IEC 60925 pdf download – DC supplied electronic ballasts for tubular fluorescent lamps – Performance requirements

IEC 60925 pdf download – DC supplied electronic ballasts for tubular fluorescent lamps – Performance requirements
1 Scope
This standard specifies general performance requirements for electronic ballasts for use ond.c. supplies having rated voltages not exceeding 250 V, associated with fluorescent lampscomplying with lEC 60081. lt shall be read in conjunction with IEC 60924.
Performance requirements for electronic ballasts for general,public transport and aircraftlighting are specified in Sections Two,Three and Four of this standard.
NOTE 1 In order to obtain satisfactory performance of fluorescent lamps with d.c. supplied electronic ballasts it isnecessary that certain features of their designs be properly co-ordinated. lt is essential, therefore, that specifica-tions for them be written in terms of measurement made against some common base-line of reference, which mustbe reasonably permanent and reproducible.
NOTE 2 These conditions may be fulfilled by reference ballasts. Moreover, the testing of ballasts for fluorescentlamps will, in general, be made with reference lamps and, in particular, by comparing results obtained on suchlamps with ballasts to be tested and with a reference ballast as specified in lEC 60921.
Definitions
2.1
starting aid
either a conductive strip affixed to the outer surface of a lamp, or a conductive plate which isspaced an appropriate distance from a lamp. A starting aid can only be effective when it hasan adequate potential difference from one end of the lamp
2.2
ballast lumen factor
the ratio of the light output of the lamp when the ballast under test is operated at its designvoltage，compared with the light output of the same lamp operated with the appropriatereference ballast supplied at its rated voltage and frequency
2.3
reference ballast
a special inductive-type ballast designed for the purpose of providing comparison standardsfor use in testing ballasts，and for the selection of reference lamps. lt is essentiallycharacterized by a stable voltage-to-current ratio，which is relatively uninfluenced byvariations in current, temperature and the magnetic surroundings (see annex B)
2.4
symmetrical inverter
a definition is under consideration
2.5
asymmetrical inverter
a definition is under consideration
3General note on tests
Tests shall be made under the conditions specified in annex A.
All ballasts specified in this standard shall comply with the requirements of lEC 60924.
Conformity with lEC 61547 may be declared by the manufacturer and need not form part ofthird party approval to this standard.
4Marking
Non-mandatory information which may be made available by the manufacturer:a) Ballast lumen factor.
b) Rated output frequency (at the design voltage,with and without the lamp operating).
c) Limits of the ambient temperature range within which the ballast will operate suitably at
the declared rated voltage range.
5 Starting
lt may be expected that ballasts complying with this standard，when associated with lampswhich comply with IEC 60081, will provide satisfactory starting (not hot restarting) of the lampwith an air temperature immediately around the lamp of between 10 °C and 35 °C at theminimum of the rated voltage range; and operation between 10 °C and 50 C at other voltageswithin the rated voltage range.
The lamp electrical characteristics,on the lamp data sheets in IEC 60081，apply to lampsoperated with a reference ballast at its rated voltage, in an ambient temperature of 25 ℃.
Ballasts shall provide reliable starting of the appropriate lamps over the limits of the ambienttemperature range declared by the manufacturer.
Compliance is checked by the tests of clauses 6 and 7 unless evidence of satisfactory lampife can be given by the manufacurer.
6 Open-circuit voltage at terminations of lamp
A ballast when operated at any voltage within its rated voltage range shall provide an open-circuit voltage at the lamp terminations such that;
a) the minimum r.m.s. voltage across the lamp is at least that shown in the third column of
table 1;
b) the peak voltage across the lamp does not exceed that shown in the fourth or fifth column
of table 1;
c) the minimum peak voltage from one end of the lamp to the starting aid shall be at least
that shown in the sixth column of table 1.