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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。
- a: c5 W+ Q" m# H! @8 s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?, j0 P9 {5 o! H. G$ o/ N/ O+ Q
3 |8 |& {5 `3 z. ?4 t, yPTC thermistor定义:
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3 S1 q" _) e8 g: R5 bPTC THERMISTOR8 E2 O! G' x0 I1 U, g. ~
thermally sensitive semiconductor resistor, which shows a step-like increase in its resistance0 g2 D! ^* c' j0 m ^1 {
when the increasing temperature reaches a specific value. The change of temperature is+ B$ n& B& ]* V% r6 v# F( f- J
obtained either by the flow of current through the thermosensitive element, or by a change in! {% U& b' ^* A' q' u
the ambient temperature, or by a combination of both |
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