The role and construction of the relay
Is to follow the input signal changes, dial or disconnect the small current circuit, to achieve automatic control is to protect the electrical power of the device!
"Relay" is also a kind of electric door, but unlike the general switch, the relay is not mechanically controlled, but is a kind of electric force to control the switching direction of the door. When the coil is energized, the center of the soft iron core will produce magnetic, the lateral swing arm to absorb, and the right side of the arm is forced to contact the door contact, so that the formation of two contacts.
Simple single-axis single-cut relay, a relay can also switch multiple sets of electrical doors, a dual-axis double-cut relay, it has eight pins, arranged in the figure on the figure number. In addition to the relay specifications in addition to the number of different electrical contacts, but also pay attention to the coil voltage is DC or AC, the use of voltage and current size, switching voltage withstand voltage, relay specifications are 6v, 9v, 12v, 24v, 48v , Such as the general industry commonly used relay contacts can withstand voltage and current 110vac-10a, the coil voltage is 24vdc, a total of two or three groups of contacts. Low-voltage DC relay can be directly driven by the use of crystal, the use of extremely convenient.
General relay specifications it does not explain how much current relay can drive the coil, the use of the coil can measure the resistance value, you can use Ohm law conversion current consumption, if we measure the resistance of 150w, the coil Drive voltage 24vdc, the current consumption of 24v / 150w = 0.16a, so you can know the power supply needs to supply much of the current in order to make the relay action.
Relays are very important and common electronic components, and are useful in many mechanical controls.
The relay is an automatic switching element with isolation function, which is widely used in remote control, telemetry, communication, automatic control, electromechanical integration and power electronic equipment, is one of the most important control components.
(Such as current, voltage, power, impedance, frequency, temperature, pressure, speed, light, etc.) of the sensing mechanism (input part); can control the circuit to achieve the " (Output section) between the input portion and the output portion of the relay, and an intermediate mechanism (driving section) for coupling and isolating the input amount, the function processing and driving the output portion, The
.... As a control element, summed up, the relay has the following effects:
..... 1) to expand the scope of control. For example, the multi-contact relay control signal to a certain value, you can press the contact group in different forms, while switching, breaking, connected to multiple circuits.
..... 2) zoom in. For example, sensitive relays, intermediate relays, etc., with a very small amount of control, you can control the power of the circuit.
..... 3) Integrated signal. For example, when a plurality of control signals are input into a multi-winding relay in a predetermined form, the control effect is achieved by comparison.
.... 4) automatic, remote control, monitoring. For example, the relay on the robotic device, along with other electrical appliances, can be programmed to control the line, enabling automated operation.
Factory specializing in the production of various types of time relay electromagnetic relay electronic relay high-power relay level relay solid-state relay high-power relay small relay timer counter relay.
