用keil5在Protues软件中完成三相逆变桥SPWM调制的仿真过程的代码

以下是用Keil 5编写的三相逆变桥SPWM调制仿真代码，并在Proteus软件中进行仿真：

#include <reg51.h>
#include <intrins.h>

#define FOSC 11059200L
#define BAUD 9600
#define TIMEROUT 20
#define PWMOUT 200

typedef unsigned char uchar;
typedef unsigned int uint;

sbit ENA=P2^0;
sbit ENB=P2^1;
sbit ENC=P2^2;

uchar code sin[180]=
{
    128,131,134,137,140,143,146,149,152,155,158,161,165,168,171,174,177,180,183,186,189,192,195,198,201,204,207,210,213,215,218,221,224,227,230,233,236,239,242,244,247,250,252,255,258,260,263,266,268,271,273,276,278,281,283,285,288,290,292,294,296,298,300,302,304,306,308,309,311,313,314,316,317,319,320,321,323,324,325,326,327,328,329,330,331,332,332,333,334,334,335,335,335,336,336,336,336,336,336,335,335,335,334,334,333,332,332,331,330,329,328,327,326,325,324,323,321,320,319,317,316,314,313,311,309,308,306,304,302,300,298,296,294,292,290,288,285,283,281,278,276,273,271,268,266,263,260,258,255,252,250,247,244,242,239,236,233,230,227,224,221,218,215,213,210,207,204,201,198,195,192,189,186,183,180,177,174,171,168,165,161,158,155,152,149,146,143,140,137,134,131,128,124,121,118,115,112,109,106,103,100,97,94,90,87,84,81,78,75,72,69,66,63,60,57,54,51,48,45,42,39,37,34,31,28,25,22,19,16,13,10,8,5,2,0,253,250,247,244,241,238,235,232,229,226,223,220,217,214,211,208,205,202,199,196,193,190,187,184,181,178,175,172,169,167,164,161,158,155,152,149,146,143,140,137,134,131,128,125,122,119,116,113,110,107,104,101,98,95,92,89,86,83,80,77,74,71,68,65,62,59,56,53,50,47,44,41,38,35,33,30,27,24,21,18,15,12,9,6,3,1
};

uchar cnt=0;    //计时器中断计数器
uchar idx=0;    //正弦波表下标
uchar t_out=0;  //定时器中断时间

//定时器0初始化函数
void Timer0_Init()
{
    TMOD|=0x01; //16位定时器，工作方式1
    TH0=(65536-FOSC/12/50)/256;
    TL0=(65536-FOSC/12/50)%256;
    TR0=1;  //启动定时器
    ET0=1;  //允许定时器中断
    EA=1;   //开总中断
}

//定时器0中断服务函数
void Timer0_ISR() interrupt 1
{
    TH0=(65536-FOSC/12/50)/256; //重新赋值
    TL0=(65536-FOSC/12/50)%256;
    cnt++;
    if(cnt>=10) //10个定时器中断为1个SPWM周期
    {
        cnt=0;
        idx++;
        if(idx>=180) idx=0;
    }
    if(cnt<=sin[idx]) ENA=1; else ENA=0;
    if(cnt<=sin[idx+60]) ENB=1; else ENB=0;
    if(cnt<=sin[idx+120]) ENC=1; else ENC=0;
    t_out++;
    if(t_out>=TIMEROUT) //定时器计时到达
    {
        t_out=0;
        P1=PWMOUT;  //PWM输出
    }
}

void main()
{
    Timer0_Init();
    while(1);
}

在Proteus软件中，将MCU型号选择为AT89C51，连接相应的IO口和晶振电路，并添加一个三相逆变桥电路。然后将编写好的单片机程序烧录到MCU芯片中，并进行仿真即可。