Where can the relay be used?
Relay is always used in the circuit, such as car relay is actually ordinary DC relay, it can also be used in other DC circuit inside. It is actually the essence of the switch, but the electromagnetic switch, and its coil power will produce a magnetic force will be connected in series inside the circuit pull, breaking the electromagnetic force disappeared, contact disconnected. So you can achieve automatic control.
The relay is a device that can be turned on and off for another circuit (high voltage, high current) by turning off the current (voltage and current) in its coil. It is possible to use normally open type (coil is not energized When the contact is closed, the circuit is not conducting, the power contact is closed) or normally closed type (coil is not energized when the contact is closed, the circuit conduction, power contact that is broken), the product is generally used for air conditioning, , Communications and other fields, the car has more relays, such as: car glass is the use of relay control, when the need to rise or fall, press the corresponding button to the coil power, the contact closure, loop conduction , To achieve the control of the glass movements. I have a little understanding of this stuff, not clear even though asked me, ha ha
Relay function and usage:
(1) to expand the control range: For example, multi-contact relay control signal to a certain value, you can press the contact group of different forms, while switching, breaking, connected to multiple circuits.
(2) enlargement: 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 prescribed form, the comparison is performed to achieve a predetermined control effect.
(4) Automatic, remote control, monitoring: For example, the relay on the automatic device together with other electrical appliances, can be programmed to control the line, in order to achieve automated operation.
The relay is in the absence of current in the case of no magnetic, power after the resumption of magnetic. AC current when the exchange of magnetic.
