描述

單向可控硅是一種可控整流電子元件，能在外部控制信號作用下由關(guān)斷變?yōu)閷?dǎo)通，但一旦導(dǎo)通，外部信號就無法使其關(guān)斷，只能靠去除負載或降低其兩端電壓使其關(guān)斷。單向可控硅是由三個PN結(jié)PNPN組成的四層三端半導(dǎo)體器件，與具有一個PN結(jié)的二極管相比，單向可控硅正向?qū)ㄊ芸刂茦O電流控制；與具有兩個PN結(jié)的三極管相比，差別在于可控硅對控制極電流沒有放大作用。雙向可控硅具有兩個方向輪流導(dǎo)通、關(guān)斷的特性。雙向可控硅實質(zhì)上是兩個反并聯(lián)的單向可控硅，是由NPNPN五層半導(dǎo)體形成四個PN結(jié)構(gòu)成、有三個電極的半導(dǎo)體器件。由于主電極的構(gòu)造是對稱的（都從N層引出），所以它的電極不像單向可控硅那樣分別叫陽極和陰極，而是把與控制極相近的叫做第一電極A1，另一個叫做第二電極A2。雙向可控硅的主要缺點是承受電壓上升率的能力較低。這是因為雙向可控硅在一個方向?qū)ńY(jié)束時，硅片在各層中的載流子還沒有回到截止狀態(tài)的位置，必須采取相應(yīng)的保護措施。雙向可控硅元件主要用于交流控制電路，如溫度控制、燈光控制、防爆交流開關(guān)以及直流電機調(diào)速和換向等電路?？煽毓柙诰S持電流以上一直處于開通狀態(tài)，關(guān)斷電流高，控制困難，關(guān)斷速度較慢。逆變環(huán)節(jié)中，在LCI（負載換相逆變器）中SCR具有優(yōu)異表現(xiàn)，可做到超大功率，電壓高、電流也大。二極管（Diode，不可控整流器件）和SCR（半可控）整流均不需要PMW即可滿足兩象限變頻器工作，PWM需要用IGBT（全控）等器件。

Unidirectional thyristor is a controllable rectifier electronic component that can change from off to on under the action of external control signals. However, once on, the external signal cannot turn it off and can only be turned off by removing the load or reducing the voltage at both ends. Unidirectional thyristor is a four layer three terminal semiconductor device composed of three PN junctions PNPN. Compared with diodes with one PN junction, the forward conduction of unidirectional thyristor is controlled by the control pole current; Compared with a transistor with two PN junctions, the difference is that the thyristor has no amplification effect on the control electrode current. Bidirectional thyristor has the characteristic of conducting and turning off alternately in two directions. Bidirectional thyristors are essentially two anti parallel unidirectional thyristors, which are semiconductor devices composed of four PN structures formed by NPNPN five layer semiconductors and have three electrodes. Due to the symmetrical structure of the main electrode (all led out from the N layer), its electrodes are not referred to as anodes and cathodes respectively like unidirectional thyristors. Instead, the electrode that is similar to the control electrode is called the first electrode A1, and the other is called the second electrode A2. The main drawback of bidirectional thyristor is its low ability to withstand voltage rise rate. This is because when the bidirectional thyristor completes conduction in one direction, the charge carriers in each layer of the silicon wafer have not yet returned to the cut-off state, and corresponding protective measures must be taken. Bidirectional thyristor components are mainly used in AC control circuits, such as temperature control, lighting control, explosion-proof AC switches, and DC motor speed regulation and commutation circuits. The thyristor is always in an open state above the maintenance current, with high turning off current, difficult control, and slow turning off speed. In the inverter stage, SCR has excellent performance in LCI (Load Commutated Inverter), which can achieve ultra high power, high voltage, and high current. Diode (uncontrollable rectifier) and SCR (semi controllable) rectifiers do not require PMW to meet the operation of two quadrant inverters, while PWM requires devices such as IGBT (fully controlled).

專業(yè)銷售世界各大電氣品牌產(chǎn)品產(chǎn)品海外直接采購，正品庫存，價格優(yōu)惠售后保修，型號齊全，一樣的產(chǎn)品，不一樣的價格與服務(wù)。大量供應(yīng)原裝進口DCS系統(tǒng)配件，PLC系統(tǒng)配件。主營:ABB、GE發(fā)那科、Bentl本特利、Triconex英維思、Woodward伍德沃德、Foxboro?？怂共_、Westinghouse西屋/Emerson艾默生、Reliance瑞恩、SchneiderModicon施耐德莫迪康、A-B、HIMA黑馬、Motorola摩托羅拉、Kollmorgen科爾摩根Bosch/Rexroth/博世力上樂，NI,YOKOGAWA橫河，等各大品牌的DCS系統(tǒng)配件，機器人系統(tǒng)配件，大型伺服系統(tǒng)停產(chǎn)備件。

ABB PU412 3BSE056479R1 RTA板通訊盒MB300

ABB PU519 3BSE01 8681R1 RTA板.

ABB PU518 3BSE018680R1 RTA板

PU517 ABB PCB板卡3BSC980050R46

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PU516 3BSE013064R1 ABB模塊

ABB PU514A 3BSE013062R1板卡PU514

ABB PU513v2 PC板卡3BSE013034R1 PU513v2

ABB PU512V1 RTA板卡3BSE004736R1 C2750-66601

ABB PU512v2 3BUR001401R1 電路板PU512v1

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ABB PPC905AE101 3BHE014070R0101 PC板PPC905

ABB PPC902AE101 3BHE010751R0101電路板模塊

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ABB PROCESS PANEL 245 PP245 3BSC690103R1過程面板顯示屏

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PP877 K 3BSE069272R2 ABB觸摸屏控制面板PP877K

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PP836A ABB Panel 800 3BSE042237R2控制面板觸摸屏

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公司介紹：
成都陽光不斷創(chuàng)新致力于提升停產(chǎn)的自動化零件供應(yīng)水平，無論客戶身處何地，無論所需配件多么稀有，我們總能將客戶與所需產(chǎn)品緊密連接 ，成都陽光零部件覆蓋廣泛。
急切需要自動化或控制零件？ 全新、Used和已停產(chǎn)的自動化機械零件的全球供應(yīng)商。
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Company Introduction:
Chengdu Sunshine Xihe Co., Ltd. specializes in one-stop procurement consulting for imported industrial spare parts, offering original equipment and professional discontinued parts services. We are committed to providing efficient and reliable automation solutions for our customers. Customer support fast responseThe network of partners spans all continentsGlobal partner networkAlways achieve more delivery, be it parts, service or speed



始終實現(xiàn)更多的交付，無論是零件、服務(wù)還是速度