What is the role of the relay, what is the working principle of the relay
The relay usually refers to the electromagnetic relay. The function of the relay is to control the on-off of another loop through one loop, and the two loops are generally isolated during this control process. This article introduces you to what is the role of the relay, and what is the working principle of the relay.
What is the role of the relay
The role of the intermediate relay: it is to play the role of conversion and transmission of control signals, essentially speaking, the intermediate relay is a kind of voltage relay, with the characteristics of a large number of contacts. The contact can withstand a large current and the action is more sensitive.
The function of voltage relay: From the perspective of the name, it can be roughly understood that its main principle is that it needs to work according to the voltage signal, and the actual contact action is determined according to the magnitude of the coil voltage. When the voltage relay is installed and used The coil needs to be connected in parallel with the load. The voltage relay can be divided into AC and DC according to the coil voltage, and can be divided into overvoltage and undervoltage according to the operating voltage. Therefore, their functions will be different. The overvoltage means that when the coil voltage is within the rated value, the armature will not make any pull-in action. On the contrary, if the coil voltage is exceeded, it will execute the action.
The function of the current relay: It usually needs to work according to the current signal, and also determines the contact action according to the current of the coil. The current relay coil needs to be connected in series with the load circuit when installed and used. According to the coil current, it can be divided into AC and DC. According to the action current, it can be divided into overcurrent and undercurrent.
What is the working principle of the relay
The relay has a normally open contact and a normally closed contact. The moving contact of a DC relay is a common terminal, that is, when the coil of the relay passes direct current, the coil with an iron core will output the corresponding magnetic field to adsorb the armature, and the moving contact One side will run from the normally closed contact to the normally open contact, which is equivalent to the normally open contact being closed. The coil of the start/stop button relay forms a control loop. As long as this loop is closed, the coil will have current through it and generate a magnetic field.
There is another light bulb’s control power supply that forms a loop. When the normally open contact is closed, the current will flow through the bulb from the positive end of the control power supply, through the closed normally open contact, and then back to the negative pole. , So the bulb will glow.
When the start/stop button is disconnected, the coil will lose current, so that the armature will be reset through the spring without the magnetic attraction, so that the other end of the movable contact will return from the normally open contact to the normally closed contact. , The energization circuit of the bulb is forcibly disconnected, and the bulb will naturally dim without current.
This article focuses on what is the role of the relay, and what is the working principle of the relay. It can be seen that the role of the relay is very obvious, whether it is in daily life or industrial production, relays can be widely used, the fundamental reason is that the relay can solve many practical problems.
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