摘要：現今社會中很多器件工作時都是需要直流供電的，對直流電壓和電流也有很多要求，而市電只能提供220V或三相380V的交流電。為了解決這一問題，我們可以采用串聯開關型直流穩壓電源電路，它不僅功耗小，效率高，而且體積小，重量輕，更重要的是濾波效率大為提高，使濾波電容的容積和體積大為減小。直流穩壓電源主要由電源變壓器、整流濾波電路、穩壓電路及保護電路組成，作用是將交流電轉換成穩定的直流電。通過探討利用Multisim虛擬實驗平臺完成直流穩壓電源的設計。通過仿真軟件中的虛擬儀器、儀表觀察和測試電路的特征參數，分析設計電路的性能，完成對電路元件參數的調節。最后對設計電路進行測試，得出實驗結論。

關鍵詞：直流穩壓電源；Multisim; 仿真；

Abstract: In the modern society many devices are all need to DC power supply when they work there are many requirements of a DC voltage and current, and the utility can only provide 220V or 380V ac three-phase. In order to solve this problem, we can use the tandem switch-type dc voltage stabilizer circuit, it is not only small power consumption, high efficiency, and small volume, light weight, more important is to filter efficiency greatly improved, the volume of filter capacitance and volume reduced greatly. DC voltage stabilizer mainly consist of the power transformers, rectification and filter circuit, voltage-stabilizing circuit and protective circuit, the role will convert AC into a steady electric current. Through discussing the use of virtual experiment platform Multisim, we can complete the design of adjustable dc voltage stabilizer. Through the simulation software of virtual instrument and meter observation and the characteristics of the test circuit parameters, analysis and design circuit performance and completing the adjustment of circuit components. At last, we must test the design circuit, then produce the experimental conclusions.

Key words: DC voltage stabilizer; Multisim; simulation