A Design Of Flyback Switching Power Supply With High Power Factor And High Efficiency

The countries all over the world are developing,and the rapid development of society is accompanied by the great consumption of electricity.It presents a nonlinear characteristic due to its own capacitance and inductance characteristic,which lead to the working current and voltage are not linearly by the power electronic devices and civil appliances.According to the principle of Fourier transform,the nonlinear distortion of the waveform is called harmonic distortion.Distortion of the harmonics in turn interfere with the voltage source,which will affect the work of electrical equipment,resulting in misuse of electrical equipment or not,and will increase the circuit loss,serious Will burn electrical equipment.For the field of lighting,whether industrial lighting,commercial lighting or home lighting,energy-saving emission reduction and harmonic suppression are put forward higher requirements;therefore,the high-power-factor high-efficiency switching power supply research is needed.This article analysis the power factor correction circuit and the working principle of the single-stage flyback converter,also combining with analysis the loss power and calculation of magnetic transformer,eventually identified using a single stage power factor correction flyback conversion topology as circuit design.And through the use of PSPICE software for circuit simulation,a high power factor high efficiency switching power supply is designed and manufactured.Under the conditions of input voltage 85 vac ~ 305 vac,output voltage 40 v,output current 1A,high power factor high efficiency.And through the actual prototype production and testing,the measured prototype power factor up to 0.97,the efficiency of 92%.Eventually reached the design requirements of the index.