Relay is a kind of control equipment commonly used in our life. In a popular sense, it is a switch, which is closed or opened when the conditions are met. The switching characteristics of relays are widely used in many control systems, especially in discrete control systems.
1、 Relay is a kind of control equipment commonly used in our life. In a popular sense, it is a switch, which is closed or opened when the conditions are met. The switching characteristics of relays are widely used in many control systems, especially in discrete control systems.
From another point of view, because the electronic circuit designed for a certain purpose needs to intersect with some mechanical equipment more or less, so the relay also plays the role of interface between electronic equipment and mechanical equipment. The relay commonly used in control is usually used for relay control, signal transmission, isolation amplification and other purposes.
In addition, there are current relay to limit current, voltage relay to control voltage, automotive relay, electromagnetic voltage relay, small relay, power relay, home appliance relay, etc. It is with these different types of relays that we can control different physical quantities and complete a complete control system.
2、 Function of relay
Expand the control range: for example, when the control signal of multi-contact relay reaches a certain value, the multi-channel circuit can be switched on, disconnected and connected at the same time according to different forms of contact group.
2. Amplification: for example, sensitive relay, intermediate relay, etc., with a very small amount of control, you can control a circuit of great power.
3. Integrated signal: for example, when multiple control signals are input into multi winding relay in the specified form, the predetermined control effect can be achieved through comparative integration.
4. Automatic, remote control and monitoring: for example, the relay on the automatic device, together with other electrical appliances, can form a program control circuit to realize automatic operation.
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