英语翻译ThyristorsHowever,asspecifiedinthethyristordatasheets,thethyristorcurrentreversesitselfbeforebecomingzero.Theimportantparameterisnotthetimeittakesforthecurrenttobecomezerofromitsnegativevalue,butratherthe-保卡通问答

英语翻译ThyristorsHowever,asspecifiedinthethyristordatasheets,thethyristorcurrentreversesitselfbeforebecomingzero.Theimportantparameterisnotthetimeittakesforthecurrenttobecomezerofromitsnegativevalue,butratherthe

更新时间： 2025-08-19 08:59:32

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英语翻译

Thyristors

However,asspecifiedinthethyristordatasheets,thethyristorcurrentreversesitselfbeforebecomingzero.Theimportantparameterisnotthetimeittakesforthecurrenttobecomezerofromitsnegativevalue,butrathertheturn-offtimeintervaltqfromthezerocrossoverofthecurrenttothezerocrossoverofthevoltageacrossthethyristor.Duringtqareversevoltagemustbemaintainedacrossthethyristorandonlyafterthistimeisthedevicecapableofblockingaforwardvoltagewithoutgoingintoitson-state.2Ifaforwardvoltageisappliedtothethyristorbeforethisintervalhaspassed,thedevicemayprematurelyturnonanddamagetothedeviceandcircuitcouldresult.Thyristordatasheetsspecifytqwithaspecifiedreversevoltageappliedduringthisintervalaswellasaspecifiedrate-of-riseofvoltagebeyondthisinterval.Thisintervaltqissometimescalledthecircuit-commutated-recoverytimeofthethyristor.

Dependingontheapplicationrequirements,varioustypesofthyristorareavailable.Inadditiontovoltageandcurrentratings,turn-offtimetq,andtheforwardvoltagedrop,othercharacteristicsthatmustbeconsideredincludetherate-of-riseofthecurrent(di/dt)atturn-onandtherate-of-riseofvoltage(du/dt)atturn-off.

1.Phhase-controlthyristors.Sometimestermedconverterthyristors,theseareusedprimarilyforrectifyingline-frequencyvoltageandcurrentinapplicationssuchasphase-controlledrectifiersfordcandacmotordrivesandinhigh-voltagedcpowertransmission.Themaindevicerequirementsarelargevoltageandcurrenthandlingcapabilitiesandalowon-statevoltagedrop.Thistypeofthyristorhasbeenproducedinwaferdiametersofupto10cm,wheretheaveragecurrentisabout4000Awithblockingvoltagesof7kV.

2.Inverter-gradethyristors.Thesearedesignedtohavesmallturn-offtimestqinadditiontolowon-statevoltages,althoughon-statevoltagesarelargerindeviceswithshortervaluesoftq.Thesedevicesareavailablewithratingsupto2500Vand1500A.Theirturn-offtimesareusuallyintherangeofafewmicrosecondsto100μsdependingontheirblockingvoltageratingsandon-statevoltagedrops.

3.Light-activatedthyristors.Thesecanbet

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　　然而,在指定的晶闸管数据表,晶闸管电流逆转本身之前成为零.重要的参数是不需要的时间为当前成为零从负价值,而是关断的时间间隔从零交叉形成的电流的零交叉点上的电压晶闸管.在天晴的反向电压必须保持在晶闸管,正是在这之后,能够阻挡正向电压没有进入状态.2如果一个电压应用到晶闸管这间隔时间结束之前,设备可能过早地打开和损害可能导致设备和电路.晶闸管数据表显示出与特定的反向电压在这段期间以及一个指定的电压差超出这一区间.本区间形成有时被称为circuit-commutated-recovery时间的晶闸管.根据不同的应用要求,各类晶闸管可用.除了额定电压和电流关断时间,质量,和正向电压降,其他特点,必须考虑包括差的电流（电流变化率）在开启和利率的上升电压（杜电压）在关断.1.phhase-control晶闸管.有时被称为变换器的晶闸管,这些主要用于工频电压和电流整流等应用相控整流器的直流和交流电机驱动器和高压直流输电.主要设备要求大电压和电流处理能力和低导通压降.这种类型的晶闸管是在晶圆的直径可达10厘米,那里的平均电流约4000一5~阻断电压7kV.2.inverter-grade晶闸管.这些设计有小质量关断时间,除了低导通电压的导通电压,虽然较大设备较短的价值观的形成.这些器件可与收视率高达2500V、1500.其关闭时间的范围通常在几微秒的100μ取决于其阻断电压等级和导通电压下降.3.光控晶闸管.这些可以被触发的脉冲光的指导光学纤维特别敏感地区的晶闸管.激活触发晶闸管使用的能力,适当波长的光产生多余的电子空穴对在硅.主要利用这些晶闸管高压等应用高压直流输电在多晶闸管串联连接,组成一个转换阀.光控晶闸管已报告和评级4kv期,导通电压约2,和光触发功率要求的5兆瓦.