基于DSP2808的轴流风机控制器设计

Design of Controller for Axial Fan Based on DSP2808

摘要:

针对工业用轴流风机,设计了基于DSP2808的智能轴流风机控制器,给出了DSP系统、CPLD系统、驱动电路、功率电路、故障检测与保护电路、单端反激变换器的设计方案；分析了风机调节流量的方法,控制器能够根据温度反馈通过PWM斩波实现风机宽范围无级调速,实现节能；控制器能够接收外部电位计、温度传感器、485总线的转速给定,表决后产生最终的转速给定；控制器具备电机绕组过热、IGBT过热、交流侧过欠压、直流侧过欠压、直流侧过流等故障检测与保护功能；实验结果表明:控制器能够实现风机匀加速软起动及起动与转速闭环之间的平稳过渡,有效降低了风机启动、运行过程的噪声,同时实现了节能。

Abstract:

According to axial fan used in industry, the intelligentized controller based on DSP2808 is designed. The DSP system, the CPLD system, the drive circuit, the power circuit, the fault detect and protect circuit, the flyback converter are presented. The method of flux regulation for the fan is analyzed. According to the temperature feedback, the controller has wide range of speed regulation by adopting PWM technique for energy saving. The controller is able to receive the speed reference by potentiometer, temperature sensor and 485 bus, the three methods are voted by DSP. The controller also has the function of motor windings over temperature, IGBT over temperature, AC over and under voltage, DC over and under voltage, DC over current detecting and protecting. The experiment results show that the uniform acceleration soft starting, the transition between starting and speed closed loop are achieved, the noise of the fan is reduced effectively and the energy saving is also realized.