摘要：现今社会中很多器件工作时都是需要直流供电的，对直流电压和电流也有很多要求，而市电只能提供220V或三相380V的交流电。为了解决这一问题，我们可以采用串联开关型直流稳压电源电路，它不仅功耗小，效率高，而且体积小，重量轻，更重要的是滤波效率大为提高，使滤波电容的容积和体积大为减小。直流稳压电源主要由电源变压器、整流滤波电路、稳压电路及保护电路组成，作用是将交流电转换成稳定的直流电。通过探讨利用Multisim虚拟实验平台完成直流稳压电源的设计。通过仿真软件中的虚拟仪器、仪表观察和测试电路的特征参数，分析设计电路的性能，完成对电路元件参数的调节。最后对设计电路进行测试，得出实验结论。

关键词：直流稳压电源；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