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请教各位大侠,在IEC/UL 60065里,对温度保护的thermistor有认证要求。但是我看到的是只是对PTC THERMISTOR有要求。但是很多产品是用的NTC thermistor,而且CB/UL的报告中也会控制这个两件,要求有认证。
! O/ ^$ q6 p+ n8 o不管NTC还是PTC,只要它的作用是一样的,应该要求也一样。但是标准里的确只要求了PTC, 为啥米CB/UL还要管控的NTC的认证呢?
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/ h$ g4 a# U, R3 \$ LPTC thermistor定义:
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PTC THERMISTOR9 q* o& {; X9 M
thermally sensitive semiconductor resistor, which shows a step-like increase in its resistance
( p- [7 d4 G T9 x, g% I0 Twhen the increasing temperature reaches a specific value. The change of temperature is" V+ _) F" z, V+ y) E) ^ m# L
obtained either by the flow of current through the thermosensitive element, or by a change in
' S, M! i: j5 A9 H2 u" C: Jthe ambient temperature, or by a combination of both |
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