YFFB扁电缆电为啥要分交流、直流?
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江苏春晨电缆有限公司生产YFFB扁电缆电为啥要分交流、直流?继电器的应用,相信大家都知道,在电路中只要给它供电、断电也就可以工作了。然而,它的应用细节,不知道大家有没注意。下面谈谈我的观点Theapplicationoftherelay,Ibelieveeveryoneknows,inthecircuitaslongasitgivesitpowersupply,powerfailurecanwork.However,itisnotawareofthedetailsofitsapplication.Let'stalkaboutmypointofview一、现在流行的接法,如图。Apopularconnection,suchasapicture.图中,继电器的线圈经过Q1作为开关,使其导通与断开。D1作为续流,消耗线圈中的能量。Inthediagram,thecoiloftherelaypassesthroughtheQ1asaswitchtomakeitopenanddisconnect.D1,asacontinuousflow,c***umestheenergyinthecoil.二、继电器的特点;Two,thecharacteristicsoftherelay;1、吸合电流大于释放电流1.Theabsorptioncurrentisgreaterthanthereleasecurrent2、保持电流小于吸合电流、大于释放电流。2,thecurrentislessthantheabsorptioncurrentandgreaterthanthereleasecurrent.以上两点均为继电器的“通病”,大家可以做一下实验,或看一看说明书。Theabovetwopointsarethe"commondisease"oftherelay.Youcandotheexperiment,orlookattheinstructi***.三、流行电路的优点及缺点Three.Theadvantagesanddisadvantagesofthepopularcircuit大家知道,继电器的线圈相当于电感,它的电流不能突变。在释放时,Q1截止瞬间,线圈将仍保持原来的电流大小,如果不接入D1这个二极管,产生的电压-----理论上是无穷大的(在外电路负载为无穷大时),流行电路中的D1的接入,给线圈中的能量提供了释放的通道。Asyouknow,thecoilofarelayisequivalenttoaninductor,anditscurrentcannotbemutated.Intherelease,Q1bythemoment,willstillmaintainthecurrentsizeoftheoriginalcoil,ifyoudonotaccessD1thediode,thevoltagegenerated,istheoreticallyinfinite(intheexternalcircuitloadisinfinite),accesspopularincircuitD1,providesachanneltoreleasetheenergyinthecoil.然而,假如(理论上)二极管为理想的,即它只单向导通而没有任何功率消耗,那么,在继电器释放时,线圈中的电流将一直保持吸合时的较大电流(同时假如线圈为理想的),这种情况将使继电器无法释放。However,if(theoretically)diodeisideal,itisonlyaone-wayconductionwithoutanypowerc***umption,so,whentherelayisreleased,thecurrentinthecoilwillremainlargerwhen(andifthecurrentpickupcoilisideal),thissituationwillcausetherelaycannotbereleased.实际中的二极管及线圈都不是理想的,所以,它是可以释放的。继电器的吸合到释放是由线圈中的电流决定的,如果二极管及线圈的等效电阻(直流)很小,那么它的释放时间将很长,反之,则较短。Theactualdiodesandcoilsarenotideal,soitcanbereleased.Theattachmentoftherelaytothereleaseisdeterminedbythecurrentinthecoil.Iftheequivalentresistance(DC)ofthediodeandthecoilisvery***all,thereleasetimewillbeverylong,otherwise,itwillbeshorter.由此看,流行电路的优点是提供了Q1截止时的能量释放通道;其缺点是,释放时间还有进一步缩短的可能。Asaresult,theadvantageofthepopularcircuitistoprovidetheQ1cut-offenergyreleasechannel;itsdisadvantageisthatthereleasetimemaybefurthershortened.四、其它接法。Four.Otherconnecti***.曾见过象下图中电路,也曾见过象下图中没有二极管的接法,这些接法都考虑到了***开关Q1截止时的反向电压,但没有考虑到释放时间问题。YFFB扁电缆电为啥要分交流、直流?Ih***eseenthatthecircuitinthefollowingpicturehasalsoseentheconnectionofdiodeswithoutthediodeinthefollowingpicture.AllthesemethodstakeintoaccountthesuppressionofthereversevoltagewhentheswitchQ1isoff,butthetimeofreleaseisnotc***idered.五、建议接法。Five.1、加入电阻R1,使能量释放快一些。1,theresistanceR1isaddedtomaketheenergyreleasefaster.上图中,线圈在Q1关断时,能量主要消耗在R1上,使继电器可以快速降到释放电流。Intheabovepicture,whenthecoilisturnedoffatQ1,theenergyismainlyc***umedontheR1,sothattherelaycanquicklydroptothereleasecurrent.R1的选择,由Q1的较高反压、线圈工作电流两者决定,电阻越大,释放时间越短。----计算就不说了吧。ThechoiceofR1isdeterminedbyboththehighreversevoltageofQ1andtheworkingcurrentofthecoil.Thegreatertheresistance,theshorterthereleasetime.Thecalculationwillnotbesaid.2、减小继电器保持时的功耗。YFFB扁电缆电为啥要分交流、直流?2,reducethepowerc***umptionoftherelay.大家知道,继电器吸合时需要较大的电流,而保持吸合状态则不需要和吸合时的电流一样。Itisknownthattherelayneedsalargercurrentwhentherelayissucking,whilemaintainingtheabsorptionstatedoesnotrequirethesamecurrentasthesuction.下图接入R1及C1将明显减小继电器的保持功耗。在继电器吸合前,C1已充电至供电电压,吸合的瞬间将由C1为TheaccesstoR1andC1belowwillsignificantlyreducethemaintenanceoftherelay.Beforetherelayisabsorbed,theC1hasbeenchargedtothepowersupplyvoltage,andthemomentoftheabsorptionwillbeC1.继电器供电,以保障吸合所需的大电流。当吸合后,供给线圈的电流来自R1,它将电流限制到较小状态Therelayispoweredtoensurethehighcurrentrequiredtoabsorb.Whenitisabsorbed,thecurrentofthesupplycoilcomesfromR1,whichlimitsthecurrenttoa***allerstate.)
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