基于PIC18F4431的逆变电源控制系统

Inverter control system based on PIC18F4431

为获得设定频率与电压的优质正弦交流电,设计了一种以Microchip Technology公司生产的PIC18F4431单片机为核心的逆变电源控制系统。该电源以220 V、50 Hz交流电压为输入,通过整流和逆变组合电路,来实现逆变。硬件设计采用了自举式浮充驱动电路、基于真有效值转换芯片的检测电路、RCD缓冲电路,并给出了硬件设计原理图。软件设计采用单极性等面积脉宽调制(PWM)法调制、采样、中断的方式进行稳压调节,并给出了软件流程图。实验结果表明该逆变电源数字化控制方案切实可行、稳压特性好、成本低、精度高,并已成功应用于多种设备。

Aiming at obtaining a high-quality sine wave,which frequency and voltage was set by user,an inverter control system based on PIC18F4431 microcontroller produced by Microchip Technology Company was designed.The input of the supply was 220 V、50 Hz AC,through rectifier and inverter circuit,to realize inverter.The hardware was designed by using a bootstrap drive circuit of floating channel,a detection circuit based on RMS-DC chip,RCD buffer circuit,the schematic was given.The software was designed by utilizing a unipolar equal-area pulse width modulation（PWM） modulation method,sampling and interrupt mode to regulate the voltage,the flow chart was presented.The test result indicates that the design of digital control in inverter supply is feasible and has a good regulation characteristics、low cost、high precision,and has been successfully used in various device.