DSH 560A Temperature limits of optoelectronic devices used for separation

小米

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 560A

Temperature limits of optoelectronic devices used for separation

1.5.2, 4.5.1, 5.3 * s. }- F, T5 m- @6 |! S* U; U9 f) q2 T

60950-1(ed.1)

Question:

During the tests of subclause 4.5.1 and 5.3, the temperatures of critical components shall be

evaluated and shall be compared to their limiting values. For certain materials and components, the standard provides detailed instructions (e.g. in Table 4B, Table B.1, Table C.1) and for others only general compliance statements are provided (e.g. Note 3 of Table 4B part 2, subclause 5.3.8).

Optocouplers are often located in proximity to heat sources (e.g. transformers). The reliability of the materials used as insulator can degrade if thermally overstressed. IEC 60950-1 does not provide limit values for opto- couplers, nor does Annex P provide a reference to relevant

component standards.

a: What are the limit values for optocouplers during normal operation of the EUT?

b: What are the limit values for optocouplers during fault operation of the EUT?

Decision:

Temperature ratings as shown on the corresponding component certificate ( refer to “Explanatory Notes” below for the relevant component standards) shall be taken as limit values. For optocouplers bridging safety isolation, the maximum temperature Ts shall not be exceeded during normal operation.

Additional information from IEC TC 108:

The requirements for optocouplers during fault testing are considered adequately covered by

subclauses 5.3.9.1 and 5.3.9.2 of the standard. There was no intention by TC108/MT2 that

temperature measurements be applied to optocouplers during fault testing. TC108 does not

support placing a minimum limit for Ts, such as the proposed 100 °C, on optocouplers for either normal or fault operation.

' ]2 D( a. U2 L% |: e3 T& x