继电器是利用电信号或脉冲可以开启或关闭的一种开关。 例如,如果你想用单片机打开或关闭一个LED,你可以直接将LED连接到单片机的IO管脚(带限流电阻),然后发送一个信号给,嗯,打开或关闭LED。

但是如果你想用单片机打开或关闭一个10瓦电源的LED灯泡怎么办? LED直接连接到单片机的IO管脚,因为它是一个极小的器件,电压和电流需要最小(适合单片机)。

电源供电的10W LED灯泡不能以同样的方式使用。 它首先是由电源供电的。 第二个问题是10W对于单片机来说有点太高了,即使它是一个直流电源的灯泡。 继电器在这样的情况下很有用。

如前所述,高电压、高电流的设备可以用继电器控制,通常由微控制器控制(如前面提到的电源LED灯泡)。

如果你曾经从事过DIY项目(无论是房子还是汽车)的话,你很可能会遇到Relays。 虽然还有其他继电器类型,用于各种场合,但电磁继电器是最常见的。

继电器种类
继电器种类繁多,例如:
电磁继电器
锁存继电器
电子继电器
非锁定继电器
里德继电器
高压继电器
小信号继电器
延时继电器
多维继电器
热继电器
差动继电器
距离继电器
汽车继电器
频率继电器
极化继电器
旋转继电器
顺序继电器
移动线圈继电器
布赫霍尔茨继电器
安全继电器
监督继电器
接地故障继电器
锁存继电器
闩锁继电器是在激活后继续工作的继电器。 由于这个原因,这些继电器也被称为脉冲继电器、保持继电器或保持继电器。 锁存继电器在需要控制功耗和耗电的场合工作得最好。

锁存继电器内置磁铁。 内部磁铁保持接触位置时,线圈被给予电流,因此它不需要任何动力来保持这个位置。 因此,即使在触点触发后,切断对线圈的驱动电流也不会导致线圈从原来的位置移动。 因此,这些继电器节省了大量的能量。

一个或两个线圈锁存继电器可用,这些线圈控制继电器电枢的位置。 如图所示,闩锁继电器没有默认位置。

线圈内的电流流动方向在单线圈继电器中决定电枢的位置,但在双线圈继电器中,电流流动的线圈决定电枢的位置。 一旦启动,这些继电器能够保持他们的位置,但控制电路决定他们将重置到何处。

簧片继电器
簧片继电器产生物理接触的机械激活以打开或关闭电路通道,就像机电继电器一样。 然而,这些继电器连接比电磁继电器小得多,质量也小。

这些继电器是用绕簧片开关的线圈构造的。 继电器的电枢,即所谓的簧片开关,是由充满惰性气体的玻璃管或胶囊制成,有两个重叠的簧片(或铁磁叶片)密封在里面。

簧片的重叠两端由可能连接到输入和输出端子的触点组成。

极化继电器
这些继电器,顾名思义,对驱动它们的电流方向极为敏感。 它是一种特殊的直流电磁继电器,具有第二种永磁源来移动电枢。 这些继电器有一个电枢 、 电磁铁和永久磁铁用于其磁路.

这些继电器使用磁力来拉动或推动电枢以代替弹簧力。 在这种情况下,电磁铁形成极面,而永磁铁作为电枢。 电流通过电磁铁时产生磁通。

布赫霍尔茨继电器
它们是气体驱动或气体操作的继电器。 这些继电器用于发现正在发展的问题(或内部故障,这些内部故障最初是小故障,但到适当的时候就会变成大故障)。 它们被放置在变压器储罐与保护器之间的空间中,最常用于变压器保护。 这些专用于油浸继电器,主要用于配电和输电系统。

过载保护继电器
过载保护继电器是专门用来保护电动机和电路免受过电流影响的。这些过载继电器有多种设计,包括固定双金属带式、电子式和可更换双金属加热器等。

当电动机工作过度时,电动机需要过电流保护。 为此使用了过载检测设备,例如热操作的继电器。 热继电器中的线圈加热双金属带或焊盘,熔化它,并释放弹簧,以控制与线圈串联的辅助触点。 感应过载导致负载过大的电流使线圈断电。

固态继电器
开关过程由固态继电器进行,使用BJT、晶闸管、IGBT、MOSFET和TRIAC。 由于(为控制电路供电)所需的控制能量大大低于(通过开关输出)调节的功率,这些继电器的功率增益远大于机电继电器。 这些继电器可以同时使用交流和直流电源。

由于没有机械连接,这些继电器具有快速切换速度的特点。 一个SSR由一个传感器组成,一个电子元件也是,它响应控制信号来开启或关闭负载的电源。

反定最小时间继电器(IDMT继电器)
在较大的故障电流电平下,这种继电器产生确定的时间电流特性,在较低的故障电流电平下产生逆时间电流特性。 它们能够对当前和时间设置设置限制,并经常用于保护配电线路。

在这种继电器中,继电器的运行时间与接近拾取值的故障电流大致成反比关系,并且稳定在拾取值以上。 这可以通过利用磁铁芯来实现,磁铁芯对于比拾音器电流稍高的电流饱和。

差动继电器
差动继电器,顾名思义,是基于调节(或驱动)脉冲的”差”而运行的继电器。 当两个或多个可比电值的相位差达到特定阈值时,差动继电器被激活。 比较进出受保护的系统的电流的幅度和相位差决定了电流差动继电器的工作原理。

继电器不能工作,因为在典型的工况下,进出的电流幅度和相位是相同的。 然而,如果系统出现缺陷,这些电流的大小和相位将不再相等。 这种继电器的连接确保了电流输入和电流输出之间的差别。

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