【正文】 ）為36 v,負(fù)載能力2A,選擇頻率:400赫茲or1000Hz； 一個(gè)通道區(qū)域的庫(kù)侖(DC短路)打開(kāi)電源,固定不同的速率； 一個(gè)通道的直流電源打開(kāi),固定值27 v； 四個(gè)頻道的正負(fù)電源,負(fù)載能力3A。在另一個(gè)方面,分機(jī)是由嵌入式C語(yǔ)言開(kāi)發(fā),高效收集工作數(shù)據(jù)和實(shí)時(shí)處理消息都能做到最好[12]。在軟件系統(tǒng)里,控制程序在主機(jī)電腦使用的語(yǔ)言是實(shí)驗(yàn)室開(kāi)發(fā)的Windows /CVI的語(yǔ)言,它的充分的優(yōu)勢(shì)是有利的人機(jī)交互界面和豐富的庫(kù)函數(shù)[9]。同時(shí),也包含足夠的輸出功率,長(zhǎng)期操作能力和強(qiáng)大的抗干擾能力。分析導(dǎo)彈在復(fù)雜應(yīng)用中的屬性,一種特殊的陀螺儀轉(zhuǎn)盤(pán)數(shù)字電源系統(tǒng)是必要的，導(dǎo)彈往往通過(guò)不同的工作條件,可以模擬由陀螺儀在半物理仿真狀態(tài)進(jìn)行性能評(píng)估[]。軟件設(shè)計(jì)。關(guān)鍵詞實(shí)驗(yàn)室Windows /CVI。此外,特定需求的數(shù)字電源半實(shí)物仿真系統(tǒng)的某導(dǎo)彈還描述了。 Co. KG,2004.[2] QI Dong. “A Kind of Power Supply of Opticelectric Current TransformAcmodating Wide Bus Dynamic Current”. Proceedings of the CSEE，, : , 2007.[3] Qian Zheng. “Power Supply for High Voltage Circuit of Active Electronic Current Transformer”. High Voltage Apparatus.， ,：, 2004.[4] Zhenquan Sun，Xuefeng Zhao，Hongwei Gu，Yanming Li. “A new design of power supply for electronic current or voltage transformer”.Proceedings of International Conference on Machine Learning and Cybernetics, , B22:14.[5] Wu Jintao, Sheng Gelai, Zeng Yi, Jiang Xiuchen. “Power supply designof monitoring device used in Transmission line online”. Power SupplyTechnology，: , 2009. 2010年國(guó)際會(huì)議上測(cè)量技術(shù)和機(jī)電一體化的自動(dòng)化Xudan XuSchool of Automation Science and ElectricalEngineering, Beihang UniversityHaidian, Beijing, ChinaEmail: xxdTianpeng Yu, Yue MaShanxi North Huifeng Machinery amp。 however, the difficulty is that its dynamic range adapted to changes in bus current is lack. The power supply design in this paper use a special current transformer to acquire power from primary side, and focus on solving power conversion and power transmission of signal converted from current transformers. Design a selfpowered circuit, similar to switching power supply, provide a stable and reliable power supply for the digital relays. The approach can avoid the saturation problem of core coil when primary current change in a larger range by increasing the air gap in the core coil and introducing airgap magnetic reluctance. So that the backend circuit is significantly simplified and the reliability is improved. The solution of power supply adopted floating potential, which relates to current size, but not to voltage level. Therefore, the power supply module can be used in relay protection of power system with 10kV voltage level and above and online monitoring devices, which has a broad application prospects.ACKNOWLEDGMENT This paper is supported by the Key Scientific and Technological Innovation Program of Shanxi Province(No.:2009ZKC0213) and National Basic Theoretical Research Project (No.:2009CB7245073).REFERENCES[1] . Digital selfpowered Overcurrent Relay[EB/OL]. Schaltanlagen Elektronik Ger228。 the loss of core is small, increasing the efficiency of energy transfer. According to the materials above, the core air gap is increased to reduce the entire magnetic circuit reluctance and highperformance core material is selected. Furthermore, the volume and weight of core should be minimized as far as possible under the premise of meeting the power required by the backend circuit. The internal diameter of selected silicon steel core d = 55mm, the external diameter D = 95mm, height h= 20mm, saturation magnetic flux density Bs=, then, the average magnetic circuit length l =π (d + D) / 2 = . If the length of core airgapδ =1mm , and then the relative magnetic permeability of the core increased the gap is equivalent to ≈ eq μ , magnetic permeability is greatly reduced. At this point, excitation current value caused core saturation I max ≈ μ , effective value of current is 1016A, which shows that the core will not be saturated when the wire currents are within the 1016A after using this structure. In fact, in order to fix air gap conveniently, the two thick nonmagnetic material is padded in the middle of two Cshaped core. Due to its relative permeability is about 1, the effect is the same as the air gap. In the noload conditions, when the conductor effective current I1=40A, in order to obtain the 9V valid voltage from the secondary coil, there are: Where, U2 is the secondary side voltage, f is current frequency, N2 is the number of secondary side coil turns, Bm is the amplitude of magnetic flux density, Seq is the effective crosssectional area of core, λ is core lamination factor, 0 μ is the vacuum magnetic permeability.Order was: In the circumstances that the core structure and the length of air gap are determined, the right of equation (2) is about equal to a constant. Take in the design value as substitution, 1500 2 N ≈ (turns). Select enameled wire with steel heart, carrier density is calculated according to 8A/mm2, the crosssectional area of wire is demanded , corresponding to a diameter of . Take into account a certain margin, the final choice is wire with copperheart diameter.IV. SOME KEY TECHNOLOGIESA. Signal Acquisition and Charging Circuit The threephase AC current signal, sensed from primary side bus by current transformer, first passes through the controlled bridge rectifier circuit. The AC signal is changed into DC current signal, which is then converted to voltage signal by the resistor R. This voltage signal can be used as the input of sampling signal, can also charge energy storagecapacitor. Singlephase controlled bridge rectifier circuit and charging circuit shown in . The output of threephase rectifier circuit are connected together in parallel, so it can guarantee that the energy storage capacitor is charged regardless any one phase rectifier conduction current on, that is to meet the power requirements.Figure 2 Singlephase controlled bridge rectifier circuit and charging circuitB. Voltage Regulator Circuit LM2576 voltage regulator is used in voltage regulator circuit, shown in . Series of switching regulator LM2576 is a monolithic integrated circuit, suitable for stepdown switching regulator, can drive load. Its fixedoutput voltage is , , 12V, 15V. Power consumption ofLM2576 is very low,