标题: 用于混和电源系统之前端数位脉宽调变直流转换器研制
Implementation of Front-End DPWM DC-DC Converter for Hybrid Power System
作者: 游闳名
Yu, Hung-Ming
董兰荣
Dung, Lan-Rong
电控工程研究所
关键字: 直流转换器;数位脉宽调变;数位电源;DC-DC converter;DPWM;Digital power
公开日期: 2013
摘要: 本论文旨在研发微控器为基础之直流至直流转换器,用以提供混合式电源管理系统之前端直流电源,其锁定输入电流之特性可以有效避免燃料电池因电压过低而造成损坏的可能性。数位化控制系统具有高稳定性、高抗杂讯能力与优良的可规划特性,同时应用在直流对直流转换器可以避免类比元件老化造成性能衰减的问题。本论文涵盖之系统分成电源转换器、数位控制补偿器、与混合式电源管理系统等三大架构。首先,在电源转换器的部分为前级的升压直流对直流转换器电路,为燃料电池端对锂电池端之直流转换器。其次,对于数位控制补偿器采用Microchip公司的dspic微控制器(型号:33FJ06GS202),利用该晶片强大控制与运算能力稳定实现type-III补偿器;再者,利用dspic微控制器内建之高精度类比对数位转换器撷取电压物理量,进行闭回路控制并产生高精度数位脉宽调变信号,使直流电源可以达到稳定输出。最后,于混合式电源管理系统,以双锂电池为主、质子交换膜燃料电池(PEMFC)为辅供应负载能量。而锂电池切换系统用以避免锂电池长时间保持在高容量或者低容量的状态,以延长该电池组寿命。
In this thesis, an implementation of microcontroller based front-end DC-DC converter for hybrid power management system is presented. This DC-DC makes Proton Exchange Membrane Fuel Cell (PEMFC) not to be damaged at low voltages by controlling the input current. Besides, a digital control system has high stability, high noise immunity and can be programmed for any situation. For a typical DC-DC converter, the aged passive components can be a problem that causes the performance to decrease. On the other hand, a digital DC-DC converter can avoid this problem.
In this system, DC-DC converters with digital microcontroller and a power management are included. A boost converter implements power conversion for dual Li-ion battery packs and a proton exchange membrane fuel cell (PEMFC). The converter is controlled by a Microchip dspic33FJ06GS202 microcontroller with a digitalize type-III compensator. This device has high-speed 10-bit ADCs and high-speed PWM Modules in order to sense output voltage and generate PWM signals more precisely. A switching Li-ion battery circuit is also be monitored to avoid batteries in a high Depth of discharge (DoD) situation.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT079912504
http://hdl.handle.net/11536/73641
显示于类别:Thesis