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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。
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。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，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，輸出電壓減小；反之，當輸出電壓下降時，調度進程類似。
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，輸出電壓減小；反之，當輸出電壓下降時，調度進程類似。
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
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Fischer Porter 10A3130 Purge Meter Rotameter 3135-P64A
Fischer Porter 10A3130 Purge Meter Rotameter 3135-P69A
Fischer + Porter 53MC5212A25BA Controller 53MC5
FISCHER & PORTER 686B617U01 USPP 686B617U01
Fischer Porter 10E1205 Bull's Eye Sight Flow 820B002U18
FISCHER & PORTER 805H028U02 USPP 805H028U02
Fischer Porter 1340 Electronic uDCI Chart Recorder
Fischer & Porter FET AI MUX Board 685B731U02
Fischer Porter 10E1207 1" Iron Bull's Eye Sight Flow
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P20
Fischer Porter 10A3130 Purge Meter Rotameter 3135-P20 B
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P21
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P22
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P23
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P24
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P24
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P25
Fischer Porter 10A3130 Purge Meter Rotameter 3135-P25 B
Fischer Porter 10A3130 Purge Meter Rotameter 3135-P25 C
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P26
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P28
Fischer Porter 10A3130 Purge Meter Rotameter 3135-P28 B
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P32
Bailey Fischer Porter Flow Meter Model 10A2227A LOT
Fischer & Porter Flowmeter 10A2235 w/ 1-3/4" ports
BAILEY FISCHER PORTER CHART RECORDER 3 PEN 2345
Fischer Porter 390 Chart/Graph Recorder
Fischer Porter Ultrasonic Generator
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P12
Fischer Porter 50AS3212 (Flowmeter Signal Converter??)
Fischer Porter 10E1207 1/2" Iron Bull's Eye Sight Flow
FISCHER & PORTER 686B372U01 USPP 686B372U01
Fischer Porter Ultrasonic Generator 55UC2210A
FISCHER PORTER/ABB FLOMETER 0-3 GPM
FISCHER PORTER/ABB FLOMETER 0-0.6 GPM
FISCHER & PORTER 10A6131N NSPP 10A6131N
FISCHER & PORTER 10A6130 NSPP 10A6130
FISCHER & PORTER 50-PZ-1211 FLOWMETER SIGNAL CONVERTER
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P10
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P11
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P13
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P14
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P15
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P16
Fischer Porter 10A3130 Purge Meter Rotameter 3135-P16 B
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P17
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P18
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P19
FISCHER & PORTER 10A6131NA1BXX NSPP 10A6131NA1BXX
FISCHER & PORTER 10A6131NB1B *NEW*
One-day shipping available
Fischer & Porter Co. Module 338D147U01
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P51
Fischer & Porter 10A3130 Purge Meter Rotameter 3135-P54
Fischer & Porter 10A3130 Purge Meter Rotameter A313512
Fischer Porter 10A3130 Purge Meter Rotameter 3135-P51A
Fischer Porter 10A3130 Purge Meter Rotameter 3135-P52A
Fischer Porter 10A3130 Purge Meter Rotameter 3135-P54A
Fischer Porter 10A3130 Purge Meter Rotameter 821A013U03
NEW FISCHER PORTER 300F257U03 GLASS METERING TUBE
Fischer Porter 10A6130 Flow Meter 250 PSIG Max
One-day shipping available
FISCHER & PORTER 10A6130 USPP 10A6130
Fischer Porter V. A Meter
Fischer Porter 53MC4211A1BB1 Digital Controller 53MC4
FISCHER & PORTER 685B606U01 USPP 685B606U01
FISCHER & PORTER 699B265U03 NSFP 699B265U03
Fischer And Porter 10A1755 Flowmeter USED Free Ship
One-day shipping available
NEW FISCHER & PORTER FORCE MOTOR PART # 669B009U07
FISCHER & PORTER 19AXA1DBS2D1B1M1X 1/4" FLOW METER
Fischer & Porter Co. FP Series Variable Area Flowmeter
One-day shipping available
Fischer Porter 17CA1010 Chlorine Detector Chloralert
FISCHER & PORTER ABB 10A500 Flowmeter 10L/Min, 1" 316SS
FISCHER & PORTER 10A1755 FLOWMETER 0-110 GPH LIQUID
Fischer & Porter Flow Meter Float Stop 304D069P31
FISCHER AND PORTER FLOW METER D10A6142N 0 TO 30
Fischer & Porter Force Motor 669B009U07
Fischer Porter FPLC Glass Columns? Lab Glass, Glassware
Fischer & Porter 53ML1000 Manual Loading Station NEW!
FISCHER & PORTER VERT ARATOR 500
One-day shipping available
Fischer Porter Flow Meter New 10A2235A Ratosight
Fischer & Porter Loop Board 40PB2011
Fischer Porter Vert Arator 500 mod.no.SA182F316 B2847
Fischer & Porter Flow Meter 8" Service Clamp
FISCHER & PORTER MOD 10A2227A SCALE
Expedited shipping available
FISCHER & PORTER RATO SIGHT METER 1/2" NPT GPM 614ER22
FISCHER & PORTER 609B431U08 NSFP 609B431U08
FISCHER PORTER 10D1419A MAG X FLOW TUBE, USED
Fischer & Porter MAG X Model 10D1419A Flowmeter S32
FISCHER PORTER R18805B2077/22B1 MAG. FLOWTUBE, USED
Fischer & Porter - 40PB200 - Digital Output Card
Lot 6 Fischer Porter/Brooks Flow Meter
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
Fischer & Porter Flow Meter Tube 443U410U09
Fischer & Porter Flow Meter Tube 443U410U10
Fischer & Porter Flow Meter Tube 448B017U01
Fischer & Porter Flow Meter Tube FP-1/4-20-P-3/37
Fischer & Porter Flow Meter 3" Service Clamp
FISCHER PORTER METERING TUBES FLOWMETERS LOT 3 NEW!
fischer@porter mdl 50dpp111-3-rvv ae-aaa
fischer@porter mdl 500dpf 110-3-bus
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
Expedited shipping available
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
