| The aerospace industry is a reflection of a country’s scientific and technological strength and armament strength.In recent years,China’s research in the field of aerospace aircraft has made rapid progress.In order to ensure the safe and reliable operation of the aircraft,it is necessary to provide it with a stable and efficient power supply and distribution management system.At present,switching converters have the problem of single volume and large output.Therefore,more and more scholars are focusing on Single-Inductor Multiple-Output(SIMO)switching converter.The research on high-performance digital SIMO switching converters will greatly promote the development of spacecraft power supply and distribution management systems,which can significantly improve the performance of related products,improve system integration,and reduce system costs.Due to the converter has only one inductor for any number of outputs,the SIMO switching converter has a series of problems such as large steady-state ripple,large cross interference,and high switching loss.In this paper,the working principle and steady-state equivalent circuit of Buck SIDO switching converter topology.in order to reduce the cross-interference between multiple output branches of SIDO converter,a digital Buck-SIDO switching converter algorithm based on steady-state prediction and transient trajectory prediction is designed.In the same time,a digital Buck-SIDO switching converter system verification platform is established,and the effectiveness of the algorithm is verified on Xilinx Spartan6 FPGA.The test results show that when the output load of a branch changes from 0.1A to 0.3A,the amount of cross-interference is 6.6% of the output voltage value,and the amount of itself-interference of the branch is 10% of the output voltage value.The results show that the proposed digital control algorithm can effectively reduce the cross-interference of the converter system and improve the dynamic response performance of the converter. |
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