直流电子负载

..>直流电子负载一、根本要求〔1〕负载工作模式：恒压(CV)、恒流(CC)两种模式可选择。〔2〕电压设置及读出范围：1.00V～20.0V。〔3〕电流设置及读出范围：100mA～3.00A。〔4〕显示分辨力及误差：至少具有三位数，相对误差小于5%。二、总体方案论证与设计显显示按键输入单片机AD转换ＤＡ转换电流检测电压检测恒压恒流利用A/D转换把模拟信号转换为数字信号，在利用单片机程控来修改电压电流参数，此方案准确度高，操作技术要求很高，节省时间。并且用ＤＡ采集显示测量值，比较得出结论。1．定电流模式〔CCmode〕在定电流工作模式时，电子负载所流入的负载电流依据所设定的电流值而保持恒定，与输入电压大小无关，即负载电流保持摄定值不变。２．定电压模式〔CVmode〕在定电压工作模式时，电子负载所流入的负载电流依据所设定的负载电压而定，此时负载电流将会增加直到负载电压等于设定值为止，即负载电压保持设定值不变。电源模块根本电路图单片机模块根本电路三、测试及分析测试原始数据１.恒流模式数据测量模式设定值〔A〕测量值1(A)测量值2(A)测量值3(A)工作电压(V)工作电压(V)工作电压(V)恒流恒流恒流恒流恒流２.恒压模式数据测量模式设定值(V)测量值1(V)测量值2(V)测量值3(V)工作电压(V)工作电压(V)工作电压(V)恒压恒压3.163.083.14恒压8.969.04恒压15.24恒压19.8421.12四、附录根本程序恒流模块#include<reg52.h>#include<intrins.h>#defineuintunsignedint#defineucharunsignedcharsbitrs=P2^7;sbitE=P2^6;sbitadwr=P2^5;sbitadrd=P2^4;floatadval;longinttemp;voiddelay(uintz)//延时子程序{uint*,y;for(*=z;*>0;*--)for(y=110;y>0;y--);}write_(uchar)//写命令{rs=0;P0=;delay(5);E=1;delay(5);E=0;}write_data(uchardat)//写数据{rs=1;P0=dat;delay(5);E=1;delay(5);E=0;}init()//液晶初始化{E=0;write_(0*38);write_(0*0c);write_(0*06);write_(0*01);write_(0*80+3);}voidDisplay_Resulti(uchardac)//恒流设定值子程序{floatdb=0.0; ucharshi=0,ge=0,*s=0,**s=0;P3=dac; db=dac*3.00/158.00; shi=(int)db/10; ge=(int)db%10; db*=10.0;*s=(int)db%10; db*=10.0;**s=(int)db%10;write_(0*80+1);delay(2);write_data('c');delay(2);write_data('u');delay(2);write_data('r');delay(2);write_data('r');delay(2);write_data('e');delay(2);write_data('n');delay(2);write_data('t');delay(2);write_data(0*3a);delay(2);if(shi==0){write_data(0*20);delay(2);}elsewrite_data(0*30+shi);delay(2);write_data(0*30+ge);delay(2);write_data(0*2e);delay(2);write_data(0*30+*s);delay(2);write_data(0*30+**s);delay(2);}voidDisplay_Resulti1(floatadval)//测量电流值子程序{ucharge,*s,shi,**s;temp=(longint)(adval*105/51);shi=temp/1000;ge=temp/100%10;*s=temp/10%10;**s=temp%10;write_(0*80+0*40+1);delay(2);write_data('C');delay(2);write_data('U');delay(2);write_data('R');delay(2);write_data('R');delay(2);write_data('E');delay(2);write_data('N');delay(2);write_data('T');delay(2);write_data(0*3a);delay(2);if(shi==0){write_data(0*20);delay(2);}elsewrite_data(0*30+shi);delay(2);write_data(0*30+ge);delay(2);write_data(0*2e);delay(2);write_data(0*30+*s);delay(2);write_data(0*30+**s);delay(2);}voidADC()//启动AD转换{adwr=1;_nop_();adwr=0;_nop_();adwr=1;P1=0*ff;adrd=1;_nop_();adrd=0;_nop_();adval=P1;adrd=1;}voidmain()//主程序{init();TMOD=0*02;//定时器初始化 TH0=0*6f; TL0=0*00; IE=0*82; TR0=1;while(1)//显示模块{ucharkey=0; bitkeyflag=1; uintdac=0; Display_Resulti(dac);while(1)//键盘扫描控制显示 {Display_Resulti1(adval);ADC(); key=P2&0*0f;switch(key) { case0*0e: if(keyflag){ dac=0; Display_Resulti(dac);keyflag=0; } break;case0*0d: if(keyflag){dac+=10; Display_Resulti(dac); keyflag=0; } break;case0*0b: if(keyflag){dac-=10; Display_Resulti(dac); keyflag=0; } break;case0*07: if(keyflag){ dac=158; Display_Resulti(dac);keyflag=0; } break;case0*0f:keyflag=1;break; } }}}恒压模块#include<reg52.h>#include<intrins.h>#defineuintunsignedint#defineucharunsignedcharsbitrs=P2^7;sbitE=P2^6;sbitadwr=P2^5;sbitadrd=P2^4;floatadval;longinttemp;voiddelay(uintz)//延时子程序{uint*,y;for(*=z;*>0;*--)for(y=110;y>0;y--);}write_(uchar)//写命令{rs=0;P0=;delay(5);E=1;delay(5);E=0;}write_data(uchardat)//写数据{rs=1;P0=dat;delay(5);E=1;delay(5);E=0;}init()//液晶初始化{E=0;write_(0*38);write_(0*0c);write_(0*06);write_(0*01);write_(0*80+3);}voidDisplay_Resultu1(floatadval)//恒压设定值子程序{ucharge,*s,shi,**s;temp=(longint)(adval*110/51);temp=temp*4;shi=temp/1000;ge=temp/100%10;*s=temp/10%10;**s=temp%10;write_(0*80+0*40+1);delay(2);write_data('V');delay(2);write_data('O');delay(2);write_data('L');delay(2);write_data('T');delay(2);write_data('A');delay(2);write_data('G');delay(2);write_data('E');delay(2);write_data(0*3a);delay(2);if(shi==0){write_data(0*20);delay(2);}elsewrite_data(0*30+shi);delay(2);write_data(0*30+ge);delay(2);write_data(0*2e);delay(2);write_data(0*30+*s);delay(2);write_data(0*30+**s);delay(2);}voidDisplay_Resultu(uchardac)//测量电压子程序{floatdb=0.0; ucharshi=0,ge=0,*s=0,**s=0;P3=dac; db=dac*20.00/255.00; shi=(int)db/10; ge=(int)db%10; db*=10.0;*s=(int)db%10; db*=10.0;**s=(int)db%10;write_(0*80+1);delay(2);write_data('v');delay(2);write_data('o');delay(2);write_data('l');delay(2);write_data('t');delay(2);write_data('a');delay(2);write_data('g');delay(2);write_data('e');delay(2);write_data(0*3a);delay(2);if(shi==0){write_data(0*20);delay(2);}elsewrite_data(0*30+shi);delay(2);write_data(0*30+ge);delay(2);write_data(0*2e);delay(2);write_data(0*30+*s);delay(2);write_data(0*30+*s);delay(2);}voidADC()//启动AD转换{adwr=1;_nop_();adwr=0;_nop_();adwr=1;P1=0*ff;adrd=1;_nop_();adrd=0;_nop_();adval=P1;adrd=1;}voidmain()//主程序{init();TMOD=0*02;//定时器初始化 TH0=0*6f; TL0=0*00; IE=0*82; TR0=1;while(1)//显示模块{ucharkey=0; bitkeyflag=1; uintdac=0; Display_Resultu