high-frequency operation are greater economy, longer lamp life,

greater switching resistance and more comfortable light than it is the case with

choke/starter circuits. To make best use of these advantages, however, it is important

to ensure that the permissible operating data listed below for preheating, igniting and

operating the lamps maintained. The values in the table apply to an operating fre-

quency of 25 kHz and a sinusoidal voltage (crest factor 1.4) during operation with no

ignition aids.

Starting lamps with filament preheating (warm start) is recommended by OSRAM as

the standard starting procedure. In a warm start, the electrodes are heated by a pre-

heating current with energy Qpreheat to the emission temperature before the lamp is

ignited.

The necessary or permissible preheating current is determined by the design of the

electrodes and the preheating time tpreheat selected. Preheating times of less than

0.4 s are generally not permissible for compact fluorescent lamps. This is because

with such short times it is impossible to ensure sufficiently uniform heating along the

entire length of the electrode.

The minimum and maximum permitted preheating energy can be calculated using the

parameters in the following table for various preheating times. Violating these limit

values will cause blackening around the electrodes and shorter lamp life, particular if

the lamp is switched on and off frequently. Compliance with the prescribed limits is

tested on control gear using an equivalent resistor Rsub which is connected to the

control gear instead of the lamp electrodes. The energy fed into this resistor is

measured over the selected preheating time. For the testing of the minimum limit

Qpreheat, min a substitution resistor Rsub min is used. For the maximum limit (correspond

with a higher electrode resistance) a substitution resistor Rsub max is used.

Rsub max is separately defined, the rule of thumb Rsub max = 4/3. Rsub min is in force.

The minimum and maximum value of the preheat energy is calculated by

Q preheat, min = Q + Pt preheat

Q preheat, max = 2 · Q preheat, min

If electrode preheating is carried out with a constant current Ipreheat or constant

voltage Upreheat the necessary current or voltage can be calculated as follows:

Upreheat, constant =

QR sub

+ PR

sub

t preheat

I preheat, constant =

Rsubt preheat

Rsub

5. Data for control gear manufacturers

DL2482 Datasheet(PDF) 54 Page - OSRAM GmbH

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