Secondly , the main stuctures of the software and hardware parts of the control system are introduced . principles and realization of the main functional blocks of these two parts are illuminated . on the hardware of the system , parts of control circuit and the design and debugging of peripheral circuits are discussed thoroughly . based on the hardware circuit , the software is programmed with assembly language . dual close loop vector control weth feedback of speed and current are realized . the flow charts of main programme and pwm interrupt service routines are given . the important control strategies of vector control pmsm such as current sensint and scaling , speed sensing and scaling , bector co - ordinate transformation , generation of sine and cosine , pi regulators , svpwm vector modulation and so on are all accomplished in the pwm interrupt sevice routines . in order to unite all the variables in the programme , scaling is used 硬件方面主要论述了控制电路各部分及外围辅助电路的设计和调试。在硬件的基础上，软件采用汇编语言编程，实现了转速和电流双闭环矢量控制。给出了系统主程序和pwm下溢中断处理程序流程图， pmsm矢量控制的主要控制策略如电流采样与定标、速度采样与定标、矢量坐标变换、 sin和cos值生成、 pi调节、 svpwm波形生成等都是在pwm下溢中断服务子程序中完成的。
The paper research small - signal model of pfc circuit and build the simplified average - small - signal model of the system . the thesis develop design method of pi regulators which are applied in double closed - loops system . furthermore , the sampling algorithm of votage and current variables is also analysed in this paper 文中对pfc电路的小信号模型进行了研究，并建立了系统的简化平均小信号模型，在此基础上，以系统的动态特性和稳定性为设计指标，具体给出了双闭环系统中pi调节器的设计方法。
