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+ ?0 b! C" ^) ^* V0 y, V
output to the circuit under evaluation shall be connected to a variable resistance load. If the source under ' z5 F; ]) s, ]evaluation has multiple outputs, all other outputs shall be open-circuited. The output voltage to the circuit& I& g) K$ a2 j J
under evaluation shall first be measured under open circuit conditions. The variable resistance load on the 8 e# F( `- @7 x' L# U. A Foutput under test shall then be adjusted from open circuit to short circuit until an available current of 8 A8 n' c0 j: ?2 N2 G( j. b
can be obtained and sustained for one minute of operation. If 8 A cannot be sustained for one minute * g# a" K) r& b0 Gunder any condition of load, the test shall be discontinued。2 ]# n+ ^5 _0 M: a! E, A; G
* n) o' |2 g2 I' La variable resistance load 直流负载？还是可以用可变电阻器？ - i3 q! z1 G4 UThe 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？ ) a6 @. N! _" O7 U1 y3 G英语不行。求解答。- G* A h: \$ T1 A: I' \* S" U( R
. b( J( g7 @+ w, c, ~) B ' C \% c7 ]: G, d7 x1 ~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：0 C9 k# u9 P4 a+ m% \
1）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 B w( M/ c9 F; ^7 ?5 p! \
! b7 T5 `1 d. D% I# b2)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）8 l9 }+ Q- J4 F
:):):)