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超高稳定度大直流恒流源的设计.pdf

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第40卷 第3期 电 子 器 件 Vol40  No3 2017年6 月 ChineseJournal of Electron Devices June 2017 Design of Ultrahigh ̄Stability Big DC Constant Current Source∗ 1ꎬ2 2∗ 2 2 ZHAN Qing ꎬZHUZike ꎬCHEN Yong ꎬZHANGZichang ꎬ 2 2 ZENGShufan ꎬLI Yajuan (1.College of Mechanical and TransportationꎬSouthwest Forestry UniversityꎬKunming 650224ꎬChinaꎻ 2.Yunnan TechnologicalResearch Institute of Metrology andMeasurementꎬKunming 650228ꎬChina) Abstract:Development of ultrahigh ̄stability big DC constant current source has important application value in the field of national defense industryꎬmetrologyꎬprecision measurement and so on. The design of DC constant current sourceꎬDC current comparator was adopted as a sampling element and the Distributed Low Load Coefficient Preci ̄ sion Resistor was used as a constant current source feedback and the output signal of the sampling resistorꎬso the overall stability of the constant current sourceswas improved. And the power tube in parallel realized DC constant current source of big current outputꎬthereby the system reliability was also improved. The performance of the designed constant current source is testedꎬand the results indicate that the source could generate a ultrahigh ̄ stability current. The stability of the output current is excel to 0.001%(min)ꎬthe maximal output current is400 A and it’s an excellent ultrahigh ̄stability big DC constant current source. Key words:constant current sourceꎻultrahigh ̄stabilityꎻlow load coefficientꎻbig currentꎻDC current comparator - EEACC:1210        doi:10.3969/j.issn.1005 9490.2017.03.018 超高稳定度大直流恒流源的设计∗ 1ꎬ
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