kamisu 发表于 2012-11-24 15:00

家电产品,这样的电路安全吗?

我们公司最近推出一款加热器,还在设计阶段,要求做UL 499的标准,对美规产品一向没接触过啊,在此请教各们高手解答疑惑,先谢了。

如图圈出,按IEC中19.11.3中要求,短路IC 的PIN6 和GND 时,又上方的热断路器P15又不能动作时,是不是FAIL了?
美规UL中有没有例似的要啊?适用于哪一条款呢?再谢!

山炮 发表于 2012-11-24 16:48

为什么考虑热断路器P15失效?

craigyu 发表于 2012-11-24 17:58

把热保失效掉,热断路器失效掉,保险丝也失效掉,嗯,好了,美国人打算冻死了

H-RH 发表于 2012-11-25 00:14

"短路IC 的PIN6 和GND 时,又上方的热断路器P15又不能动作时"
F1 不是应该会烧断吗?如会烧断还有什么危险?

fasten 发表于 2012-11-25 08:35

首先P15要求满足以下要求:
5A.2.7 Controls
5A.2.7.1 A thermal cutoff shall comply with the Standard for Thermal-Links – Requirements and Application Guide, UL 60691.
5A.2.7.2 Except where superseded in this standard, a temperature control that complies with the construction requirements of the Standard for Temperature-Indicating and -Regulating Equipment, UL 873; the Standard for Limit Controls, UL 353; or the Standard for Automatic Electrical Controls for Household and Similar Use, Part 1: General Requirements, UL 60730-1, and the Standard for Automatic Electrical Controls for Household and Similar Use; Part 2: Particular Requirements for Temperature Sensing Controls, UL 60730-2-9, is considered to comply with the construction requirements of this standard. See Testing of Component Switches and Control Devices, Section 40 for performance requirements.

其次还要满足39 Abnormal Operation Test的要求,其中可能包括热断路器短路非正常测试,但是和零部件失效测试的要求是不一样的,看你是什么产品就做哪节测试。比如,如果是热水器则按:
39.10 Liquid heaters
39.10.1 A liquid heater is to be operated dry and with all automatic temperature controls or protective devices shunted out of the circuit, except as noted in 33.1.19.
但是判断条件是按39.1来判定:
39.1.1 If the conditions of normal operation are not representative also of abnormal conditions likely to be
obtained in actual service, a heating appliance shall not involve the risk of fire or electric shock when operated continuously under such abnormal conditions.

wanaut 发表于 2012-11-26 08:17

一般不考虑多个器件同时失效吧,要不谁都做不了。另外,限温保护之类的一次性器件如符合19.1第6段内容,一般不考虑其失效情况。

faige2006 发表于 2012-11-26 09:15

abnormal test應該考慮單一零件失效吧.

kamisu 发表于 2012-11-26 10:43

山炮 发表于 2012-11-24 16:48 static/image/common/back.gif
为什么考虑热断路器P15失效?

这个是加热器,在正常工作时,温度达到限值时会断开,温度下降后又回闭合。IEC 60335,19.11.3中要求按19.11.2的要求对相关测试重做一次,这个相关测试也包括19.4的温控器短路。那就是在温控失效的情况下的电子电路短路。UL 499中有这样的条款要求吗?

kamisu 发表于 2012-11-26 10:46

craigyu 发表于 2012-11-24 17:58 static/image/common/back.gif
把热保失效掉,热断路器失效掉,保险丝也失效掉,嗯,好了,美国人打算冻死了

19.11.3中要求按19.11.2的要求对相关测试重做一次,这个相关测试也包括19.4的温控器短路。那就是在温控失效的情况下的电子电路短路。

kamisu 发表于 2012-11-26 10:48

fasten 发表于 2012-11-25 08:35 static/image/common/back.gif
首先P15要求满足以下要求:
5A.2.7 Controls
5A.2.7.1 A thermal cutoff shall comply with the Standard ...

多谢指点
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