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1. 发明授权

US5021634A Temperature controlled soldering iron employing a variable resistance heating element for temperature sensing 失效
标题翻译：温控烙铁采用可变电阻加热元件进行温度检测
公开(公告)号：US5021634A
公开(公告)日：1991-06-04
申请号：US229328
申请日：1988-07-05
申请人： Giovanni Santoro , Emmanno Francolini
发明人： Giovanni Santoro , Emmanno Francolini
IPC分类号： B23K3/03 , G05D23/24
CPC分类号： G05D23/2401 , B23K3/033
摘要： A temperature controlled soldering iron with a heating element having a positive temperature coefficient arranged as one leg of a Wheatstone resistance bridge such that the voltage across the heating element signals the temperature of the soldering iron. A comparator is connected across opposite nodes of the bridge and turns off a switching element to cut current flow through the bridge when the heating element is above the desired temperature. A pulse generator continuously supplies pulses to briefly restart current flow through the bridge and allow the temperature to be sensed. The pulses are short duration and occur regardless of whether the comparator has previously turned off current flow, and independent of the temperature of the heating element. After each pulse the comparator controls current flow by leaving the flow on or turning it off according to the temperature of the heating element as measured by comparison of the voltages on the opposite nodes of the bridge.
摘要翻译： PCT No.PCT / IT87 / 00091 Sec。 371日期：1988年7月5日 102（e）日期1988年7月5日PCT提交1987年11月4日PCT公布。出版物WO88 / 03455 日期：1988年5月19日。一种具有正温度系数的加热元件的温度控制烙铁布置为惠斯通电阻桥的一条腿，使得加热元件两端的电压表示烙铁的温度。比较器连接在桥的相对节点上，当加热元件高于所需温度时，关闭开关元件以切断通过桥的电流。脉冲发生器连续地提供脉冲以短暂地重新启动通过桥的电流，并允许感测温度。脉冲持续时间短，无论比较器先前是否关闭电流，并且与加热元件的温度无关。在每个脉冲之后，比较器根据加热元件的温度，通过将流量关闭或关闭来控制电流，比较桥的相对节点上的电压。

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