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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。: U a1 j9 N- W- S8 M! O( e8 s8 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?7 ^& {% T' S# M6 C$ F
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PTC thermistor定义:. ?( d- C% D) q3 x- l7 s
2.7.8
3 e' r2 e. @; d; MPTC THERMISTOR( Z. \; t( k. A0 V
thermally sensitive semiconductor resistor, which shows a step-like increase in its resistance+ X" \( v' a. s* C
when the increasing temperature reaches a specific value. The change of temperature is
! G# i! A. L4 E: k' C% hobtained either by the flow of current through the thermosensitive element, or by a change in
2 U8 m, u5 a, k$ _" U5 Kthe ambient temperature, or by a combination of both |
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