电子设计工程
電子設計工程
전자설계공정
Electronic Design Engineering
2015年
22期
86-88
,共3页
4~20mA%LM331%频率/电流%信号转换
4~20mA%LM331%頻率/電流%信號轉換
4~20mA%LM331%빈솔/전류%신호전환
4~20 mA%LM331%F/I%signal change
探讨了3种实现4~20 mA电路的方案,比较了其优缺点;重点介绍了利用LM331实现频率/电压转换;再利用运放和三极管构成恒流电路,将电压转换成电流;实现4~20 mA输出的频率/电流转换的工作原理,并且给出了具体器件参数和控制程序,验证了相关数据. 本电路简单、实用,成本低廉,可广泛应用于单片机、PLC等控制系统中.
探討瞭3種實現4~20 mA電路的方案,比較瞭其優缺點;重點介紹瞭利用LM331實現頻率/電壓轉換;再利用運放和三極管構成恆流電路,將電壓轉換成電流;實現4~20 mA輸齣的頻率/電流轉換的工作原理,併且給齣瞭具體器件參數和控製程序,驗證瞭相關數據. 本電路簡單、實用,成本低廉,可廣汎應用于單片機、PLC等控製繫統中.
탐토료3충실현4~20 mA전로적방안,비교료기우결점;중점개소료이용LM331실현빈솔/전압전환;재이용운방화삼겁관구성항류전로,장전압전환성전류;실현4~20 mA수출적빈솔/전류전환적공작원리,병차급출료구체기건삼수화공제정서,험증료상관수거. 본전로간단、실용,성본저렴,가엄범응용우단편궤、PLC등공제계통중.
This article introduced the three methods about 4~20 mA circuit, compared their advantages and disadvantages. In mainly introduced the method about how to use LM331 to complete the frequency/voltage,and use op-amp and transistor to constitute the constant current circuit, to complete voltage/current.The working principle of frequency/current about how to implementation 4~20 mA output. And give out the device parameters and control program in detail.And verify the relevant data.The features of the circuit is simple, practical,and the cost is low,This method can be widely used in single chip microcomputer and PLC control system .
