relay_open():创建一个Relay通道,包括创建每个CPU对应的ReIay缓冲区。 relay-close():关闭一个Relay通道,包括释放所有的ReIay缓冲区,在此之前会调用 relay-switch()来处理这些ReIay缓冲区以保证己读取但是未满的数据不会丢失。 relay_write():将数据写入到当前CPU对应的Relay缓冲区内。由于它使用了local_irqsave(...
2.2 名词解释 A relay is an electrically operated switch that uses an electromagnet to open or close any electrical circuit. In other words, We can say that A Relay is an electromechanical switch that has the ability to turn ON or OFF any electrical circuit. It consists of a flexible movin...
自己绘制原理图 当L293D_1Y输出高电平5V时,三极管未导通,此时电磁铁断电,继电器的COM端与CLOSE引脚相连,J81端子没有电压输出,连接负载,负载不工作; 当L293D_1Y输出低电平0V时,三极管导通,此时电磁铁通电,继电器的COM端与OPEN引脚相连,J81端子有12V电压输出,连接负载,负载工作; 所以我们只要设计一个电路,让单片机...
Open close type iron core AC leakage current monitoring relay Three phase and single phase AC leakage current monitoring relay Three phase power supply overvoltage, undervoltage and unbalanced monitoring relay Three-phase power supply phase sequence and phase lacking monitoring relay Temperature moni...
当L293D_1Y输出高电平5V时,三极管未导通,此时电磁铁断电,继电器的COM端与CLOSE引脚相连,J81端子没有电压输出,连接负载,负载不工作; 当L293D_1Y输出低电平0V时,三极管导通,此时电磁铁通电,继电器的COM端与OPEN引脚相连,J81端子有12V电压输出,连接负载,负载工作; ...
触点操作: 铁芯的移动会导致机械部分的运动,最终使触点(开关)发生动作。继电器通常有常开(Normally Open,NO)和常闭(Normally Closed,NC)两组触点。 常闭触点: 在继电器未通电时处于闭合状态,当电磁线圈通电时,触点打开。 常开触点: 在继电器未通电时处于打开状态,当电磁线圈通电时,触点闭合。
The utility model discloses a relay judging the unbalanced faults and system vibration of a circuit in relay protection, comprising a forming circuit for electricity parameters, a sequence filter device for positive, negative and zero sequence currents, a rectifying circuit, a synthesizer, filtering ...
An "ordinary" relay closes its contacts the instant the coil is energized (within a ms. or two). Time delay relays may be time delay close (tdc) or time delay open (tdo). A tdc relay closes its contacts a set time after the coil is energized; a tdo relay opens its contacts a set...
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NC即常闭端(normal close); COM即公共端(common); NO即常开端(normal open) 用的比较经常的时NO、COM组合(有时候也用NC,COM组合) NO和COM谁接入负载(比如led灯、小风扇)的正极,谁接。。 负载的正极记为LoadP(ostive),负极记为LoadN(egative); ...