| Energy crisis and environmental pollution are the two problems that today's world faces, and both of them are related with the use of vehicles. In order to maintain the sustainable development of auto industry, it is imperative to develop zero-emission electric vehicle. Lithium iron phosphate battery has been applied to power system of electric vehicle more widely because it has the advantages of secure, environmental protection, stable performance and economic. However, to apply and publicize the electric vehicles, characters of intelligent and safe charge of lithium iron phosphate battery are the prerequisites. In this paper, it introduces the research of the lithium iron phosphate battery intelligent charging system, the main research content and innovation points are as follow:First of all, this paper introduces the whole scheme of the intelligent charging system, and determines the design parameter, power model of full bridge transform circuit and PWM switch situation control circuit. Based on the analysis of common charging methods, a four-phase intelligent charging method has been proposed according to the related characteristics of lithium iron phosphate battery.Secondly, this paper introduces the designed hardware, including the design of filter circuit to restrain electromagnetic interference, IGBT driving circuit, high-frequency transformer, input/output filter circuit, SCM control loop, auxiliary power and intelligent logic circuit. In software, corresponding program for the four-phase intelligent charging method has been worked out, and debugging and testing have been done.Finally, charging experiment on the designed lithium iron phosphate battery intelligent charging system shows that the designed hardware part of intelligent charging system can work normally, and the charging process can going on automatically according to the predetermined process with the use of designed four-phase intelligent charging method. It provides reference value for follow-up research. |
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