一种电能收集充电器的设计.doc

一种电能收集充电器的设计摘要随着越来越多的PDA产品的在日常生活中的普及使用,电池充电器的使用也越来越广泛,一个好的充电器设计,不但能够实时地对充电电路的电压、电流这些关系到充电过程好坏的参数进行检测,针对这些参数的变化调整充电的电流、电压,同时还能在充电电压很小时还能够对电池进行充电。因此,本文设计了一种以MC34063直流升压电路及LM2576直流可调稳压电路为核心,AVR单片机最小系统板为控制电路,-20v范围内的不同输入电压中,通过手动调节可为一定范围内不同电压的电池充电,充电电流Ic达到大于(Es-Ec)/(Rs+Rc)的要求。该系统主要有AVRMEGA16最小系统,44700uf电容组成的电能收集储存电路,MC34063直流升压电路,LM2576直流可调稳压电路组成。系统通过44700uf电容组成的电能收集储存电路从内阻非常大(100欧)的电源中收集并储存电能,再通过AVRMEGA16最小系统于给定时间内发出脉冲使电容放电供给MC34063直流升压电路电压升压,然后由LM2576直流可调稳压电路稳压为内阻较小的()模拟电池充电。本系统具有低功耗,输出稳定可调,输入内阻大,转换效率高无需外部电源供电,低电压启动()等特点。关键词:充电器;电能收集;升压;AVRATmega16;MC34063;脉冲充电PowertocollectchargerAbstractAsmoreandmorePDAproducts,theincreasinguseineverydaylife,thebatterychargerisalsomorewidelyused,agoodbatterychargerdesign,notonlyinrealtimechargingcircuitvoltageandcurrentoftheserelationstothechargingprocessfortestingtheparametersofgoodandbadforchangesintheseparameterstoadjustchargecurrent,voltage,whilethechargevoltageofasmallbeabletorechargethebattery,suchasoutdooractivities,totakeadvantageoflow-voltageorsolarpower,,,wedesignedasystemiscenteringonMC34063direct-currentboostingcircuitandadjustableLM2576direct-,canindifferentwithincertainrange(-20v)enteringvoltage,maymovethecurrentsupplyadjustingthebatterybeingthatthecertainrangeinnerisunlikevoltagepersonally,urrentIcgreaterthan(Es-Ec)/(Rs+Rc).Besystem'sturntohaveAVRMEGA16isminimalsystemmainly,posedofcollectsstoringupcircuit,MC34063direct-currentboostingcircuit,theadjustableLM2576direct-(100Europes),AndthenboostingsupplyingwithaMC34063direct-currentboostingcircuitvoltageagainbythefactthatminimalAVRMEGA16systemissuespulseingiventimeisthatcapacitancedischarges,batterychargesfromadjustableLM2576direct--