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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。& j t7 U- D( R4 V; ~6 u ?% R9 g; U
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 W; K6 T7 [) ]( ]
) f( _/ n7 M0 o. a. ^5 j2 kPTC thermistor定义:3 A5 W5 W- s( [2 Q0 z7 B& ]
2.7.8, @: W. y- z2 t
PTC THERMISTOR+ C. z, Y5 h. o/ D+ _% E- y
thermally sensitive semiconductor resistor, which shows a step-like increase in its resistance" Y4 a! H4 F3 u) I# a
when the increasing temperature reaches a specific value. The change of temperature is7 v1 c. K4 B5 i( b. k9 J
obtained either by the flow of current through the thermosensitive element, or by a change in0 }$ `* x H' {% f1 Q1 G* W& z
the ambient temperature, or by a combination of both |
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