65的公放喇叭開孔
我有一个做65的公放,它的低音喇叭做在产品的底部,而且是很大一块如果把低音喇叭当作开孔,它上面是有PCB板的部分,所以TUV工程师要求要喇叭加铁罩(现产品没加)
各位是怎么看这部分呢,低音喇叭是不是不能被视为外壳的一部分?又一定要加铁罩吗?
只能说,如果你一直做UL的话,就不会有这样的疑问了。
据了解TUV, ITS都是最新改的要求。之前他们都是当成外壳的一部分的-----不过,很不幸,不符合标准。 需要从两个方面去看:
1) 若产品的底部开孔,不在这个区域(以PIS为中心,正上方50mm,底部已13mm为半径。构成一个锥体和半球型)内,则不需要加。 若在这个范围的是不能有开孔,至少要用一个V-1等级的挡住。(只要喇叭上的相关塑胶材质,喇叭布之类的有V-1的等级,也是可以认为开孔被挡住)
2)若底部的低音喇叭外部无任何机械防护,User 能直接碰到, 则需要对喇叭做一些机械测试,测验其是否有一定的机械防护能阻止User碰到内部的危险。若测试OK,则不需要加, 若测试Fail, 则需要。
仅仅是个人愚见,希望对你有帮助,见笑了。 这个是60065 9.1.1.2章节内容
9.1.1.2 Determination of ACCESSIBLE parts
In order to determine whether a HAZARDOUS LIVE part is ACCESSIBLE, the jointed test finger
according to test probe B of IEC 61032, is pushed against the enclosure or inserted through
any openings of the enclosure, including openings in the bottom, without appreciable force.
Through openings, the test finger is applied to any depth that the finger will permit and
is rotated or angled before, during and after insertion to any position. If the opening does
not allow the entry of the finger, the force on the finger in the straight position is increased to
20 N ± 2 N and the test repeated with the finger in angled position.
The test is repeated using small finger probes according to test probes 18 and 19 of
IEC 61032. This does not apply if the intended conditions of use prevent the apparatus from
being accessed by children.
Conductive parts, covered only by lacquer, solvent-based enamel, ordinary paper, untreated
textile, oxide films or beads are considered to be bare.
Moving parts of loudspeaker systems, such as dust caps or cones of drivers or passive
radiators, are not regarded as preventing accessibility.
一般整改方案,可以在喇叭开孔用金属片挡住,test probe B of IEC 61032,test probes 18 and 19 of
IEC 61032探不到危险带电体就OK。 实际上不少名机都是这种设计,低音炮朝下设计,以前TUV是没有这个要求的。
针对此情况,一个是加金属罩,另一个方法是,音腔室与电路板分离开来,有见过这结构,音响效果还不错。 4楼正解 里面的PCB部分是不是高压部件,就是>35V的部分?
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