Design and Implementation of a charge-protection circuit for Lithium-ion capacitors for WIMEA-ICT project
Wangui Wairimu, Joan
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LICs have found many applications for example in Automated Weather Stations in the WIMEA-ICT project. They are a relatively new technology and currently there is no analogue all in-one charge-protection circuit design to prevent over charge and over discharge. Therefore, this project’s main objective was to design and implement a charge-protection circuit to regulate the voltage within the range of 2.2V – 3.8V. The methodology was divided into four phases which included; Planning of the project, design and simulation of the hardware, fabrication of the hardware and PCB fabrication. The key resultswere that below 2.2V the LIC charged and the load was shut down, 2.2V to 3.8V the LIC charged and above 3.8V the LIC stopped charging. We recommended the use of high-fidelity comparators which give exact values at a given threshold unlike the general-purpose comparators that were used for this project. Finally, a device which ensured that the LIC charges below 2.2V and the load shut down to avoid draining the LIC further, between 2.2V to 3.8V the LIC charges and stops charging above 3.8V thus safe operation of the LIC was designed. A Printed Circuit Board (PCB) was also designed, and I believe that many of them can be manufactured and sold at a price of a charge protection circuit of Lithium-ion batteries.