pcb设计铜铂厚度、线宽和电流关系 -- 时间频率实验室.htm

学习用的

style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt">PCB</SPAN><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt">的载流能力取决与以下因素：线宽、线厚（铜箔厚度）、容许温升。大家都知道，<SPAN 
lang=EN-US>PCB</SPAN>走线越宽，载流能力越大。假设在同等条件下，<SPAN 
lang=EN-US>10MIL</SPAN>的走线能承受<st1:chmetcnv UnitName="a" SourceValue="1" 
HasSpace="False" Negative="False" NumberType="1" TCSC="0" w:st="on"><SPAN 
lang=EN-US>1A</SPAN></st1:chmetcnv>，那么<SPAN 
lang=EN-US>50MIL</SPAN>的走线能承受多大电流，是<st1:chmetcnv UnitName="a" SourceValue="5" 
HasSpace="False" Negative="False" NumberType="1" TCSC="0" w:st="on"><SPAN 
lang=EN-US>5A</SPAN></st1:chmetcnv>吗？答案自然是否定的。请看以下来来自国际权威机构提供的数据：<SPAN 
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=left><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt">供的数据：<SPAN 
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=left><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt">线宽的单位是：</SPAN><B 
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US 
style="FONT-SIZE: 12pt; COLOR: red; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt">Inch</SPAN></B><B 
style="mso-bidi-font-weight: normal"><SPAN 
style="FONT-SIZE: 12pt; COLOR: red; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt">（<SPAN 
lang=EN-US>1inch=2.54cm=25.4mm</SPAN>）<SPAN 
lang=EN-US><o:p></o:p></SPAN></SPAN></B></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=left><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt">数据来源：<I 
style="mso-bidi-font-style: normal"><SPAN lang=EN-US>MIL-STD-275 Printed Wiring 
for Electronic Equipment</SPAN></I></SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=left><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt"><I 
style="mso-bidi-font-style: normal"><SPAN 
lang=EN-US></SPAN></I></SPAN>&nbsp;</P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=center><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt"><I 
style="mso-bidi-font-style: normal"><SPAN lang=EN-US></SPAN></I><SPAN 
lang=EN-US><o:p><IMG 
src="PCB设计铜铂厚度、线宽和电流关系 -- 时间频率实验室.files/f421c86c-9152-44c7-bd74-3e173c301f84.jpg"></o:p></SPAN></SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=center><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt"><SPAN 
lang=EN-US><o:p></o:p></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=center><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt"><SPAN 
lang=EN-US><o:p>参考文献：<A 
href="http://space.ednchina.com/Upload/Blog/2008/6/15/0740c170-dbcb-4200-a94d-d37b7be14195.pdf" 
target=_blank><IMG alt=pdf 
src="PCB设计铜铂厚度、线宽和电流关系 -- 时间频率实验室.files/pdf.gif"></A></o:p></SPAN></SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=center><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt"><SPAN 
lang=EN-US><o:p></o:p></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; mso-layout-grid-align: none" 
align=center><SPAN lang=EN-US 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt"><v:shapetype 
id=_x0000_t75 coordsize="21600,21600" o:spt="75" o:preferrelative="t" 
path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f"><v:stroke 
joinstyle="miter"></v:stroke><v:formulas><v:f 
eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f 
eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f 
eqn="prod @3 21600 pixelWidth"></v:f><v:f 
eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f 
eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f 
eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f 
eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:extrusionok="f" 
gradientshapeok="t" o:connecttype="rect"></v:path><o:lock v:ext="edit" 
aspectratio="t"></o:lock></v:shapetype><o:p></o:p></SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=left><B style="mso-bidi-font-weight: normal"><SPAN 
style="FONT-SIZE: 16pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt">二、</SPAN></B><B 
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US 
style="FONT-SIZE: 16pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">PCB</SPAN></B><B 
style="mso-bidi-font-weight: normal"><SPAN 
style="FONT-SIZE: 16pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">设计铜铂厚度、线宽和电流关系</SPAN></B><B 
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US 
style="FONT-SIZE: 16pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt"><o:p></o:p></SPAN></B></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; TEXT-ALIGN: left; mso-char-indent-count: 2.0; mso-layout-grid-align: none" 
align=left><SPAN lang=EN-US 
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"><o:p>&nbsp;</o:p></SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; TEXT-ALIGN: left; mso-char-indent-count: 2.0; mso-layout-grid-align: none" 
align=left><SPAN 
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">在了解<SPAN 
lang=EN-US>PCB</SPAN>设计铜铂厚度、线宽和电流关系之前先让我们了解一下<SPAN lang=EN-US>PCB 
</SPAN>敷铜厚度的单位盎司、英寸和毫米之间的换算：<SPAN lang=EN-US>"</SPAN>在很多数据表中，<SPAN 
lang=EN-US>PCB </SPAN>的敷铜厚度常常用盎司做单位，它与英寸和毫米的转换关系如下：<SPAN lang=EN-US><BR><B 
style="mso-bidi-font-weight: normal"><SPAN style="COLOR: red">1 
</SPAN></B></SPAN><B style="mso-bidi-font-weight: normal"><SPAN 
style="COLOR: red">盎司<SPAN lang=EN-US> = 0.0014 </SPAN>英寸<SPAN lang=EN-US> = 
0.0356 </SPAN>毫米（<SPAN lang=EN-US>mm</SPAN>）<SPAN lang=EN-US><BR>2 
</SPAN>盎司<SPAN lang=EN-US> = 0.0028 </SPAN>英寸<SPAN lang=EN-US> = 0.0712 
</SPAN>毫米（<SPAN lang=EN-US>mm</SPAN>）<SPAN 
lang=EN-US><BR></SPAN></SPAN></B>盎司是重量单位，之所以可以转化为毫米是因为<SPAN 
lang=EN-US>pcb</SPAN>的敷铜厚度是盎司<SPAN lang=EN-US>/</SPAN>平方英寸<SPAN 
lang=EN-US>"&nbsp; &nbsp;</SPAN></SPAN><SPAN lang=EN-US 
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=left><SPAN lang=EN-US 
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">PCB</SPAN><SPAN 
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">设计铜铂厚度、线宽和电流关系表</SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=left><SPAN 
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"></SPAN>&nbsp;</P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=left><SPAN 
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"></SPAN>&nbsp;</P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=left><SPAN 
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"><SPAN 
lang=EN-US><o:p><A 
href="PCB设计铜铂厚度、线宽和电流关系 -- 时间频率实验室.files/408724a4-365f-411c-8892-0c75208a5065.jpg" 
target=_blank><IMG height=439 alt=点击看大图 
src="PCB设计铜铂厚度、线宽和电流关系 -- 时间频率实验室.files/408724a4-365f-411c-8892-0c75208a5065.jpg" 
width=520></A></o:p></SPAN></SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=left><SPAN lang=EN-US 
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=left><SPAN lang=EN-US 
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"><o:p>&nbsp;</o:p></SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=left><SPAN 
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"></SPAN>&nbsp;</P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=left><SPAN 
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">也可以使用经验公式计算<SPAN 
lang=EN-US>:<B style="mso-bidi-font-weight: normal"><SPAN 
style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 0cm; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 0cm; PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 1pt solid; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; mso-border-alt: solid windowtext .5pt"><SPAN 
lang=EN-US 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">0.15</SPAN><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">×线宽<SPAN 
lang=EN-US>(W)=A</SPAN></SPAN></SPAN></B></SPAN></SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=left><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">以上数据均为温度在</SPAN><B 
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US 
style="FONT-SIZE: 12pt; COLOR: red; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">25</SPAN></B><B 
style="mso-bidi-font-weight: normal"><SPAN 
style="FONT-SIZE: 12pt; COLOR: red; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">℃</SPAN></B><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">下的线路电流承载值<SPAN 
lang=EN-US>.</SPAN></SPAN><SPAN lang=EN-US 
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma; mso-font-kerning: 0pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">导线阻抗<SPAN 
lang=EN-US>:</SPAN></SPAN><B style="mso-bidi-font-weight: normal"><SPAN 
lang=EN-US 
style="FONT-SIZE: 12pt; COLOR: red; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">0.0005</SPAN></B><B 
style="mso-bidi-font-weight: normal"><SPAN 
style="FONT-SIZE: 12pt; COLOR: red; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">×<SPAN 
lang=EN-US>L/W(</SPAN>线长<SPAN lang=EN-US>/</SPAN>线宽<SPAN 
lang=EN-US>)</SPAN></SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN 
lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体"><o:p></o:p></SPAN></B></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none" 
align=left><SPAN 
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">电流承载值与线路上元器件数量<SPAN 
lang=EN-US>/</SPAN>焊盘以及过孔都直接关系</SPAN></P>
<P class=MsoNormal 
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none"