Special requirements for abnormal condition tests for electronic ballasts for discharge lamps according to IEC 61347-2-12
IEC 61347-2-12 "Lamp control gear Part 2-12: Special requirements for electronic ballasts for discharge lamps supplied by direct current or alternating current: special requirements for electronic ballasts for discharge lamps (excluding fluorescent lamps)" explains the interpretation of the electronic ballasts as follows: This part specifies the general requirements and safety requirements for electronic ballasts for direct current or alternating current. Power supplies include AC power supplies of 50 Hz/60 Hz, 1000 or less. This type of ballast is a converter equipped with triggering and stabilising components, which can operate discharge lamps at DC or at a frequency different from that of the power supply.
Article 17 Abnormal states that the safety of the ballast shall not be impaired when it is operated in an abnormal state at any voltage between 90% and 110% of the rated supply voltage. The manufacturer may claim a different rated supply voltage range.
Conformity can be verified by the following tests.
Operate the ballast for 1h in accordance with the manufacturer's instructions and subject it to each of the following conditions (including heat sinks, if specified).
a) The lamp is not plugged in or is not triggered.
b) the lamp head is leaking; or
c) The lamp is working, but in rectified state.
The output is open when the test is carried out using condition a).
The circuit shown in Fig. 1 is to be used when the test is carried out using condition b).
D.U.T. - device under test.
Dr - a circuit having series diodes which are connected in anti-parallel and the same number of series diodes produces a voltage drop of 10 V to 15 V. The circuit is used for the test.
