摘要：该数控直流电流源以精密压控电流源为核心、用单片机、DAC组成控制电路，引入“S类”反馈控制功率放大电路，实现超精密电流控制、具备精准的扩流能力、低失调、有步进、同时带有丰富扩展功能的精密电流源。经过ADC采样，完成输出电流显示功能，并使输出范围覆盖0～2A，是理想的电流源解决方案。关键词：精密电流源低失调S类功率放大器Abstract:ThedirectcurrentsourceofnumericalcontrolbasesonaccurateVCCS,usingMCUandDACascontrollerkernel,importingcircuitofpoweramplificationoftypeSwithfeedbackcontrol;achievesultraaccuratecurrentcontrol;haslowoffsetandexcellentcapacityforcurrentenlarging;hasstepbystepmotion.Atthesametime,itprovidesabundanceextendedfunctions.AccordingtotheADCsampling,itcarriesoutthefunctionofdisplayingthecurrentoutput,meanwhileitachievesarangeof0to2A.Aboveall,itisanidealsolutionofcurrentsource.Keyword:accuratecurrentsource,lowoffset,poweramplificationoftypeS目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc114142711"1方案论证与比较PAGEREF_Toc114142711\h3HYPERLINK\l"_Toc114142712"1.1精密压控电流源方案论证PAGEREF_Toc114142712\h3HYPERLINK\l"_Toc114142713"1.2扩流模块方案论证PAGEREF_Toc114142713\h3HYPERLINK\l"_Toc114142714"1.3电流检测方案论证PAGEREF_Toc114142714\h4HYPERLINK\l"_Toc114142715"1.4功率输出级电源方案论证PAGEREF_Toc114142715\h4HYPERLINK\l"_Toc114142716"1.5其它模块电源方案论证PAGEREF_Toc114142716\h4HYPERLINK\l"_Toc114142717"2系统设计PAGEREF_Toc114142717\h5HYPERLINK\l"_Toc114142718"2.2单元电路设计PAGEREF_Toc114142718\h6HYPERLINK\l"_Toc114142719"2.2.1压控电流源单元电路设计PAGEREF_Toc114142719\h6HYPERLINK\l"_Toc114142720"类功率放大器电路设计（理论推导和证明）PAGEREF_Toc114142720\h7HYPERLINK\l"_Toc114142721"2.2.3数控电路设计PAGEREF_Toc114142721\h10HYPERLINK\l"_Toc114142722"2.2.4大功率电源模块PAGEREF_Toc114142722\h11HYPERLINK\l"_Toc114142723"3软件设计PAGEREF_Toc114142723\h11HYPERLINK\l"_Toc114142724"4系统测试PAGEREF_Toc114142724\h13HYPERLINK\l"_Toc114142725"4．1测试仪器PAGEREF_Toc114142725\h13HYPERLINK\l"_Toc114142726"测试方法PAGEREF_Toc114142726\h13HYPERLINK\l"_Toc114142727"测试数据PAGEREF_Toc114142727\h14HYPERLINK\l"_Toc114142728"5结论PAGEREF_Toc114142728\h15HYPERLINK\l"_Toc114142729"参考文献：PAGEREF_Toc114142729\h15HYPERLINK\l"_Toc1