PTC材料及PTC电热元件
<P class=MsoNormal style="MARGIN: 5pt 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">PTC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">是<SPAN lang=EN-US>Positive Temperature Coefficient </SPAN>的缩写<SPAN lang=EN-US>,</SPAN>意思是正的温度系数<SPAN lang=EN-US>,</SPAN>泛指正温度系数很大的半导体材料或元器件<SPAN lang=EN-US>.</SPAN>通常我们提到的<SPAN lang=EN-US>PTC</SPAN>是指正温度系数热敏电阻<SPAN lang=EN-US>,</SPAN>简称<SPAN lang=EN-US>PTC</SPAN>热敏电阻<SPAN lang=EN-US>. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></SPAN></P><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">PTC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">热敏电阻是一种典型具有温度敏感性的半导体电阻<SPAN lang=EN-US>,</SPAN>超过一定的温度<SPAN lang=EN-US>(</SPAN>居里温度<SPAN lang=EN-US>)</SPAN>时<SPAN lang=EN-US>, </SPAN>它的电阻值随着温度的升高呈阶跃性的增高<SPAN lang=EN-US>.<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">PTC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">热敏电阻根据其材质的不同分为<SPAN lang=EN-US>: </SPAN>陶瓷<SPAN lang=EN-US>PTC</SPAN>热敏电阻<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"> </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">有机高分子<SPAN lang=EN-US>PTC</SPAN>热敏电阻<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">PTC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">热敏电阻根据其用途的不同分为<SPAN lang=EN-US>: </SPAN>自动消磁用<SPAN lang=EN-US>PTC</SPAN>热敏电阻<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"> </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">延时启动用<SPAN lang=EN-US>PTC</SPAN>热敏电阻<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"> </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">恒温加热用<SPAN lang=EN-US>PTC</SPAN>热敏电阻<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"> </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">过流保护用<SPAN lang=EN-US>PTC</SPAN>热敏电阻<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"> </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">过热保护用<SPAN lang=EN-US>PTC</SPAN>热敏电阻<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"> </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">传 感 器用<SPAN lang=EN-US>PTC</SPAN>热敏电阻<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">一般情况下<SPAN lang=EN-US>,</SPAN>有机高分子<SPAN lang=EN-US>PTC</SPAN>热敏电阻适合过流保护用途<SPAN lang=EN-US>,</SPAN>陶瓷<SPAN lang=EN-US>PTC</SPAN>热敏电阻可适用于以上所列各种用途 。<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 5pt 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">恒温加热<SPAN lang=EN-US>PTC</SPAN>热敏电阻具有恒温发热特性<SPAN lang=EN-US>,</SPAN>其原理是<SPAN lang=EN-US>PTC</SPAN>热敏电阻加电后自热升温使阻值进入跃变区<SPAN lang=EN-US>,</SPAN>恒温加热<SPAN lang=EN-US>PTC</SPAN>热敏电阻表面温度将保持恒定值<SPAN lang=EN-US>,</SPAN>该温度只与<SPAN lang=EN-US>PTC</SPAN>热敏电阻的居里温度和外加电压有关<SPAN lang=EN-US>,</SPAN>而与环境温度基本无关<SPAN lang=EN-US>. <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">PTC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">加热元件就是利用恒温加热<SPAN lang=EN-US>PTC</SPAN>热敏电阻恒温发热特性设计的加热元件件<SPAN lang=EN-US>.</SPAN>在中小功率加热场合<SPAN lang=EN-US>, PTC</SPAN>加热元件具有恒温发热、无明火、热转换率高、受电源电压影响极小、自然寿命长等传统发热元件无法比拟的优势<SPAN lang=EN-US>, </SPAN>在电热器具中的应用越来越受到研发工程师的青睐<SPAN lang=EN-US>. <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">恒温加热<SPAN lang=EN-US>PTC</SPAN>热敏电阻可制作成多种外形结构和不同规格<SPAN lang=EN-US>,</SPAN>常见的有圆片形、长方形、长条形<SPAN lang=EN-US> </SPAN>、圆环以及蜂窝多孔状等<SPAN lang=EN-US>.</SPAN>把上述<SPAN lang=EN-US>PTC</SPAN>发热元件和金属构件进行组合可以形成各种形式的大功率<SPAN lang=EN-US>PTC</SPAN>加热元件<SPAN lang=EN-US>. <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">PTC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">加热元件按传导方式分<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">(1)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">以热传导为主的<SPAN lang=EN-US>PTC</SPAN>陶瓷加热元件<SPAN lang=EN-US>.</SPAN>其特点是通过<SPAN lang=EN-US>PTC</SPAN>发热元件表面安装的电极板<SPAN lang=EN-US>(</SPAN>导电兼传热<SPAN lang=EN-US>)</SPAN>绝缘层<SPAN lang=EN-US>(</SPAN>隔电兼传热<SPAN lang=EN-US>)</SPAN>导热蓄热板<SPAN lang=EN-US>(</SPAN>有的还附加有导热胶<SPAN lang=EN-US>)</SPAN>等多层传热结构<SPAN lang=EN-US>,</SPAN>把<SPAN lang=EN-US>PTC</SPAN>元件发出的热量传到被加热的物体上。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">(2)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">以所形成的热风进行对流式传热的各种<SPAN lang=EN-US>PTC</SPAN>陶瓷热风器<SPAN lang=EN-US>.</SPAN>其特点是输出功率大<SPAN lang=EN-US>,</SPAN>并能自动调节吹出风温和输出热量。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">(3)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">红外线辐射加热元件<SPAN lang=EN-US>.</SPAN>其特点实际利用<SPAN lang=EN-US>PTC</SPAN>元件或导热板表面迅速发出的热量直接或间接地激发接触其表面的远红外涂料或远红外材料使之辐射出红外线<SPAN lang=EN-US>,</SPAN>便构成了<SPAN lang=EN-US>PTC</SPAN>陶瓷红外辐射加热元件。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">PTC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">加热元件按结构特点分<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">(1)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">普通实用型<SPAN lang=EN-US>PTC</SPAN>陶瓷加热元件<SPAN lang=EN-US>.</SPAN>这类器具主要有<SPAN lang=EN-US>: </SPAN>电热蚊药驱蚊器、暖手器、干燥器、电热板、电烫斗、电烙铁、电热粘合器、卷发烫发器等<SPAN lang=EN-US>.</SPAN>其特点是功率不大，但热效率高很实用。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">(2)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">自动恒温型<SPAN lang=EN-US>PTC</SPAN>加热元件<SPAN lang=EN-US>.</SPAN>这类器具主要有：小型晶体器件恒温槽、恒温培养箱、电子保温瓶、<SPAN lang=EN-US> </SPAN>保温箱、保温杯、保温盘、保温柜、保温桌等。其特点是自动保温、结构简单、<SPAN lang=EN-US> </SPAN>恒温特性好、热效率高、使用环境温度范围宽。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">(3)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">热风<SPAN lang=EN-US>PTC</SPAN>加热元件<SPAN lang=EN-US>.</SPAN>这类热风<SPAN lang=EN-US>PTC</SPAN>加热元件主要有：小型温风取暖器、电吹风、暖房机、烘干机、干衣柜、干衣机、工业烘干设备等<SPAN lang=EN-US>. </SPAN>其特点是输出热风功率大、速热、安全、能自动调节风温和功耗。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.1pt; mso-char-indent-count: 2.0"><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">应用设计<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></B></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">利用恒温加热<SPAN lang=EN-US>PTC</SPAN>热敏电阻的恒温加热原理特性<SPAN lang=EN-US>,</SPAN>可以设计应用在直发器、发夹、发夹板、离子烫、烫发、烫发板、陶瓷烫发板、发钳、卷发器、电热梳、美发、负离子烫发器、美容美发、按摩器、蚊机、灭蚊器、驱蚊器、蚊香机、加香器、香水器、胶枪、热熔胶枪、洗脚加热、过胶机、保温、保温杯、煮水、开水器、咖啡 机、咖啡保温、咖啡加热元件、饮水机、冷热饮水机、热奶、热奶器、热水器、淋浴加热、电热蚊药驱蚊器、暖手器、干燥器、电热板、电烫斗、电烙铁、电热粘合器、卷发烫发器、淋浴器、暖风机、烘房、电暖炉、电暖器、冷暖空调、空调加热、取暖器、空气加热、烫壶、干鞋器、烘鞋器、暖脚板、电热板、频谱仪、频谱治 疗、理疗器、红外线加热、干衣机、摩托车化油器、电热加湿器、电器仪表防潮加热、小型晶体器件恒温槽、恒温培养箱、电子保温瓶、保温箱、保温杯、保温盘、保温柜、保温桌、电热盘、热疗仪、热咖啡器、蒸汽美容、熔蜡器、蒸汽发生器、增湿器、加湿器、巧克力挤出器、热宝、电烙铁、针灸、导尿管、暖手、暖脚器、 烘手器、棉花糖机、按摩器、液化气瓶加热、小型温风取暖器、电吹风、暖房机、烘干机、干衣柜、干衣机、工业烘干设备、火车机车电暖、模具加热、控制柜加热防潮、监视器防潮、电烘箱、电烤箱、输液宝、医疗设备、家用电器、日用电器、小家电<SPAN lang=EN-US>......</SPAN>等等。<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.1pt; mso-char-indent-count: 2.0"><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US style="BACKGROUND: white; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">PTC</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="BACKGROUND: white; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">热敏电阻主要参数</SPAN></B><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"> <o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">额定零功率电阻<SPAN lang=EN-US> R25<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">零功率电阻<SPAN lang=EN-US>,</SPAN>是指在某一温度下测量<SPAN lang=EN-US>PTC</SPAN>热敏电阻值时<SPAN lang=EN-US>,</SPAN>加在<SPAN lang=EN-US>PTC</SPAN>热敏电阻上的功耗极低<SPAN lang=EN-US>, </SPAN>低到因其功耗引起的<SPAN lang=EN-US>PTC</SPAN>热敏电阻的阻值变化可以忽略不计<SPAN lang=EN-US>. </SPAN>额定零功率电阻指环境温度<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="25" UnitName="℃"><SPAN lang=EN-US>25℃</SPAN></st1:chmetcnv>条件下测得的零功率电阻值<SPAN lang=EN-US>.<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">最小电阻<SPAN lang=EN-US> Rmin</SPAN>：指<SPAN lang=EN-US>PTC</SPAN>热敏电阻可以具有的最小的零功率电阻值<SPAN lang=EN-US>.<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">居里温度<SPAN lang=EN-US> Tc</SPAN>：对于<SPAN lang=EN-US>PTC</SPAN>热敏电阻的应用来说<SPAN lang=EN-US>,</SPAN>电阻值开始陡峭地增高时的温度是重要的<SPAN lang=EN-US>,</SPAN>我们将其定义为居里温度<SPAN lang=EN-US>.</SPAN>居里温度对应的<SPAN lang=EN-US>PTC</SPAN>热敏电阻的电阻<SPAN lang=EN-US> RTc = 2*Rmin.<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">温度系数<SPAN lang=EN-US> α</SPAN>：<SPAN lang=EN-US>PTC</SPAN>热敏电阻的温度系数定义为温度变化导致的电阻的相对变化<SPAN lang=EN-US>.</SPAN>温度系数越大<SPAN lang=EN-US>,PTC</SPAN>热敏电阻对温度变化的反应越灵敏<SPAN lang=EN-US>.<SPAN style="mso-spacerun: yes"> </SPAN>α = (lgR2-lgR1)/lge(T2-T1)<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">表面温度<SPAN lang=EN-US> Tsurf</SPAN>：表面温度<SPAN lang=EN-US>Tsurf</SPAN>是指当<SPAN lang=EN-US>PTC</SPAN>热敏电阻在规定的电压下并且与周围环境间处于热平衡状态已达较长时间时<SPAN lang=EN-US>,PTC</SPAN>热敏电阻表面的温度<SPAN lang=EN-US>.<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">动作电流<SPAN lang=EN-US> Ik</SPAN>：流过<SPAN lang=EN-US>PTC</SPAN>热敏电阻的电流<SPAN lang=EN-US>,</SPAN>足以使<SPAN lang=EN-US>PTC</SPAN>热敏电阻自热温升超过居里温度<SPAN lang=EN-US>,</SPAN>这样的电流称为动作电流<SPAN lang=EN-US>. </SPAN>动作电流的最小值称为最小动作电流<SPAN lang=EN-US>.<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">动作时间<SPAN lang=EN-US> ts</SPAN>：环境<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="25" UnitName="℃"><SPAN lang=EN-US>25℃</SPAN></st1:chmetcnv>条件下<SPAN lang=EN-US>,</SPAN>给<SPAN lang=EN-US>PTC</SPAN>热敏电阻加一个起始电流<SPAN lang=EN-US>(</SPAN>保证是动作电流<SPAN lang=EN-US>),</SPAN>通过<SPAN lang=EN-US>PTC</SPAN>热敏电阻的电流降低到起始电流的<SPAN lang=EN-US>50%</SPAN>时经历的时间就是动作时间<SPAN lang=EN-US>.<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">不动作电流<SPAN lang=EN-US> INk</SPAN>：流过<SPAN lang=EN-US>PTC</SPAN>热敏电阻的电流<SPAN lang=EN-US>,</SPAN>不足以使<SPAN lang=EN-US>PTC</SPAN>热敏电阻自热温升超过居里温度<SPAN lang=EN-US>,</SPAN>这样的电流称为不动作电流<SPAN lang=EN-US>. </SPAN>不动作电流的最大值称为最大不动作电流<SPAN lang=EN-US>.<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">最大电流<SPAN lang=EN-US> Imax</SPAN>：最大电流是指<SPAN lang=EN-US>PTC</SPAN>热敏电阻最高的电流承受能力<SPAN lang=EN-US>.</SPAN>超过最大电流时<SPAN lang=EN-US>PTC</SPAN>热敏电阻将会失效<SPAN lang=EN-US>.<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">残余电流<SPAN lang=EN-US> Ir</SPAN>：残余电流是在最大工作电压<SPAN lang=EN-US>Vmax</SPAN>下<SPAN lang=EN-US>,</SPAN>热平衡状态下的电流<SPAN lang=EN-US>.<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">最大工作电压<SPAN lang=EN-US> Vmax</SPAN>：最大工作电压是指在规定的环境温度下<SPAN lang=EN-US>,</SPAN>允许持续地保持在<SPAN lang=EN-US>PTC</SPAN>热敏电阻上最高的电压<SPAN lang=EN-US>.</SPAN>对同一产品而言<SPAN lang=EN-US>,</SPAN>环境温度越高<SPAN lang=EN-US>,</SPAN>最大工作电压值越低<SPAN lang=EN-US>.<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">额定电压<SPAN lang=EN-US> VN</SPAN>：额定电压是在最大工作电压<SPAN lang=EN-US>Vmax</SPAN>以下的供电电压<SPAN lang=EN-US>.</SPAN>通常<SPAN lang=EN-US> Vmax = VN + 15%<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">击穿电压<SPAN lang=EN-US> VD</SPAN>：击穿电压是指<SPAN lang=EN-US>PTC</SPAN>热敏电阻最高的电压承受能力<SPAN lang=EN-US>.PTC</SPAN>热敏电阻在击穿电压以上时将会击穿失效<SPAN lang=EN-US>.<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">PTC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">热敏电阻制造流程<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">将能够达到电气性能和热性能要求的混合物<SPAN lang=EN-US>(</SPAN>碳酸钡和二氧化钛以及其它的材料<SPAN lang=EN-US>)</SPAN>称量、混合、湿法研磨<SPAN lang=EN-US>,</SPAN>脱水干燥后干压成型制成圆片形、长方形、圆环形、蜂窝状的毛坯<SPAN lang=EN-US>.</SPAN>这些压制好的毛坯在较高的温度下<SPAN lang=EN-US>(<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="1400" UnitName="℃">1400℃</st1:chmetcnv></SPAN>左右<SPAN lang=EN-US>)</SPAN>烧结成陶瓷<SPAN lang=EN-US>,</SPAN>然后上电极使其金属化<SPAN lang=EN-US>,</SPAN>根据其电阻值分档检测<SPAN lang=EN-US>. </SPAN>按照成品的结构形式钎焊封装或装配外壳<SPAN lang=EN-US>,</SPAN>之后进行最后的全面测量<SPAN lang=EN-US>.<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><SPAN style="mso-tab-count: 1"> </SPAN><SPAN style="mso-spacerun: yes"> </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">称量<SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>?<SPAN style="mso-spacerun: yes"> </SPAN></SPAN>球磨<SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>?<SPAN style="mso-spacerun: yes"> </SPAN></SPAN>预烧结<SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>?<SPAN style="mso-spacerun: yes"> </SPAN></SPAN>造粒<SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><SPAN style="mso-tab-count: 1"> </SPAN><SPAN style="mso-spacerun: yes"> </SPAN>?<SPAN style="mso-spacerun: yes"> </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">成型<SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>?<SPAN style="mso-spacerun: yes"> </SPAN></SPAN>烧结<SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>?<SPAN style="mso-spacerun: yes"> </SPAN></SPAN>上电极<SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>?<SPAN style="mso-spacerun: yes"> </SPAN></SPAN>阻值分选<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><SPAN style="mso-tab-count: 1"> </SPAN><SPAN style="mso-spacerun: yes"> </SPAN>?<SPAN style="mso-spacerun: yes"> </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">钎焊<SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>?<SPAN style="mso-spacerun: yes"> </SPAN></SPAN>封装装配<SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>?<SPAN style="mso-spacerun: yes"> </SPAN></SPAN>打标志<SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>?<SPAN style="mso-spacerun: yes"> </SPAN></SPAN>耐压检测<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><SPAN style="mso-tab-count: 1"> </SPAN>? <SPAN style="mso-spacerun: yes"> </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">阻值检测<SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>?<SPAN style="mso-spacerun: yes"> </SPAN></SPAN>最终检测<SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>?<SPAN style="mso-spacerun: yes"> </SPAN></SPAN>包装<SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>?<SPAN style="mso-spacerun: yes"> </SPAN></SPAN>入库<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
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