Core Tip: The relay is an automatic switching element with isolation function. It is widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronics. It is one of the most important control components.
It is understood that relays generally have an induction mechanism (input part) that can reflect certain input variables (such as current, voltage, power, impedance, frequency, temperature, pressure, speed, light, etc.); The actuator (output portion) of the "off" control; between the input portion and the output portion of the relay, there is also an intermediate mechanism (drive portion) that couples the input amount, functionally processes, and drives the output portion.
As a control element, in summary, the relay has the following effects:
1) Expand the scope of control. For example, when the multi-contact relay control signal reaches a certain value, it can switch, disconnect, and turn on multiple circuits at the same time according to different forms of the contact group.
2) Zoom in. For example, sensitive relays, intermediate relays, etc., can control very high power circuits with a very small amount of control.
3) Integrated signal. For example, when a plurality of control signals are input to a multi-winding relay in a prescribed form, the comparison is integrated to achieve a predetermined control effect.
4) Automatic, remote control, monitoring. For example, a relay on an automated device, together with other appliances, can form a program control circuit for automated operation.
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Label: The role of the relay
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