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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。
6 q0 U, ^6 Y# c# z% R9 E, x. q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 y' c9 Y/ p7 U G# ~ |PTC thermistor定义:0 K3 n- X0 P& W3 r
2.7.8
8 B/ A" e ~0 _! Q* H7 g3 RPTC THERMISTOR, u3 g; S% V, ^+ E* A2 j' @
thermally sensitive semiconductor resistor, which shows a step-like increase in its resistance& g: ?2 r& X+ d/ k l" B
when the increasing temperature reaches a specific value. The change of temperature is
. `1 n l. B8 R* I2 Jobtained either by the flow of current through the thermosensitive element, or by a change in
+ X( }, E3 l1 S7 Ythe ambient temperature, or by a combination of both |
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