Synthesis Of Propylene From Urea Alcoholysis Catalyzed By Hydroxyapatites

Lead-acid battery as the most widely used secondary energy, hascaptured more than85%of market share. As a kind of reusable energy,the performance of charging source is a key factor which affects the lifeand security of battery. Therefore, researching and developing of a kindof high-performance charging source becomes a very important researchsubject. The research target of this paper is to develop a lead acid batterycharging source which is high reliability, high efficiency, good stability,small volume and light weight.Firstly, the charging method of storage battery was studied in thispaper. A new kind of charging method----six stages of charging method,was used based on research and analysis of several kinds of traditionalcharging methods. Six stages of charging method can make the chargingcurve closer to the ideal curve and realize quickly charging and havesmall damage for the battery.Secondly, the switch technology of switching power supply wasstudied in this thesis. The lose of traditional hard switching power supplyis very big when the power tube is on and off. The soft switching powersupply has become the mainstream of the development of large andmedium power sources, which not only can reduce the loss, but also canimprove the stability and reliability of system. ZVS (Zero VoltageSwitching) soft switch technology was adopted in the charging powersupply of this paper. Main circuit parameters and device selection of ZVSconverter were designed according to the technical requirements ofcharging power supply. And the ZVS converter was verified inPspice10.5simulation software.Finally, based on the powerful capacity of digital signal processingand computing of DSP chip, DSP（Digital Signal Processor）technologywas introduced into the charging power supply control system and thelead-acid battery charging source control system was designed which was based on the TMS320F2812chip as the core. DSP directly involved inthe control of ZVS converter, and monitored the whole system, comparedto the half-digitalization charging power supply which was controlled byMCU （Micro-programmed Control Unit, which fully realized thedigitization and the design of the drive circuit, voltage and currentsampling circuit, protective circuit were completed and the ant-saturationPI control algorithm was realized. At the same time, experimental circuitwas set. The experiment shows that the digital control circuit is stable andreliable, converter realizes zero voltage switch and battery chargingexperimental results have reached the expected requirements.