Research On Power Module Of Enhanced Ocean Monitoring Internet Of Things

China’s Ocean Development Report2012, from the characteristics of marineaffairs development between China and surrounding countries in2011, systematicallyanalyzed status and tendency of marine development and objectively describeddevelopment processes and achievements of China’s marine career meanwhile made acomment on special focused marine issues, like marine ecological environmentprotection, resource development and prevention and reduction of natural disasters.Along with digging deeper into marine observation and real need in ecologicalenvironment monitoring, marine pollution and ecological environment monitoringbuoy IOT system has been rapidly developed in recent years, which is a technicalmeans in implementing automation and network of marine pollution and ecologicalenvironment monitoring. It is one of the main directions in marine environmentmonitoring.Buoys mostly work in severe area which is far from coast area and mainly relyon various battery packs or combine with solar system for power supply. The designworking life of marine buoys are generally more than five years, due to the limitationof battery life and unpredictable long time continuous rainy days, the batteries designcapacity is greatly redundant. It needs more battery cells to make multiple-seriesconnection. Because of cell production consensus problem, with the increment ofcells, the longevity of the battery pack will shorten faster, so the way to increasecapacity only by increasing the amount of cells doesn’t work. Marine buoys mostlywork far from coastline and have a great number in scattered areas, so replacingbattery pack is difficult and expensive even impossible. The power supply becomesthe bottleneck of IOT’s regular work. If some nodes are power off, the whole sensornetwork lifecycle and its function will be influenced.The way to change the traditional mode of power supply by one large capacity battery is using dual battery packs. The cycle performance of li-ion battery pack indifferent depths of discharge was studied and drew the fitted curve. Then the depths ofdischarge in traditional mode and dual battery packs mode were calculated and thecycle indexes were calculated in these two modes. At last, the total service time canbe calculated by the time for a single use. The result shows the system can serverlonger by dual battery packs power supply.The traditional battery pack capacity design only considered one section ofsuccessive rainy days and it ignored the probability of one section of successive rainydays after another in a short time and the battery pack cannot be charged fully tocause system outage. This paper presents the mathematical model of solar energypower supply system derived from double batteries switching technology. Thebatteries are divided into main batteries and auxiliary batteries. The main batteries areused regularly and the auxiliary batteries are used in periodic rainy weather. The mainadvantage of this model is that the capacity of auxiliary batteries can be dynamiccalculated based on the numbers of maximum continuous rainy days and minimumintervals between rainy days. The batteries capacity is sufficient but not redundant.This design project has been tested on marine buoys and the accuracy of the model issplendid for most engineering projects.