全数字化双向DC_DC变换器的分析和设计.pdfVIP

37 6 Vol. 37, No. 6 2003 12 Power Electronics December , 2003 全数字化双向DC/DC变换器的分析和设计 , , ( 中国科学院电工研究所, 北京 100080) :分析了电压和电流两种控制模式, 基于电流模式提出一种具有 压、 流、 功率控制等多种功能的控 制器。详尽阐述了数字控制系统的采样速率、AD 转换器位数、DPWM 分辨率和开关频率的设计原则, 提出了非同 步采样检测方法。针对DC/ DC 变换器强的非线性、时变特性, 提出一种新型变参数滞环 PID 调节器, 改善系统稳 定性。采用DSP2TMS320F243 作为控制核心, 设计了一台额定功率为 5 kW 的双向DC/ DC 变换器装置。实验结 果证明, 系统性能优良, 可有效用于电动汽车等领域。 :数字控制; 脉宽调制; 电动汽车/ 直流2 直流变换器 :TM46 : A : 1000- 100X(2003) 05- 0013- 04 Analysisand Design of Digitally Controlled Bi2directionalDC/DCConverter XU Hai2 ing, WEN Xu2hui, KONG Li ( Institute of Electrical Engineering Chinese Academy of Sciences, Beij ing 100080, China) Abstract:This article resents an analysis of voltage and current control modes of DC/ DC converter and ro oses a mult2i ur ose controller working in constant voltage, constant current, constant ower states alterable.Also the determina2 tion of sam ling rate of the digital control unit,AD conversion bits, DPWM resolution andt he rinci le of switch frequency are discussed. Meanwhile, an asynchronous sam ling method is ro osed to ensure the recision of feedback signal.Aim at t he nonlinear , arameter2 changing and time2variant high2 frequency switch system, a new ty e of PID regulator is used to im rove the system stability and dynamic erformance. Finally, A 5 kW b2i directional DC/ DC converter is built with the DSP2T I320F243. Ex eriment shown that the system has excellent ro erties and can be used in areas like EV. Key words:digit ally controlled;PWM;Electrical Vehicle/ DC2DC converter 1 设计统一的硬件平