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產(chǎn)品簡介
DM-150 Reliance Electric (* ̄︶ ̄)
DM-150 Reliance Electric (* ̄︶ ̄)
產(chǎn)品價格:¥2200
上架日期:2017-10-18 15:42:26
產(chǎn)地:美國
發(fā)貨地:廈門
供應數(shù)量:不限
最少起訂:1個
瀏覽量:301
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    產(chǎn)品名稱:DM-150 Reliance Electric DCS 系統(tǒng)模塊

    產(chǎn)品型號:DM-150 Reliance Electric

    產(chǎn)品參數(shù):DM-150 Reliance Electric

    產(chǎn)品功能:DM-150 Reliance Electric

    1概述
    光耦(opticalcoupler)亦稱光電隔絕器、光耦合器或光電耦合器。它是以光為前言來傳輸電信號的器件,一般把發(fā)光器(紅外線發(fā)光二極管LED)與受光器(光敏半導體管)封裝在同一管殼內(nèi)。當輸入端加電信號時發(fā)光二極管宣告光線,光敏三極管接受光線之后就發(fā)作光電流,從輸出端流出,然后完結了“電—光—電”變換。典型運用電路如下圖1-1所示。
    光耦的首要利益是:信號單向傳輸,輸入端與輸出端完全完結了前端與負載完全的電氣隔絕,輸出信號對輸入端無影響,減小電路攪擾,簡化電路規(guī)劃,作業(yè)安穩(wěn),無觸點,運用壽命長,傳輸效率高。光耦合器是70年代發(fā)展起來的新型器件,現(xiàn)已廣泛用于電氣絕緣、電平變換、級間耦合、驅動電路、開關電路、斬波器、多諧振蕩器、信號隔絕、級間隔絕、脈沖擴展電路、數(shù)字外表、遠距離信號傳輸、脈沖擴展、固態(tài)繼電器(SSR)、儀器外表、通訊設備及微機接口中。在單片開關電源中,運用線性光耦合器可構成光耦反響電路,經(jīng)過調(diào)度控制端電流來改動占空比,抵達精密穩(wěn)壓目的。
    2光耦典型電路
    常用于反響的光耦類型有TLP521、PC817等。這兒以TLP521為例,介紹這類光耦的特性。圖2-1所示為光耦內(nèi)部結構圖以及引腳圖。
    TLP521的原邊相當于一個發(fā)光二極管,原邊電流If越大,光強越強,副邊三極管的電流Ic越大。副邊三極管電流Ic與原邊二極管電流If的比值稱為光耦的電流擴展系數(shù),該系數(shù)隨溫度改動而改動,且受溫度影響較大。作反運用的光耦正是運用“原邊電流改動將導致副邊電流改動”來完結反響,因而在環(huán)境溫度改動劇烈的場合,因為擴展系數(shù)的溫漂比較大,應盡量不經(jīng)過光耦完結反響。此外,運用這類光耦有必要留心規(guī)劃外圍參數(shù),使其作業(yè)在比較寬的線性帶內(nèi),否則電路對工作參數(shù)的敏感度太強,不利于電路的安穩(wěn)作業(yè)。
    一般選擇TL431結合TLP521進行反響。這時,TL431的作業(yè)原理相當于一個內(nèi)部基準為2.5 V的電壓過失擴展器(輸出的電壓進行過失擴展比較,然后將取樣電壓經(jīng)過光電偶合器反響控制脈寬占空比,抵達安穩(wěn)電壓的目的),所以在其1腳與3腳之間,要接補償網(wǎng)絡。
    TL431是由德州儀器出產(chǎn)的可控精密穩(wěn)壓源,什物如圖2-3所示。它的輸出電壓用兩個電阻就可以恣意的設置到從2.5V到36V范圍內(nèi)的任何值。該器件的典型動態(tài)阻抗為0.2Ω,在許多運用中用它代替穩(wěn)壓二極管,例如,數(shù)字電壓表,運放電路,可調(diào)壓電源,開關電源等。圖2-2所示為TL431引腳擺放與運用連線圖。
    常見的光耦反響第1種接法。Vo為輸出電壓,Vd為芯片的供電電壓。com信號接芯片的過失擴展器輸出腳。留心左邊的地為輸出電壓地,右邊的地為芯片供電電壓地,兩者之間用光耦隔絕。圖2-3所示接法的作業(yè)原理如下:當輸出電壓升高時,TL431的1腳(相當于電壓過失擴展器的反向輸入端)電壓上升,3腳(相當于電壓過失擴展器的輸出腳) 電壓下降,光耦TLP521的原邊電流If增大,光耦的另一端輸出電流Ic增大,電阻R4上的電壓降增大,com引腳電壓下降,占空比減小,輸出電壓減??;反之,當輸出電壓下降時,調(diào)度進程類似。
    高于反相端電位的方式,運用運放的一種特性—當運放輸出電流過大(超越運放電流輸出才干)時,運放的輸出電壓值將下降,輸出電流越大,輸出電壓下降越多。因而,選用這種接法的電路,一定要把PWM(脈沖寬度調(diào)制)芯片的過失擴展器的兩個輸入引腳接到固定電位上,且有必要是同向端電位高于反向端電位,使過失擴展器初始輸出電壓為高。圖2-3所示接法的作業(yè)原理是:當輸出電壓升高時,原邊電流If增大,輸出電流Ic增大,因為Ic現(xiàn)已超越了電壓過失擴展器的電流輸出才干,com腳電壓下降,占空比減小,輸出電壓減??;反之,當輸出電壓下降時,調(diào)度進程類似。
    常見的第3種接法,如圖2-4所示。與第一種底子類似,不同之處在于多了一個電阻R6,該電阻的作用是對TL431額外注入一個電流,避免TL431因注入電流過小而不能正常作業(yè)。實際上如恰當選取電阻值R3,電阻R6可以省掉。調(diào)度進程底子上同1接法一起。
    常見的第4種接法,如圖2-4所示。該接法與第2種接法類似,差異在于com端與光耦第4腳之間多接了一個電阻R4,其作用與第3種接法中的R6一起,其作業(yè)原理底子同接法2。
    反響方法1、3適用于任何占空比(接通時間與周期之比)情況,而反響方法2、4比較適合于在占空比比較小的場合運用。
    3、小結

    開關電源的光耦首要是隔絕、供應反響信號和開關作用。開關電源電路中光耦的電源是從高頻變壓器次級電壓供應的,當輸出電壓低于穩(wěn)壓管電壓是給信號光耦接通,加大占空比,使得輸出電壓升高;反之則關斷光耦減小占空比,使得輸出電壓下降。旦高頻變壓器次級負載超載或開關電路有毛病,就沒有光耦電源供應,光耦就控制著開關電路不能起振,然后保護開關管不至被擊穿焚毀。



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    Fischer & Porter PLC Rack Model 40PF2000A

    Fischer Porter 50LV Flow Meter NEW

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    Fischer Porter 50EW1020BA
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    Vortex flow meter, Bailey Fischer & Porter, 2 inch

    Fischer & Porter Flow Meter Pre Amp 55GE228

    FISCHER & PORTER 686B613U01 USPP 686B613U01

    Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P41

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    Fischer + Porter 53MC5212A25BA Controller 53MC5

    FISCHER & PORTER 686B617U01 USPP 686B617U01

    Fischer Porter 10E1205 Bull's Eye Sight Flow 820B002U18

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    Fischer Porter 1340 Electronic uDCI Chart Recorder

    Fischer & Porter FET AI MUX Board 685B731U02

    Fischer Porter 10E1207 1" Iron Bull's Eye Sight Flow

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    Fischer Porter 390 Chart/Graph Recorder

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    Fischer Porter Ultrasonic Generator 55UC2210A

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    FISCHER & PORTER 50-PZ-1211 FLOWMETER SIGNAL CONVERTER

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    Fischer & Porter Co. Module 338D147U01

    Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P51

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    FISCHER & PORTER 10A1755 FLOWMETER 0-110 GPH LIQUID

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    Fischer & Porter MAG X Model 10D1419A Flowmeter S32

    FISCHER PORTER R18805B2077/22B1 MAG. FLOWTUBE, USED

    Fischer & Porter - 40PB200 - Digital Output Card

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    Fischer and Porter Variable Area Flowmeter 10A1377M LOT

    FISCHER AND PORTER RATIO SIGHT FLOW 10A2235A (NIB)

    Fischer & Porter Flow Meter Tube 443U381U09

    Fischer & Porter Flow Meter Tube 443U381U10

    Fischer & Porter Flow Meter Tube 443U381U11

    Fischer & Porter Flow Meter Tube 443U381U12

    Fischer & Porter Flow Meter Tube 443U381U13

    Fischer & Porter Flow Meter Tube 443U381U18

    Fischer & Porter Flow Meter Tube FP-1/8-13.3-G-6

    Bailey Fischer Porter Fluid Level Indicator 10E1205A

    FISCHER & PORTER 55-AD-1212A USPP 55AD1212A

    Fischer & Porter 10A6130 Flow Meter 10A6100 Rotameter

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    Fischer & Porter Flow Meter 3" Service Clamp

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    FISCHER & PORTER FLOWRATE INDICATOR 801J057 UNUSED

    Assorted Fischer Porter Glassware

    FISCHER PORTER A31351G 0-2.5 FLOW METER W/ SKINNER

    FISCHER PORTER 1" DOSAGE METER 611B091U02 USED

    FISCHER & PORTER JACKETED DISTILLING VIGREUX COLUMN

    FISCHER & PORTER LAB DISTILLING VIGREUX COLUMN 480 mm

    NEW FISCHER PORTER PROCESS ALARM RELAY B55PA2000B

    NOS Bailey Fischer Porter 10A6130 Flow Meter 250 PSIG

    FISCHER & PORTER CHLOROMATIC VALVE STEPPING MOTOR

    FISCHER & PORTER LOSS OF VACUUM SWITCH CHLORINE

    FISCHER & PORTER VACUUM BREAKER CHLORINE

    FISCHER & PORTER DUAL IN ALARM CIRCUIT BOARD CHLORINE

    1" NPT Fischer & Porter Pressure Relief Valve 71P2412A
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    Fischer & Porter 10A1450 Flow Meter 150 PSIG Max

    Fischer & Porter 10A1450N Flow Meter 150 PSIG Max

    FISCHER & PORTER DS247510 FNFP DS247510

    FISCHER & PORTER F1-2108 NSFP F12108

    FISCHER & PORTER F1-4068 NSFP F14068

    Fischer & Porter Flow Meter 2" Service Clamp

    FISCHER PORTER HYDRAULIC FLOW METER 10A3555

    Fischer & Porter Flow Meter 1-1/2" Service Clamp

    FISCHER & PORTER DRAIN VALVE ASSEMBLY EJECTOR CHLORINE

    NOS FISCHER PORTER FLOW METER GUAGE 10A6130 250PSIG

    Fischer & Porter Flowmeter # l0A6l30

    FISCHER PORTER 10A3135M 8312A03461A1

    FISCHER PORTER 10A3135 8203A0622A1

    Fischer & Porter Flow Meter 1-1/4" Service Clamp

    FISCHER & PORTER EJECTOR PLUG ASSEMBLY CHLORINE

    FISCHER + PORTER " GLASS METERING VALVES "

    (qty 2) Fischer & Porter flow meter housing 10A1336

    Fischer & Porter Flow Meter 1" Service Clamp

    FISCHER & PORTER S/S FLOWMETER OVH 20" #5903A2333B1 46A

    Fischer and Porter Variable Area Flowmeter 10A1347N23B

    FISCHER & PORTER FLOWMETER 1-25 TUBE 02-F 1/8-25-5/70

    FP FISCHER & PORTER 1A01755 AIR GUAGE


    Four used Fischer & Porter Flow Meters

    ABB Fischer Porter 1/2" FNPT Flow Meter & Controller

    Lot 24 Fischer-Porter 141D005U01 Chart Recorder Strip





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