Chip Research And Design Applied To Weak Energy Harvesting System

Microbial fuel cells(MFCs)are highly valued because they have the ability to oxidize pollutants such as industrial wastewater and domestic sewage and generate electricity.However,due to the limited DC voltage generated,the power generated by the MFC cannot be directly used by external devices.Therefore,how to collect and convert the energy of the MFC has become one of the major research directions,and how to make the MFC efficient Work and reasonable load management have become the focus of research,with significant background and research significance.The master’s thesis is based on the problem of low efficiency and irrational load management of the MFC in the weak energy collection system,In the design of application system,on the one hand,the idea of using a two-stage boost converter and hierarchical management was proposed to design the power management module of the system.On the other hand,debugging existing application modules to meet the functional requirements of the application.The entire application system realizes the maximal power point tracking(MPPT)of the MFC,the two-stage boost conversion of the voltage,the management of the load,and successfully drives the external application load.Experimental results show that the first stage power management boosts the MFC voltage to about 1.1V and maintains the MFC voltage at the optimal power point of 316mV-390mV through the MPPT circuit.The second stage power management boosts the 1.1V voltage to 3.5V and drive the application load every13ms to collect the ambient temperature information once and complete information sending,receiving and stotaging;Then this paper designs the chip system according to the functions and corresponding parameters implemented in the application system design.In the chip system design,on the one hand,we studied and designed ultra-low-voltage self-starting circuits applied to weak energy harvesting systems,innovative low-voltage low-power hysteretic comparators such as modular circuits suitable for iow-voltage environments,On the other hand,the power management module in the application system is optimized,a single-stage boost converter based on a voltage converter is adopted,a dynamic voltage comparator and a control switch are used to manage the load.At the end of the paper,the layout of the hysteresis comparator module and charge pump module of the chip system is mapped,verified,post-simulated,and taped.The design is based on a 180nm CMOS process,and the die area after tapeout is approximately 0.111 mm2.The experimental results of the chip system show that the first:the chip system successfully boosted the MFC voltage to 1.82V,implemented the MPPT function to limit the MFC voltage between 390mV and 470mV,and realized the management of the load;second:The start-up circuit can be self-started at a minimum of 80mV.The whole chip circuit can work under a low voltage environment of 1.2V;third:the boosting efficiency of the transformer can reach 90.3%under an output voltage of less than 2V.Compared with other similar systems at home and abroad,although the degree of integration is relatively poor,the startup performance is better,the voltage conversion efficiency is higher,and the functions are more complete.