摘要
针对数控直流恒流源的设计进行了探讨,对比已有的恒流源实现方式,分析了其缺点,重点介绍1种高效率的基于可调稳压芯片的数控恒流源。给出了电路原理图,就整机工作原理、相关参数计算做了详细介绍。从系统组成角度分别介绍了核心模块、反馈模块及其实现方法。其基本原理是利用核心芯片的反馈引脚,把并联反馈改为串联反馈,从而实现恒流性能。系统具有输出电流可预置,输出纹波电流低等特性。采用设计的恒流源电路在自行研制的某仪器已推广应用。
Briefly discusses the design of DC constant current source,and discusses the existing devices,analyses their disadvantages,mainly introduces an efficient digital controlled constant current source which is based on adjustable voltage regulator.The schematic diagram of the circuit is given.The author introduces the principle of the system and the relation parameter in detail.Kernel model and feedback model are introduced from the point of view of system composition.The principle of the system is using the kernel chip＇s feedback pin,changing the parallel feedback to serial feedback.This system has function of current preset and low current ripple etc.An instrument developed by the author employs the constant current circuit designed in this paper and has got popular applications.
出处
《电子测量技术》
2011年第7期13-15,共3页
Electronic Measurement Technology
