Design Of Human-oriented Activities Distributed Hybrid Energy Harvesting System

With the development of modern electronic technology,the trend of miniaturization of electronic equipment is becoming more and more obvious,making a large number of wearable electronic devices enter people's lives and providing convenience for people's lives.For wearable electronic devices,its energy supply has always been an important issue that has plagued its development.The traditional solution is to replace the battery module used for energy storage to achieve energy supply,but this method has many problems,such as increased cost,difficult operation,and increased maintenance costs.In order to solve the energy supply problem of wearable electronic devices,this paper proposes a concept of a human-oriented distributed hybrid energy harvesting system based on energy harvesting technology,that is,by collecting energy involved in human daily life,powering electronic devices.On the one hand,it reduces the cost of energy supply for electronic products,and on the other hand,it helps to greatly extend the life of electronic products.The main content of this article can be divided into the following aspects:Firstly,this paper designs a distributed hybrid energy harvesting unit for energy harvesting.The energy sources involved include radio frequency energy,mechanical energy,and thermal energy.The target frequency bands of the RF energy device designed in this paper are 2.1GHz and 2.3GHz.After simulation and optimization,the S11 value at 2.12 GHz is-26 dB and the gain is 2.0dB;the S11 value at 2.32 GHz is-43 dB and the gain is 3.6dB.For the thermal and mechanical energy acquisition module,this article starts with the application scenario,performs a basic structure modeling analysis,and designs a physical structure that meets its application scenario.After testing,under normal walking conditions,the output voltage of the mechanical energy acquisition module is(-4~4)V and the energy is sufficient;the output voltage of the thermal energy collector is 40 mv,which meets the access threshold voltage requirements of the power management circuit.Second,because the received RF energy is in the form of AC,a matching rectifying antenna is also designed,which also includes a voltage doubler circuit.Considering the faintness of the collected energy,this paper designs a first-order voltage doubler rectifier circuit.After optimized.Under the weak energy input of-20 dBm ~ 0dBm,its maximum rectification efficiency is 51.2%.At the same time,because of its relatively simple circuit structure,unnecessary energy loss is also reduced.At the same time,a micro-energy power management circuit based on LTC3108 and LTC3588 is also designed,which converts the collected weak energy into a voltage range that is convenient for application and storage through the above circuit.Finally,a control module for centralized management of mixed energy is designed.These include the overall control ideas involving mixed energy source input,hierarchical energy storage,and maximum energy efficiency output,and specific control ideas for mixed energy source input.It also needs to be referred that,in order to meet the wearable needs,this article also uses SOLIDWORKS software to design the corresponding physical structure for the above modules to meet their wearable requirements.