标题: 求助：UL 8750中的LVLE 电路，如何测试？谢谢！ [打印本页] 作者: 耿家云磊 时间: 2013-7-2 09:13 标题: 求助：UL 8750中的LVLE 电路，如何测试？谢谢！ 8.14.2 The input to the source under evaluation shall be connected as intended in the end product. The 6 v" `; t* X6 x+ o7 z7 h4 Routput to the circuit under evaluation shall be connected to a variable resistance load. If the source under$ M$ |3 `/ R) r3 H* R4 c r/ |: n0 k
evaluation has multiple outputs, all other outputs shall be open-circuited. The output voltage to the circuit$ q6 O1 i# @3 h! T1 _3 D) x( E, ]
under evaluation shall first be measured under open circuit conditions. The variable resistance load on the + x: @+ m* S5 A1 S. E8 ~output under test shall then be adjusted from open circuit to short circuit until an available current of 8 A $ k- Z* g+ w# F, o Z' Lcan be obtained and sustained for one minute of operation. If 8 A cannot be sustained for one minute 2 H# I" t4 a3 j6 L9 B" w3 \) p0 b) sunder any condition of load, the test shall be discontinued。$ k }( k3 G9 G* R: k/ p- L, A
3 ^5 ~1 f: ?- C# G8 C9 g; l0 h a variable resistance load 直流负载？还是可以用可变电阻器？ * l) [7 U* D: Z4 H0 Y9 yThe variable resistance load on the output under test shall then be adjusted from open circuit to short circuit until an available current of 8 A can be obtained and sustained for one minute of operation这个开路和短路如何测试呢？得到并维持8A的电流一分钟？ 9 I) s4 ^# a% c5 z' L& T6 P3 w& Z* l英语不行。求解答。 . G* U2 u9 X: _8 r/ y 1 F w1 A! H4 C ' l0 }# z( M( K# v+ i1 z8 l: q作者: jjlamshushushu 时间: 2013-7-2 09:36
用可变电阻器作者: jjlamshushushu 时间: 2013-7-2 09:38
负载端调节滑动变阻器，慢慢将电流增加到8A，维持1分钟作者: jsspace 时间: 2013-7-2 09:43
我做过几次LVLE的目击，我们采用的是直流电子负载，另外，提醒一下这个测试本身的可操作性不是很强，应该采用UL1310的“Output Current and Power Test”来测试，步骤我简单总结如下： * p+ Y# Q' i- O# }4 Y+ f' P! Z1）首先进行短路测试，找出短路测试中哪些元器件短路后产品不会shut down . 7 t# E. y4 B9 P* O3 ?, t: D+ ^ 3 z+ E& `0 O- @* ]9 `2)测量短路开路对应的最大电流（滑动电阻最大时对应的电流，滑动电阻为0时对应的电流）% m* Y8 e% b& Y0 G/ y6 K) ]
: G; [( E i" a3）短路步骤1）中元器件，记录输出电流。（滑动电阻从最大调节到0，观察这个过程中的最大电流电压） * V. H/ ^) x- e: P6 O
, X8 A5 s: T/ Z# M+ Q 作者: walter5198 时间: 2015-6-22 20:21 :):):)
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