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              繼電器分類之固態繼電器

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

              固態繼電器SSR是一種全部由電子器件組成的新型無觸點開關器件,它利用電子元件(如開關三極管、雙向可控硅等半導體器件)的開關特性,達到無觸點,無火花的接通和斷開電路的目的。采用光電耦合器實現輸入輸出之間的電氣隔離。

              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、三相交流固體繼電器。它集三只單相交流固態繼電器為一體,以兩個輸入控制端對三相負載,進行直接開關切換,可方便地控制三相電機、加熱器等三相負荷。
              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、單相固體繼電器。它有兩個輸入控制端,兩個輸出端。輸入端加上直流或者脈沖信號到一定電流值后,輸出端就從斷態轉為通態。
              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.
              三相普通型SSR是以三只雙向可控硅作為三相的輸出開關觸點,三相增強型是以三組反并聯單向可控硅作為三相開關輸出觸點。電容性負載、感性負載宜選用增強型。
              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.
              繼電器
              relay
              根據使用場合又分為過零觸發和隨機導通型。其中過零觸發型應用較多,相當于開關,射頻干擾小。隨機導通型,移相觸發,多用于調節電壓,有干擾。
              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.
              固態繼電器它有以下特點:它可以用微弱的控制信號對幾十安至幾百安電流的負載實施無觸點的通斷?,F已擴展到電磁繼電器無法應用的場合,如計算機終端接口,程控裝置,腐蝕潮濕環境及某些防爆場所等。不足之處有導通壓降,漏電流大,交直流通用性差,耐溫及過載能力差。使用過程中應注意以下問題。
              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合理選擇額定電流,必須留有足夠的余量。純電阻負載可按大于等于負載電流的2倍選用,對于冷阻性負載(冷光鹵鎢燈,電感性,電容性負載及沖擊大的負載,可按負載額定電流的5~7倍選用。
              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固態繼電器的發熱與散熱,由于其導通有壓降,會產生熱量。10A以上的固態繼電器底板與散熱器安裝面涂抹導墊硅脂,輸出電流大時用風扇冷卻。
              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固態繼電器的過流。實際運行中負載短路極易造成繼電器損壞,過流保護可選用快速熔斷器或快速型斷路器一般按額定電流的1.5倍選取。
              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固態繼電器“觸點”斷開時存在一定的漏電流,使輸出回路不能真正斷電,注意檢修安全。
              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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