, the working principle of relay and characteristic 　
Relay is parts of an apparatus of control of a kind of electron, it has control system (call an input loop again) and controlled system (say to output loop again) , apply in automata circuit normally, it is to use lesser electric current to go to a kind controlling bigger electric current actually " recloser " . Reason is having the effect such as self-adjusting, safe protection, change-over circuit in circuit.
1, the working principle of electromagnetism relay and character
Electromagnetism type relay is general wait for composition by reed of core, coil, armature, contact. Want the tension with in coil two end are added constant only, constant electric current can have flowed in coil, produce electromagnetism effect thereby, the pulling force that return spring overcomes below the action that armature can draw in electromagnetism force sucks Xiang Tiexin, drive armature thereby use contact and fixed contact (often open contact) suck close. After coil cuts off the power, electromagnetic attraction also disappears subsequently, armature can return former position in the counterforce of bedspring, make use contact and original fixed contact (often close contact) suck close. Such suction close, release, achieved thereby guide mediumly in circuit, the purpose that cut off. To relay " often leave, often shut " contact, such OK coming that distinguish: Coil was not in relay when electrify disconnect the fixed contact of condition, call " often open contact " ; Be in put through the fixed contact of condition is called " often close contact " .
2, the working principle of relay of heat quick dry spring and character
Relay of heat quick dry spring is a kind of new-style heat that uses heat quick magnetism to material detects and control temperature quick switch. It is installed by annulus of feeling lukewarm magnetism, constant magnetism annulus, canal striking spring, heat conduction piece, a few accessory comprise plastic underlay etc. Heat quick does reed relay need not coil excitation, and the action of switch of magnetic force drive that produces by constant magnetism annulus. Constant magnetism annulus whether providing magnetic force to canal striking spring is by annulus of feeling lukewarm magnetism lukewarm those who control characteristic decision.
3, solid state relay (SSR) working principle and character
Solid state relay is a kind two terminal are carried for the input, additional the 4 upright parts of an apparatus or appliance that two terminal carry for output, segregation is used among implementation of parts of an apparatus is input-output electric segregation.
Solid state relay can be divided by type of laden power source for communication model with straight flow pattern. Can divide by switch type to often leave model and often shut model. By segregation type can be divided to mix model, transformer segregation keep apart with photoelectricity model, keep apart with photoelectricity model for at most
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