DSH 560A/590（IEC 60950-1）光電耦合器溫度限值是100℃/安規(guī)距離V型槽的80°角規(guī)則使用范圍

DSH 560A

Subject: Temperature limits of optoelectronic devices used for separation

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 ℃, on optocouplers for either normal or fault operation.

問題：

在4.5和5.3條款試驗(yàn)中，應(yīng)評估關(guān)鍵零部件的溫度并與它們的極限值進(jìn)行比較。對于某些材料和組件，標(biāo)準(zhǔn)提供了詳細(xì)說明，而對于其他材料和組件，僅提供了一般符合性聲明。

光電耦合器通?？拷鼰嵩矗ɡ缱儔浩鳎?。如果熱應(yīng)力過大，用作絕緣的材料可靠性會(huì)降低。IEC 60950-1未提供光電耦合器的溫度限值，附錄P也未提供相關(guān)標(biāo)準(zhǔn)參考。

問題a：EUT正常工作時(shí)，光電耦合器的溫度限值是多少？

問題b：EUT故障運(yùn)行時(shí)，光電耦合器的溫度限值是多少？

決定：

相應(yīng)零部件的規(guī)范上顯示的額定溫度值（參考IEC 60747）應(yīng)作為限值。對于橋接安全隔離的光電耦合器，正常工作時(shí)不得超過最高溫度Ts。

來自 IEC TC 108的附加信息：

標(biāo)準(zhǔn)5.3.9.1和5.3.9.2條款充分涵蓋了故障試驗(yàn)對光電耦合器的要求。TC108/MT2 無意在故障試驗(yàn)中測量光電耦合器溫度。TC108 不支持在正?；蚬收蠣顟B(tài)時(shí)對光電耦合器設(shè)置有關(guān)Ts的最小限制。

光電耦合器的溫度限值為100 ℃。

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DSH 590

Subject: Rule for creepage across grooves and similar surface discontinuities

Question:

As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners with angles greater or equal than 90 degrees are not bridged. IEC 60664-1 does not contain specific information at which angle less than 90 degrees bridging shall be applied. Some of the above mentioned standards specify that bridging shall be applied for angles less than 80 degrees.

Can this 80 degree rule be applied in general for all standards?

Decision:

Yes. The 80 degree rule shall be applied in general for all standards.

問題：

從 IEC 60664-1的4.2條款示例2和6中可以看出，角度大于或等于90度的角沒有被橋接。IEC 60664-1不包含小于90度橋接角度的特定信息。很多標(biāo)準(zhǔn)提到，橋接應(yīng)用于小于80度的角度。

80度規(guī)則可以普遍適用于所有標(biāo)準(zhǔn)嗎？

決定：

是的。80度規(guī)則應(yīng)普遍適用于所有標(biāo)準(zhǔn)。

以下標(biāo)準(zhǔn)完全適用80度角規(guī)則

IEC 60664-1

IEC 60335-1

IEC 61010-1

IEC 61058-1

IEC 61008-1

IEC 60947-1

IEC 60598-1

IEC 60065

IEC 60950-1

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