First, the principle of Tyco relay
When the input quantity (such as voltage, current, temperature, etc.) reaches the specified value, so that the output circuit to be controlled by the conductive or open electrical appliances. Can be divided into electrical quantity (such as current, voltage, frequency, power, etc.) relay and non-electrical quantity (such as temperature, pressure, speed, etc.) relay two categories. It has the advantages of fast action, stable work, long service life, small size and so on. Widely used in power protection, automation, motion, remote control, measurement and communication devices.
1, the working principle and characteristics of electromagnetic relays
Electromagnetic relays are generally composed of iron cores, coils, armatures, contact reeds and so on. As long as the coil ends plus a certain voltage, the coil will flow through a certain current, thus generating an electromagnetic effect, the armature will be attracted to the role of electromagnetic force to overcome the return of the spring tension suction to the iron core, thus driving the armature's moving contacts and static contacts (normally open contacts) suction. When the coil is disconnected, the electromagnetic suction also disappears, the armature will be in the spring reaction force to return to the original position, so that the dynamic contacts and the original static contacts (normally closed contacts) release. This suction, release, so as to achieve the purpose of conduction in the circuit, cut off.
For the relay "normally open, normally closed" contacts, can be distinguished in this way: the relay coil is not energized in the disconnected state of the static contacts, known as "normally open contacts"; in the on state of the static contacts known as "normally closed contacts". "normally closed contacts".
2, the working principle and characteristics of the thermal reed relay
Thermal reed relay is a new type of thermal switch that uses heat-sensitive magnetic material to detect and control temperature. It consists of a temperature-sensitive magnetic ring, a constant magnetic ring, a reed switch, a thermally conductive mounting piece, a plastic backing and some other accessories. The thermal reed relay does not use coil excitation, but the magnetic force generated by the constant magnetic ring to drive the switch action. Whether the constant magnetic ring can provide magnetic force to the reed switch is determined by the temperature control characteristics of the temperature-sensitive magnetic ring.
3, solid state relay (ssr) principle of operation and characteristics
Solid state relay is a two-terminal for the input, the other two terminals for the output of the four-terminal device, the middle of the use of isolation devices to achieve the input and output of the electrical isolation.
Solid state relays can be divided into AC and DC types according to the type of load power. According to the switch type can be divided into normally open and normally closed type. According to the isolation type can be divided into hybrid, transformer isolation type and photoelectric isolation type, to photoelectric isolation type for the most.
4, reed relay
Reed relay is a coil to generate a magnetic field will be reed actuated relay, for a coil sensing device. Therefore, the characteristics of reed relay, small size, light weight, fast response time, short beat time and other characteristics. When a piece of ferromagnetic metal or other magnetically conductive material is in close proximity to a reed relay, it will act to open or close a circuit. Composed of permanent magnets and reed switches. Permanent magnet, reed switch fixed in a non-conductive and non-magnetic bracket. To the permanent magnet of the north and south poles of the line as the axis, this axis should be coincident with the reed switch axis or basic coincidence.
Adjust the distance between the permanent magnet and the reed switch from far to near, and fix the position of the magnet when the reed switch just happens to be in action (for a normally open reed switch, it becomes closed; for a normally closed reed switch, it becomes disconnected). At this time, when there is a whole piece of magnetic material, such as iron plate close to the magnet and the reed switch at the same time, the reed switch will once again act, back to the state when there is no magnetic field; when the iron plate away, the reed switch that is the opposite direction of action. Reed relay structure is strong, the contacts are sealed state, high durability, can be used as a mechanical equipment position limit switch, can also be used to detect whether the iron door, window, etc. in the specified position.
5, optical relay
Optical relay for ac/dc and semiconductor relays, refers to the integration of light-emitting devices and light-emitting devices. The input and output sides are electrically insulated, but the signal can be transmitted through the optical signal.
Characterized by a semi-permanent life, small current drive signal, high impedance insulation voltage, ultra-small, optical transmission, no contact ... etc.. Mainly used in measurement equipment, communication equipment, security equipment, medical equipment...etc..
The above is an example of the relay market is relatively more advantageous and reputation quality products, that is, the Tyco relay related aspects of the professional knowledge of the basics of the introduction, which can be learned as a well-known brand, its advantages are very obvious, that is, the mature quality assurance, perfect after-sales service, which allows consumers to use the Tyco relay to achieve the current control and safety protection effect. Control and safety effects, in addition, we can be detailed according to the size specifications for detailed classification, I believe that friends interested in understanding can take this opportunity to harvest people satisfied with the product.