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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
% B9 b8 H& Y% j* jincreased until 150 % of the rated voltage, current or power is reached. The voltage or the: d6 G b/ k; e/ s) X
current shall be increased until 150 % of the rated power is reached. The test shall be/ ]' F; P- F( Y6 M* ]
continued until the LED module is thermally stabilised. A stable condition is reached, if the. u4 Z% ?! G, e) \5 v* o
temperature does not change by more than 5 K in 1 h. The temperature shall be measured in+ b6 B4 F5 \& F7 L7 K1 ?
the tc point. The LED module shall withstand the overpower condition for at least 15 min, the
5 h# }1 _5 d' I1 v( vtime period of which can lie within the stabilisation period if the temperature change is ≤ 5K.
/ i- P7 K" ?& J. Q. j8 X, n$ }! S6 _- a; n7 L
If the module contains an automatic protective device or circuit which limits the power, it is; x; X0 k/ O8 J. q" [& F
subjected to a 15 min operation at this limit. If the device or circuit effectively limits the power5 o7 ?3 U& t [0 Z0 A/ [* H- {8 a
over this period, the module has passed the test, provided the compliance (4.1 and last& b2 Y, I! k* ?7 S
paragraph of 13.2) is fulfilled.
3 p2 k1 Z2 f R# o$ IAfter finalising the overpower mode, the module is operated under normal conditions until- R2 Z8 i. Z' q1 b! U
thermally being stable.
) y" G8 }0 a, j/ QA module fails safe if no fire, smoke or flammable gas is produced and if the 15 min
9 J$ P1 S4 U3 u. |6 j: t& J: v5 eoverpower condition has been withstood. To check whether molten material might present a
% O3 G( ?# d8 h" ^4 a. ^safety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module
P% I4 }+ d+ u5 c8 m* [4 wshall not ignite. |
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