补充—数控稳压电源 PID闭环控制带仿真源码 51单片机制作 -

#include"reg52.h"
#include"iic.h"
#include"math.h"
#include"intrins.h"
//#define unsigend char uchar
sbit pwm=P2^7; // 定义pwm脉冲
sbit CS = P1^2; //使能。
sbit CLK = P1^3;//时钟
sbit DIO = P1^4;
sbit button1=P3^0;
sbit button2=P3^1;
sbit button3=P3^2;
sbit button4=P3^3;
sbit button5=P3^4;
int pwm_add=0; //pwm增量
int PWM_control=0; //pwm占空比调节
float voltage_get=0; //获取电压值
float voltage_set=0; //设定电压值这个地方就是你要设定的电压修改这个值就可以获得想要的电压值现在是36V
float voltage_kp=0.01; //PID KP比例系数
float voltage_ki=0.1; //PID KI积分系数
float voltage_output=0; //PID输出
float voltage_error=0; //实际值与给定的误差
float voltage_error_last=0; //记录上次的误差
void timer_init();
unsigned char Get_ADC(bit ch);
void main()
{
timer_init(); //初始化定时器
while(1)
{
if(!button1) voltage_set=0;
else if(!button2) voltage_set=3;
else if(!button3) voltage_set=6;
else if(!button4) voltage_set=9;
else if(!button5) voltage_set=12;
}
}
//定时器0 用于产生PWM波
void timer_irq() interrupt 1
{
pwm_add++;
if (pwm_add==PWM_control) {pwm=0;}
else if (pwm_add>=50) {pwm=1;pwm_add=0;}
}
void timer1_irq() interrupt 3
{
TH1=(65536-50000)>>8;
TL1= 65536-50000;
voltage_get=(Get_ADC(0)/10.2);
// voltage_get=17;
voltage_error=voltage_set-voltage_get;
voltage_output+=voltage_kp*(voltage_error-voltage_error_last)
+voltage_ki*voltage_error;
voltage_error_last=voltage_error;
if (voltage_output>49) voltage_output=49;
else if(voltage_output<1) voltage_output=1;
PWM_control=(int)voltage_output;
}
//定时器初始化具体的下面的代码已经配置好了不用太关注
void timer_init()
{
TMOD=0X12;
TH0=TL0=256-200;
TH1=(65536-50000)>>8;
TL1= 65536-50000;
EA=1;ET0=1;ET1=1;TR0=1;TR1=1;
}
unsigned char Get_ADC(bit ch)
{
unsigned char i,dat1 = 0,dat2 = 0;
//启动AD转换
CS = 0; CLK = 0;
DIO = 1; _nop_(); _nop_();
CLK = 1; _nop_(); _nop_();
CLK = 0; DIO = 1; _nop_(); _nop_();
CLK = 1; _nop_(); _nop_();
CLK = 0; DIO = ch; _nop_(); _nop_();
CLK = 1; _nop_(); _nop_();
CLK = 0; DIO = 1; _nop_(); _nop_();
//从高位开始读
for(i = 0; i < 8; i++)
{
CLK = 1; _nop_(); _nop_();
CLK = 0; _nop_(); _nop_();
dat1 = (dat1 << 1)|DIO;
}
//从低位开始读
for(i = 0; i < 8; i++)
{
dat2 = dat2|((unsigned char)DIO<<i);
CLK = 1; _nop_(); _nop_();
CLK = 0; _nop_(); _nop_();
}
CS = 1;
//返回读取结果
return dat1;
}

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