变压器的磁芯能做初级或次级使用吗?
如果在满足初次级有加强绝缘的情况下,变压器的磁芯能做初级或次级使用吗?即磁芯到初级或次级满足加强绝缘
这种结构的变压器对EMC有什么影响?
一般而言,磁芯是不做初级或次级对待的,初级至磁芯满足基本绝缘,磁芯至次级满足附加绝缘
或者磁芯悬空,或用两层绝缘包裹
各位出出注意,讨论下,谢谢! 只要可以满足标准要求,当成什么都可以 关键是达到规定的要求。 一般而言,磁芯是不做初级或次级对待的,初级至磁芯满足基本绝缘,磁芯至次级满足附加绝缘
特殊情况只需要一边最小1mm,两边加起来满足要求即可 答:我司有几款产品变压器的磁芯在结构上是悬空,但是当做初级处理的;一直很矛盾怎么会是这样的
标准中有此项说明吗?
请各位大侠赐教,谢谢。 变压器磁是可以做为初级元件来处理的,这种情况多用于开关电源产品内的高频变压器。
在标准中的Table 2H中有对此种情况进行了说明。见下文(摘录于标准)
The term "conductive part" refers to an electrically conductive part that is
– not normally energized, and
– not connected to any of the following:
• a circuit at HAZARDOUS VOLTAGE, or
• an ELV CIRCUIT, or
• a TNV CIRCUIT, or
• an SELV CIRCUIT, or
• a LIMITED CURRENT CIRCUIT.
Examples of such a conductive part are the BODY of equipment, a transformer core, and in some cases a
conductive screen in a transformer.
If such a conductive part is protected from a part at HAZARDOUS VOLTAGE by:
– DOUBLE INSULATION or REINFORCED INSULATION, it is termed a "double-insulated conductive part";
– BASIC INSULATION plus protective earthing, it is termed an "earthed conductive part";
– BASIC INSULATION but is not earthed, that is it has no second level of protection, it is termed a "basic-insulated
conductive part".
A circuit or conductive part is termed "earthed" if it is connected to a protective earthing terminal or contact in
such a way as to meet the requirements in 2.6 (although it will not necessarily be at earth potential). Otherwise
the circuit or conductive part is termed "unearthed". 引用第4楼Alexsong于2011-06-18 11:39发表的:
变压器磁是可以做为初级元件来处理的,这种情况多用于开关电源产品内的高频变压器。
在标准中的Table 2H中有对此种情况进行了说明。见下文(摘录于标准)
The term "conductive part" refers to an electrically conductive part that is
– not normally energized, and
.......
怎么看出来变压器磁是可以做为初级元件来处理的? 不理解! 这是一个很古老的话题了
举两个例子
开关电源,高频变压器,目前很多变压器是这样的,次级用三层绝缘线,这个时候一般就把磁芯看成初级。
线性电源,低频变压器,目前很多产品是这样的, 通过螺丝固定在外壳上,螺丝可以接触到,初级跟磁芯要满足加强绝缘,这个时候,如果输出也是安全低电压的话,就可以把磁芯看成次级。 LS一句话道出真谛 引用第7楼Williamh于2011-06-18 17:41发表的:
只要可以满足标准要求,当成什么都可以
我也同意
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