Research On Solar Energy Acquisition System Based On Intelligent Charging Chip

This paper mainly focuses on the research and design of solar microenergy acquisition system.Based on the intelligent charging chip BQ25505,the function of microenergy acquisition and storage is designed.The key voltage and charging efficiency of the designed power management circuit are s imulated and analyzed by Cadence.Firstly,the research background and significance of this topic are introduced,and the research status of micro-energy collection at home and abroad is investigated.The basic theory of crystalline silicon solar cells and the theory of switching power supply are studied.According to the function and internal structure of BQ25505 chip,the design theory of the circuit is described.Then,the intelligent charging chip BQ25505 solar micro energy acquisition system is designed,and a novel micro energy acquisition solution is proposed to efficiently collect and manage the power from the micro watt(u W)to the micro watt(m W)generated in the crystalline silicon solar cell.The dual power supply design of the main battery and the standby battery is adopted to solve the imbalance between the energy collected by the energy collection terminal of the traditional charging equipment and the energy consumption of the load.Secondly,the EDA software Cadence is used to complete the simulation of the key voltage of the power management system circuit,which verifies the rationality and stability of the circuit system.The Pspice model is used to simulate and calculate the charging efficiency of the circuit,which solves the problem that it is difficult to measure the efficiency of the micro-energy collection circuit under low Iq and DCM mode,and lays a foundation for the further analysis and research of micro-energy collection.Finally,based on the designed BQ25505 solar microenergy acquis ition system,the physical PCB was made,the experimental test platform was built,and the physical verification and analys is of the designed circuit was carried out.Two kinds of power margin adjustment schemes are designed.One is realized by modifying the peripheral circuit of the designed solar micro energy acquisition sys tem,and the other is designed by using the ultra-low power consumption and efficient synchronous buck-boost converter TPS63900 on the basis of the original circuit.And the EDA software Cadence is used to complete the simulation of the key voltage of the p ower margin regulation circuit to verify the feasibility of the scheme,and improve the system power margin regulation,input current limitation and other functions.Then based on the traditional voltage regulation technology and design in this paper analyses advantages and disadvantages of two kinds of adjustment scheme,the designed power supply margin adjustment function allows Iq is higher than other static current,cannot be compared to the dynamic change of output voltage equipment,reduce the amount of total charge the work each load cycle,battery life extens ion,optimize the efficiency of power management system.Finally,based on the design of the power margin regulation circuit in this paper,the physical PCB is made,the experimental test platform is built,and the physical verification and analysis of the designed circuit is carried out.