|
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。* S9 ^" h. V* h9 j4 c. n. 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?
- Y. J+ E# _- J5 R
5 X# D8 N2 V5 ?! A, g! x8 |PTC thermistor定义:6 s! A1 }4 p+ ~) [- u! i
2.7.8$ `% O* x X4 U P, Q
PTC THERMISTOR$ A" p- J8 i& U- W( l8 F# k4 J
thermally sensitive semiconductor resistor, which shows a step-like increase in its resistance q, W" [, U% P+ }
when the increasing temperature reaches a specific value. The change of temperature is$ o) C ~. [: a2 e8 g. \) _
obtained either by the flow of current through the thermosensitive element, or by a change in' t. h8 f, g. H" ]3 w/ w6 H* s- D. }
the ambient temperature, or by a combination of both |
|