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              來源:http://www.cekidots.com/ 日期:2021-10-09 發布人:tongjid


              Solid state relay SSR is a new type of contactless switching device composed of all electronic devices. It uses the switching characteristics of electronic components (such as switching triode, bidirectional thyristor and other semiconductor devices) to achieve the purpose of contactless and spark free switching on and off the circuit. Optocoupler is used to realize electrical isolation between input and output.
              1. Three phase AC solid state relay. It integrates three single-phase AC solid-state relays, directly switches the three-phase load with two input control terminals, and can easily control the three-phase load such as three-phase motor and heater.
              2. Single phase solid state relay. It has two input control terminals and two output terminals. After the input is added with DC or pulse signal to a certain current value, the output will change from off state to on state.
              The three-phase common SSR uses three bidirectional thyristors as the three-phase output switch contacts, and the three-phase enhanced SSR uses three groups of anti parallel unidirectional thyristors as the three-phase switch output contacts. Capacitive load and inductive load should be enhanced type.
              According to the application occasion, it is divided into zero crossing trigger and random conduction type. Among them, zero crossing trigger is widely used, which is equivalent to switch, and the RF interference is small. Random conduction type, phase-shifting trigger, mostly used to adjust voltage, with interference.
              Solid state relay has the following characteristics: it can use weak control signal to carry out contactless on-off for loads with tens of amps to hundreds of amps. It has been extended to the occasions where electromagnetic relay can not be applied, such as computer terminal interface, program-controlled device, corrosive and humid environment and some explosion-proof places. The disadvantages include conduction voltage drop, large leakage current, poor AC and DC universality, poor temperature resistance and overload capacity. Pay attention to the following problems during use.
              ① If the rated current is reasonably selected, sufficient margin must be reserved. Pure resistance load can be selected as more than or equal to 2 times of load current. For cold resistance load (cold light tungsten halogen lamp, inductive load, capacitive load and load with large impact, it can be selected as 5 ~ 7 times of load rated current.
              ② The heating and heat dissipation of solid-state relay will generate heat due to the voltage drop in its conduction. The base plate of solid-state relay above 10a and the mounting surface of radiator shall be coated with guide pad silicone grease. When the output current is large, it shall be cooled by fan.
              ③ Overcurrent of solid state relay. In actual operation, short circuit of load is very easy to cause relay damage. Quick fuse or quick circuit breaker can be selected for overcurrent protection, generally 1.5 times of rated current.
              ④ When the "contact" of solid-state relay is disconnected, there is a certain leakage current, so that the output circuit can not be really powered off. Pay attention to maintenance safety.

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