大功率高精度程控直流电流源的设计与实现

发布时间：2018-04-10 19:49

本文选题：程控直流电流源 + 大功率　；参考：《电测与仪表》2017年21期

【摘要】：大功率高精度程控直流电流源的设计与实现对各种要求高精度直流电流源的场合具有重要作用和意义。为了达到输出功率大,稳定度高,精度高,纹波小,调节细度小的高精度直流电流源设计要求,文中设计实现了一种基于STM32F103微控制器为主控制器的高精度程控直流电流源。该系统由双闭环控制系统组成,外环由模糊控制器与AD/DA器件构成数字控制电路,可快速调节电流稳态输出,内环由PI调节器构成电流串联负反馈电路,可抑制干扰并提高输出电流精度。设计了直流稳压扩流电路和达林顿放大电路及功放电路实现了大功率输出。实验结果表明该电流源输出精度可达到十万分之二,稳定度达到十万分之三,带负载能力强,特别适合于要求高精度的场合。
[Abstract]:The design and realization of high power and high precision program controlled DC current source is of great importance to all kinds of occasions where high precision DC current source is required.In order to meet the design requirements of high precision DC current source with high output power, high stability, high precision, small ripple and low adjusting fineness, a high precision programmable DC current source based on STM32F103 microcontroller is designed and implemented.The system consists of a double closed loop control system, a digital control circuit composed of a fuzzy controller and a AD/DA device, which can quickly adjust the steady state output of the current, and an inner loop is composed of a Pi regulator to form a series negative feedback circuit of the current.It can suppress interference and improve the precision of output current.High power output is realized by designing DC steady voltage diffuser circuit, Darlington amplifier circuit and power amplifier circuit.The experimental results show that the output accuracy of the current source can reach 2/100000, the stability reaches 3/100000, and the load capacity is strong, which is especially suitable for high precision situations.
【作者单位】：南昌大学;国网江西省电力公司信息通信分公司;全志科技股份有限公司;
【基金】：国家自然科学基金资助项目(61261011) 江西省科技厅科技支撑项目(20142BBE50034)
【分类号】：TN86

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