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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
: B1 M5 t8 x8 S+ I" Cincreased until 150 % of the rated voltage, current or power is reached. The voltage or the
7 {6 G) K- Q# D; fcurrent shall be increased until 150 % of the rated power is reached. The test shall be
7 G* x6 t2 P& { B8 q Q2 C ucontinued until the LED module is thermally stabilised. A stable condition is reached, if the
) d; G$ ^7 I7 |temperature does not change by more than 5 K in 1 h. The temperature shall be measured in' s" [7 `, ], S) y2 `
the tc point. The LED module shall withstand the overpower condition for at least 15 min, the
. d( Z4 k, X1 n# O) wtime period of which can lie within the stabilisation period if the temperature change is ≤ 5K.
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If the module contains an automatic protective device or circuit which limits the power, it is
8 q1 i# {6 B7 e( y% `% t9 qsubjected to a 15 min operation at this limit. If the device or circuit effectively limits the power7 M' z$ L( F6 P+ X7 | E6 F
over this period, the module has passed the test, provided the compliance (4.1 and last v3 w* A" g e# W$ b( ]$ c$ G
paragraph of 13.2) is fulfilled.$ B' W0 M x- _; }1 g& Y8 ^
After finalising the overpower mode, the module is operated under normal conditions until
- t9 D. ^9 ?4 Q1 V: M7 Y" R( zthermally being stable.( h9 M8 M% U P$ v) w; q' _
A module fails safe if no fire, smoke or flammable gas is produced and if the 15 min( _- f7 Y& S$ D" I
overpower condition has been withstood. To check whether molten material might present a8 m3 a! ?$ q: v8 A! \; U3 l+ ]
safety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module/ O8 m" F( w* @6 T
shall not ignite. |
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