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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。; ]! ^9 C1 n8 D; Z! D; Z& i
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?8 I U7 a) B l, t+ |
: c2 W6 r3 t: B" N# l3 D) x; Y7 BPTC thermistor定义:! h1 M5 v) U& R5 q0 y
2.7.8
! L$ s# O6 Q, A& ?; ?8 l7 BPTC THERMISTOR+ S5 o# x6 E# q- L I$ \
thermally sensitive semiconductor resistor, which shows a step-like increase in its resistance* E" M, g; `3 r2 D6 V
when the increasing temperature reaches a specific value. The change of temperature is
" M! r! Y0 o8 hobtained either by the flow of current through the thermosensitive element, or by a change in! I$ U9 H* [! l. t6 f% j
the ambient temperature, or by a combination of both |
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