# 电磁式继电器的工作原理 - PowerPoint PPT Presentation

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K. K. 电磁式继电器的工作原理. 一、结构和符号. 衔铁. 触点. 线圈. 支杆. 铁心. 轭铁. 触点焊片. 线圈焊片. 是用较小的电流控制较大电流的自动开关. 通电后. 通电前. 通电前. 通电后. 二、工作原理. 动合 ( 常开 ) 触点. 动断 ( 常闭 ) 触点. 常闭、常开是指未通电之前的状态. . +V CC. . . . K. ~ 220V. S. R B. C. 三、使用举例. K. 续流二极管作用： 在三极管从 导通变截止时导通，将继电器 线圈的感应电动势限制为一个

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K

K

+VCC

K

~ 220V

S

RB

C

K

PN结压降，使三极管UCEVCC，

• 驱动电路要能够给继电器线圈提供额定的工作电压和电流。

2. 继电器触点容量要满足负载的最大电流和电压要求。