ABB  3BHL000986P0006 继电器电容器 它具有控制系统（输入回路）和被控制系统（输出回路）

• 继电器内部结构
• 继电器工作原理
• 继电器应用
  • 入门
  • 进阶
• 这样控制方式的好处
• 继电器使用时注意事项
• 毕设答辩常见问题
  • 1、为什么要在继电器线圈上并联一个二极管呢？
  • 2、并联的二极管为什么选择开关速度快的？
  • 3、电磁继电器和固态继电器（SSR）有什么区别啊？
  • 4、不加三极管，直接用单片机的IO提供继电器线圈的电流可以吗？
  • 5、继电器使用单片机的高电平触发好呢还是低电平触发好呢？

电磁继电器（electromagnetic relay）是一种电子控制器件，它具有控制系统（输入回路）和被控制系统（输出回路），通常应用于自动控制电路中，它是用较小的电流、较低的电压去控制较大电流、较高的电压的一种开关控制方式，在电路中起着自动调节、安全保护、转换电路等作用，并且能够实现遥控和生产自动化。
通常称之为，弱电控制强电。

Internal structure of relay
Working principle of relay
Relay application
Getting Started
Advanced 
The benefits of this control method
Precautions for using relays
Frequently asked questions about graduation defense
1. Why parallel a diode on the relay coil?
2. Why do parallel diodes choose fast switching speeds?
3. What is the difference between electromagnetic relays and solid-state relays (SSRs)?
4. Is it possible to directly use the IO of the microcontroller to provide the current of the relay coil without adding a transistor?
5. Is it better to use the high level trigger of a microcontroller for relays or the low level trigger?
Electromagnetic relay is an electronic control device that has a control system (input circuit) and a controlled system (output circuit). It is usually used in automatic control circuits. It is a switch control method that uses smaller currents and lower voltages to control larger currents and higher voltages. It plays a role in automatic regulation, safety protection, and conversion circuits in the circuit, And it can achieve remote control and production automation.
Usually referred to as weak current controlling strong current.