两线制变送器微功率隔离电源设计.pdfVIP

　2007 年 仪 表 技 术 与 传 感 器 2007 　 　第 2 期 Instrument 　Technique 　and 　Sensor No 2 　 两线制变送器微功率隔离电源设计 梁 　伟 (绍兴文理学院机电系 ,浙江绍兴 　312000) 　　摘要 :介绍了一种用于两线制变送器的微功率隔离式电源 , 核心采用高转换效率的 DC/ DC 芯片 MAX639 。它以降落 在两线制变送器上的 12～35 V DC 为输入电压 ,固定消耗35 mA 电流,提供了两组互相隔离的 3 V 电源。与输入不隔离 的一组最大具有5 mA 负载能力 ,与输入隔离的一组最大具有3 mA负载能力。 关键词 :微功率 ;隔离电源;两线制变送器 ;温度补偿 ( ) 中图分类号:TN302 ;TP303 　　　文献标识码 :A 　　　文章编号 :1002 - 1841 2007 02 - 0042 - 03 Design of Micropower Isolated Power Supply of Twowire Transmitter LIANG Wei ( Department of Mechanical and Electronic Engineering ,Shaoxing College of Arts and Sciences ,Shaoxing 312000 , China) Abstract :Introduced a micropower isolated power supply of twowire transmitter ,which adopts high conversion efficients DC/ DC chip MAX639 that offers highperformance of the power supply for twowire intelligent transmitter. This power supply made use of the 12～ 35 V DC as the input voltage ,dissipated the 35 mA current rating ,and provided twogroup mutually isolated 3 V power supplies. The one group ,which is not isolated from the input ,has the maximum 5 mA loading capacity. The other ,isolated from the input ,has the maxiumum 3 mA loading capacity. Additionally ,also presented the scheme by the software temperature compensation ,which could offer highaccuracy compensation to the input current temperature drift caused by the temperature change. Key words :micropower ;isolated power supply ;twowire transmitter ;temperature compensation 0 　引言 现场变送器。