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发表于 2013-6-26 13:43
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The LED module shall be switched on and the power monitored (at the input side) and
5 Y* v# W5 B9 l* i* {' Uincreased until 150 % of the rated voltage, current or power is reached. The voltage or the
9 N# W" `$ G* I b7 I h% F8 ~) @current shall be increased until 150 % of the rated power is reached. The test shall be1 o. A6 s$ i( P$ Z* I3 B2 w
continued until the LED module is thermally stabilised. A stable condition is reached, if the; L! J9 i' L l5 l7 v, ~1 e' T
temperature does not change by more than 5 K in 1 h. The temperature shall be measured in( p/ @1 W$ o' ?8 A5 Q
the tc point. The LED module shall withstand the overpower condition for at least 15 min, the+ c; a1 w; {( _/ ^ g' K
time period of which can lie within the stabilisation period if the temperature change is ≤ 5K.% ]% A7 r Y* d- q1 P0 X. h
; c4 |6 N2 f! AIf the module contains an automatic protective device or circuit which limits the power, it is2 I, b1 F% h4 y: }; u
subjected to a 15 min operation at this limit. If the device or circuit effectively limits the power
# i6 c+ \% u. W+ U8 M9 Fover this period, the module has passed the test, provided the compliance (4.1 and last
6 } p! D% c- Y1 I5 Tparagraph of 13.2) is fulfilled.! r2 X' {" D# @+ s$ `. b. L6 ?
After finalising the overpower mode, the module is operated under normal conditions until
l$ J1 l+ H! W0 e" G% X( tthermally being stable.
8 x) W) o! N# V& C1 M) |) n" YA module fails safe if no fire, smoke or flammable gas is produced and if the 15 min# E4 f& B9 U7 Q- \
overpower condition has been withstood. To check whether molten material might present a
% h5 L7 g7 ~# P2 J9 f$ z% y5 asafety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module
* s% \/ ?. C( U/ ~7 Dshall not ignite. |
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