大功率高精度程控直流电流源的设计与实现

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。

Design and implementation of high power and high precision programmable DC current source

Design and realization of programmable DC current source with high power and high precision is important and significant for the situation that requires high precision DC current source.In order to achieve the design require-ments of high precision DC current source with high output power,high stability,high precision,small ripple,small step,this paper introduces a high precision programmable DC power based on STM 32F103 microcontroller.The sys-tem is composed of double closed-loop,fuzzy controller and AD/DA devices that constitute the out digital loop circuit to shorten the adjustment time of the output steady current,the inner loop with PI regulator consists current series neg-ative feedback circuit to suppress interference continuously and improve accuracy of output current.This paper designs DC voltage stabilized amplifier circuit, Darlington amplifier circuit and power amplifier circuit to achieve the high power output.Experimental results show that the output accuracy of the power supply is 2/100 000,the stability can reach 3/100 000 and the load capacity is strong,which is especially suitable for occasions with high precision require-ments.