Relay working principle  (Dieselpartsworld) 2016-01-19     

Relay working principle
To know the relay working principle first to know
What is a relay
Relay is a kind of electronic control devices. It has control system (also known as the input circuit) and control system (also known as the output circuit), usually used in automatic control circuit, it is actually a smaller current to control the current of the larger a "automatic switch". In the circuit, automatic regulation, security protection, conversion circuit and so on.
Relay function:
1) to expand the scope of control.
For example, when the control signal of the multi contact relay reaches a certain value, the different forms of the contact group can be connected, and the switching and switching off and the multiple circuit are switched on.
2) amplification.
For example, a sensitive relay, intermediate relay, etc., with a very small amount of control, you can control a lot of power circuit.
3) integrated signal.
For example, when a plurality of control signals are input into a plurality of winding relays in a prescribed form, the control effect can be achieved through the comparison and synthesis.
4) automatic, remote control, monitoring.
For example, the relay on the automatic device can be composed of a program control circuit to achieve automatic operation.
In fact, the essence of the relay is a transmission signal of electrical appliances, which according to the input signal to achieve different control purposes.
Relay is generally used to connect and disconnect the electrical control (motor) such as in the DC motor current relay, when the current is too small or too large, it detects the current signal and control the motor start and stop.