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Relay is an automatic switch element with isolation fun […]
Relay is an automatic switch element with isolation function, which is widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronic equipment.
Generally, relays have induction mechanism (input part) which can reflect certain input variables (such as current, voltage, power, impedance, frequency, temperature, pressure, speed, light, etc.); there are actuators (output parts) that can realize "on" and "off" control of controlled circuit; there are coupling isolation between input part and output part of relay Function processing and intermediate mechanism (driving part) for driving the output part.
As a control element, the relay has the following functions:
(1) Expand the control range: for example, when the control signal of multi-contact relay reaches a certain value, the multi-channel circuit can be changed, disconnected and connected according to different forms of contact groups.
(2) Amplification: for example, sensitive relay, intermediate relay, with a very small amount of control, can control a high power circuit.
(3) Integrated signal: for example, when multiple control signals are input into multi winding relay according to the specified form, the predetermined control effect is achieved through comparative synthesis.
(4) Automatic, remote control, monitoring: for example, the relay on the automatic device, together with other electrical appliances, can form a program control circuit to realize automatic operation