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DM-75 Reliance Electric (*￣︶￣)

来自：厦门兴锐嘉进出口有限公司

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发布时间：2017-10-18 关注次数：274

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产品名称：DM-75 Reliance Electric DCS 系统模块

产品型号：DM-75 Reliance Electric

产品参数：DM-75 Reliance Electric

产品功能：DM-75 Reliance Electric

1概述

光耦(opticalcoupler)亦称光电隔绝器、光耦合器或光电耦合器。它是以光为前言来传输电信号的器件，一般把发光器(红外线发光二极管LED)与受光器(光敏半导体管)封装在同一管壳内。当输入端加电信号时发光二极管宣告光线，光敏三极管接受光线之后就发作光电流，从输出端流出，然后完结了“电—光—电”变换。典型运用电路如下图1-1所示。

光耦的首要利益是：信号单向传输，输入端与输出端完全完结了前端与负载完全的电气隔绝，输出信号对输入端无影响，减小电路搅扰，简化电路规划，作业安稳，无触点，运用寿命长，传输效率高。光耦合器是70年代发展起来的新型器件，现已广泛用于电气绝缘、电平变换、级间耦合、驱动电路、开关电路、斩波器、多谐振荡器、信号隔绝、级间隔绝、脉冲扩展电路、数字外表、远距离信号传输、脉冲扩展、固态继电器(SSR)、仪器外表、通讯设备及微机接口中。在单片开关电源中，运用线性光耦合器可构成光耦反响电路，经过调度控制端电流来改动占空比，抵达精密稳压目的。

2光耦典型电路

常用于反响的光耦类型有TLP521、PC817等。这儿以TLP521为例，介绍这类光耦的特性。图2-1所示为光耦内部结构图以及引脚图。

TLP521的原边相当于一个发光二极管，原边电流If越大，光强越强，副边三极管的电流Ic越大。副边三极管电流Ic与原边二极管电流If的比值称为光耦的电流扩展系数，该系数随温度改动而改动，且受温度影响较大。作反运用的光耦正是运用“原边电流改动将导致副边电流改动”来完结反响，因而在环境温度改动剧烈的场合，因为扩展系数的温漂比较大，应尽量不经过光耦完结反响。此外，运用这类光耦有必要留心规划外围参数，使其作业在比较宽的线性带内，否则电路对工作参数的敏感度太强，不利于电路的安稳作业。

一般选择TL431结合TLP521进行反响。这时，TL431的作业原理相当于一个内部基准为2.5 V的电压过失扩展器（输出的电压进行过失扩展比较，然后将取样电压经过光电偶合器反响控制脉宽占空比，抵达安稳电压的目的），所以在其1脚与3脚之间，要接补偿网络。

TL431是由德州仪器出产的可控精密稳压源，什物如图2-3所示。它的输出电压用两个电阻就可以恣意的设置到从2.5V到36V范围内的任何值。该器件的典型动态阻抗为0.2Ω，在许多运用中用它代替稳压二极管，例如，数字电压表，运放电路，可调压电源，开关电源等。图2-2所示为TL431引脚摆放与运用连线图。

常见的光耦反响第1种接法。Vo为输出电压，Vd为芯片的供电电压。com信号接芯片的过失扩展器输出脚。留心左边的地为输出电压地，右边的地为芯片供电电压地，两者之间用光耦隔绝。图2-3所示接法的作业原理如下：当输出电压升高时，TL431的1脚(相当于电压过失扩展器的反向输入端)电压上升，3脚(相当于电压过失扩展器的输出脚) 电压下降，光耦TLP521的原边电流If增大，光耦的另一端输出电流Ic增大，电阻R4上的电压降增大，com引脚电压下降，占空比减小，输出电压减小；反之，当输出电压下降时，调度进程类似。

高于反相端电位的方式，运用运放的一种特性—当运放输出电流过大(超越运放电流输出才干)时，运放的输出电压值将下降，输出电流越大，输出电压下降越多。因而，选用这种接法的电路，一定要把PWM（脉冲宽度调制）芯片的过失扩展器的两个输入引脚接到固定电位上，且有必要是同向端电位高于反向端电位，使过失扩展器初始输出电压为高。图2-3所示接法的作业原理是：当输出电压升高时，原边电流If增大，输出电流Ic增大，因为Ic现已超越了电压过失扩展器的电流输出才干，com脚电压下降，占空比减小，输出电压减小；反之，当输出电压下降时，调度进程类似。

常见的第3种接法，如图2-4所示。与第一种底子类似，不同之处在于多了一个电阻R6，该电阻的作用是对TL431额外注入一个电流，避免TL431因注入电流过小而不能正常作业。实际上如恰当选取电阻值R3，电阻R6可以省掉。调度进程底子上同1接法一起。

常见的第4种接法，如图2-4所示。该接法与第2种接法类似，差异在于com端与光耦第4脚之间多接了一个电阻R4，其作用与第3种接法中的R6一起，其作业原理底子同接法2。

反响方法1、3适用于任何占空比（接通时间与周期之比）情况，而反响方法2、4比较适合于在占空比比较小的场合运用。

3、小结

开关电源的光耦首要是隔绝、供应反响信号和开关作用。开关电源电路中光耦的电源是从高频变压器次级电压供应的，当输出电压低于稳压管电压是给信号光耦接通，加大占空比，使得输出电压升高；反之则关断光耦减小占空比，使得输出电压下降。旦高频变压器次级负载超载或开关电路有毛病，就没有光耦电源供应，光耦就控制着开关电路不能起振，然后保护开关管不至被击穿焚毁。

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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