zt:°???????
°???????
1. °????ò?é:
°?????????°???±ê×?????,°????????ì??×°??????×é?????÷?·????????????,???á??????°????????·?????ú?·?????????????????????÷????????·???electric shock, energy hazards, fire, mechanical and heat hazards, radiation hazards??chemical hazards?????????ì????????.
??°???,???????ú?????????¨??×???±??ú??????°???±ê×?,?????ó?à?????????????÷???ì?§??????????IEC,VDE,UL,CSA°???±ê×?×÷??????°??????è?ó.UL??VDE??°???±ê×???±??????????ì,UL????±?????????·????§????????,??VDE?????ò±?????????×÷???±??°???,?????????????÷????,VDE????×????÷??????°???±ê×?.
°???????:?????????????????????±??.
2. ?????????÷?á??°????è?ó
(1) ?????è?ó(spacing requirements)
UL, CSA??VDE°?????????????×é??????,???°????×é???????¨????×é??????,???????¨???¨???????è?ó,?????è?ó°ü?¨?????à?????????à??,?????à????VDE???????????à??, ????UL???ò??·????à??, VDE±ê×??????????????à????UL±ê×????????ò????·????à??.
?????à??(Creepage distance):??????????×é???????ò??????×é????????????????????????·???????×????±???à??;
?????à??(clearance):??????±í??????????????×é???????ò??????×é??????????????????×????à??.
(2).???é????????????(dielectric test withstand)
?±×°?????????¨??????250Vac?ò???ü???±????UL??CSA±ê×????????è??×???????????????????????????????????????(HI-POT isolation test).
(3).?????÷????(leakage current measurement)
UL??CSA±ê×????????è???ù???????????¨????×é??±????è???????ó????,????????????????????1500????×è?÷???????????÷; VDE±ê×??????ò???¨??1.06±????¨??????, ??1500????×è?÷??150nF?????÷???????????????÷.
????????·?·¨????. SAFETY TEST & EVALUATION.
(4).??????×è( insulation resistance)
??VDE±ê×???????,????????SELV???????·?????è????7.0M????×?????×è???????????????????×??±?????????×é??????,?ò?è????2.0M????×?????×è??,?????????????ò??1·???500Vac.
*** SELV:°??????????????·(safety extra-low voltage circuit)???¨???????????±±??¤?è???????????·,????????????????????×é???????ò??????????????????×é?????ú?·??????±??¤??×????????????á????42.4Vacpeak?ò60Vdc?????????·;
ELV:???????????·(extra-low voltage circuit)???¨?????????????????????ò?????????????????÷????·?????????42.4Vac?ò?±?÷??????????60Vdc?????????·;
????????(hazardous voltage):???÷·???????42.4Vac?ò?±?÷????60Vdc??????.
?????à:???????·?±?????????÷???????ò?à????????·?;
?????à:??????????·??÷???????????????à,????????±????÷?????ü?????÷??×??????????????????à.
(5).PC°??è?ó(PC board requirements)
UL??CSA???????á????????±ê×?,???????ù??PC°?±?±?UL??????94V-2?ò???ü????????,??VDE?????à????????±ê×?.
??×???·???????????
·????????????à??HF-1??????HF-2??,HF-2??????HBF??;
??°?????:5V????V-0,V-0????V-1,V-1????V-2,V-2????HB.
3. ±????÷?á????°????è?ó
??VDE±ê×???????,????±????÷???è???????ì?????????????????????¨,???ú×??ó?à?????ü?ú????°????è?ó????UL±ê×????????????ó????±????÷?á???????ù????????±?????94V-2?ò???ü???????¨??.
(1).±????÷??????( transformer insulation)
±????÷????×é?????è?ó,±?????????×????í????·???,????×é?????????á,???á?ò?ó?á????,???°???ü??????×é??,???à???ü????·???????,?????è?ó???????????ò??????????.
(2).±????÷?????é??????(transformer dielectric strength)
?±?????????????????????±,????????????±??????????????é??????,?????±??????????????????????????????????±í??.
(3).±????÷????????×è(transformer insulation resistance)
????????±????÷???á????±???????×é????,???°????×é???ú?????ò??????°?????,±?????10M????×?????×è??,????1·??????á??500Vac????.
(4).±????÷???????????à??(transformer creepage and clearance distance)
??×é????;??×é??????,????°?,?ú??,?ò??,??×é?¨????????;????????;???????ú?????ò??????±????ú×????¨??????????.
(5).±????÷????×è(transformer moisture resistance)
????????91~95%???é????,??????20~30??????,±????÷??±???????×è???°?é??????.
(6).VDE??????±????÷???????¨??(VDE transformer temperature rating)
????????×÷???????¨????????????????×??ó?????¨??????±?????????????????????????.
??×???????????·????????????????????????????????¨????????
Y A E B F H C
90 105 120 130 150 180 180????
(7).UL??CSA??????±????÷???????¨??(UL and CSA transformer temperature rating)
?±?????????§????(25??)?????±,UL??CSA?????á???¨±????÷??????,??????????·?·¨??×???????????,????·¨????×è??·¨.
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