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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。: b9 [: p0 w5 {9 t! h
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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8 T& l6 B8 T5 D" C! Z; o# APTC thermistor定义:" k5 b0 E- \* l8 ]9 n2 y" s; i
2.7.8
$ q% c6 h1 J- r' {+ d0 \PTC THERMISTOR
4 T o- y% ~8 J( Xthermally sensitive semiconductor resistor, which shows a step-like increase in its resistance+ i) z+ S" v% y
when the increasing temperature reaches a specific value. The change of temperature is% v; s& U5 }+ z! G* f
obtained either by the flow of current through the thermosensitive element, or by a change in( B) e1 a9 H' x1 O, |, m( N
the ambient temperature, or by a combination of both |
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