摘要
提出了一种基于数字信号处理器(DSP)的数字开关功率放大器设计方法,采用DSP实现了电流闭环控制算法,产生脉冲宽度调制(PWM)信号驱动功率桥从而实现期望电流,阐明了PWM信号的产生逻辑与不同调制模式下PWM的实现方式.采用傅里叶级数对线圈两端电压进行展开,建立了数字开关功率放大器的等效模型,并进行仿真分析.搭建了数字开关功率放大器实验平台,实验结果验证了提出的设计方法的有效性,且基于等效数学模型的仿真结果与实验结果较为接近,其模型能为功率放大器设计作参考.
Digital switching power amplifier design method based on digital signal processor (DSP) was put forward,in which current closed-loop control algorithm was implemented in DSP and pulse width modulation (PWM)signals were generated to drive power bridge for implementing desired cur-rent.The PWM signal generation logic and implementation in different modulation modes was dis-cussed.Based on equivalent model of switching power amplifier established by the Fourier series ex-pansion of voltage across the coil,simulation analysis was carried on.Experimental platform for digit-al switching amplifier was built for relevant experiment,which proved the validity of the proposed de-sign method.Simulation results based on equivalent mathematical model are close to the experimental results,and it means the model can guide the power amplifier design.
出处
《华中科技大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2015年第S1期493-496,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51205300
51275368)
关键词
磁悬浮
数字信号处理器
开关功率放大器
傅里叶级数
等效数学模型
脉冲宽度调制
magnetic levitation
digital signal processor
switching power amplifier
Fourier series
equivalent mathematical model
pulse width modulation