Design And Analysis Of Flyback Converter Based On Primary-side Feedback Control

With the rapid development of economy in our country, the aerospace industry has made great progress. Growing the importance of space strategy to be reflected, aerospace systems running the most important is energy source. There is plenty of solar energy in space and satellite can generate electricity by solar panels. Then under the control allocation of aerospace power supply, power supply provide for various electronic devices in space. Space secondary power plays an important role in energy conversion aerospace systems. However, the space is filled with magnetic particles and vacuum, and there is a big difference of temperature between day and night. This kind of environment puts forward more strict requirements on the secondary power supply relative to our common environment. The stability and reliability become the most essential in space power. This paper designed a auxiliary power via flyback converter topology by using primary-side feedback control to improve the reliability of the secondary power supply module, which has important theoretical and practical va lue.This topic discussed the existing primary-side feedback control flyback solutions and summarized the existing primary-side control implementation approach for the flyback circuit and control strategy. This paper adopted a novel sampling feedback method that the flyback circuit worked in discontinuous current mode to primary-side feedback control. The current is compensated to seek precise sampled voltage. Through the closed loop control strategy, voltage loop realized the output voltage control and current inner ring tested input current. There is a detailed analysis of the working principle of the flyback feedback control based on the primary side. On the basis, firstly small-signal modeling of flyback circuit could be conduct. Second, the effects of non-ideal conditions ideal and the parasitic parameters of the converter have discussed. Finally, The main circuit and control circuit parameters have been complete designed. The main circuit parameter includes clamp circuit parameters, transformer design, the output capacitor other relevant quantitative calculations.Taking a space power project as an object and according to the main circuit and control loop design method, The specific compensation network and the parameter design have completed. Using Matlab simulation software to build the simulation model and the Saber to completed the relevant simulation analysis. On the basis of the simulation analysis, the prototype were built and completed experiments. The simulation and experimental results verify the feasibility of the design. The experimental results show that this design have high stability, small ripple and a certain application value.