Design And Implementation Of Composite Power Management System Based On Fuel Cell

With social development and technological advancement,energy plays a very important role in human life.Hydrogen-oxygen fuel cells have the advantages of high energy conversion efficiency,portability,cleanliness and environmental protection,and are one of the most widely used energy sources.However,the output of the oxyhydrogen fuel cell is unstable during the startup and shutdown phases,and the maximum operating current is affected by the electrode area.As an independent power source,there are certain disadvantages.The lithium battery output is stable and can be quickly charged and discharged.Therefore,considering the establishment of a fuel cell-based composite power management system,the combination of two power sources,complementary advantages,which is of great significance for the development of energy technology.This paper firstly studies the working principle of hydrogen-oxygen fuel cell and lithium battery,tests and analyzes the working characteristics of two power supplies,and compares the advantages and disadvantages of two power supply performance.A fuel cell-based composite power management system is established,which is divided into three steps: system-aware input,compound strategy decision,and composite strategy execution.Design a composite power management system hardware board with functions such as charging lithium battery,load power detection,switching arbitration,and lithium battery power detection.Designed to complete two charging modes: normal charging(1A)and fast charging(4A),charging power up to 56 W.The load current range is 0-20 A and the load voltage range is 0-22 V.By optimizing the circuit layout,interface design,etc.,compared with the first version of the board,the optimized hardware board size has been reduced by 40.92%.The software part realizes the writing of the underlying driver of each functional module,and increases the human-computer interaction platform to improve the system maintainability.According to the two types of power supply operating characteristics,the fuel cell composite power management decision-making process is analyzed in detail,and the power switching arbitration is completed according to different working phases of the fuel cell.Finally,the hardware and software cooperate to assemble the battery prototype test.Through the prototype test,the fuel cell composite power management system can dynamically judge the power usage according to the load power demand,and can realize two charging modes of 1A/4A.The final completed fuel cell composite power management system has good stability and can work with different load power demand scenarios.This system can provide some reference for the research of fuel cell composite power management system.