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楼主 |
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; D" {5 I/ |+ h1 e6 p# D! V
increased until 150 % of the rated voltage, current or power is reached. The voltage or the
3 e' ]5 T- k! X. t+ K f( Tcurrent shall be increased until 150 % of the rated power is reached. The test shall be% \5 h. K$ I) u+ p8 R
continued until the LED module is thermally stabilised. A stable condition is reached, if the; z" b+ @1 f, }3 v
temperature does not change by more than 5 K in 1 h. The temperature shall be measured in
( i' D- \4 n9 X; S, q6 p1 vthe tc point. The LED module shall withstand the overpower condition for at least 15 min, the" f8 c9 L" H6 f& ^3 G
time period of which can lie within the stabilisation period if the temperature change is ≤ 5K.
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2 m* `, x4 G1 T1 r* o6 K; `; i$ z' pIf the module contains an automatic protective device or circuit which limits the power, it is2 y1 n$ T' B+ X9 m# q7 M
subjected to a 15 min operation at this limit. If the device or circuit effectively limits the power" @; ]: K6 n* b8 _5 E
over this period, the module has passed the test, provided the compliance (4.1 and last
! @$ q( i9 m4 V& yparagraph of 13.2) is fulfilled." n% k8 l$ R5 z" u* g9 R
After finalising the overpower mode, the module is operated under normal conditions until+ \! D1 S' G# ] u& U- Y; b8 c
thermally being stable.4 [/ i- p2 w4 P2 f1 S' G" B( h r
A module fails safe if no fire, smoke or flammable gas is produced and if the 15 min
2 I. R9 X- x9 e7 voverpower condition has been withstood. To check whether molten material might present a9 C) |6 B# n% J
safety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module
6 {: V2 Y T) p2 }8 Kshall not ignite. |
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