#include
#include

typedef unsigned char BYTE;
typedef unsigned int  WORD;

sbit P13=P1^3;
sbit P14=P1^4;
sbit sd =P1^5;
//
/*
BYTE code Pwm[]=
		{  
		   5, 14, 23, 32, 41, 51, 60, 68, 77, 86,
		  94,103,111,119,127,135,142,149,156,163,
		 169,175,181,187,192,197,202,206,210,214,
		 217,220,222,225,226,228,229,230,232,232,
		 230,229,228,227,225,223,220,217,214,210,
		 206,202,197,192,187,181,175,169,163,156,
		 149,142,135,127,119,111,103,94,86,77,68,
		  60, 51, 41, 32, 23, 14,5
		 }; //77點(diǎn)	7.812k 12分頻

*/

///*
BYTE code Pwm[]=
		{
		  1,  7, 12, 16, 21, 26, 30, 35, 39, 44,
		 48, 53, 57, 62, 66, 71, 75, 79, 84, 88,
		 92, 97,101,105,109,113,117,121,125,129,
		133,136,140,144,147,151,154,158,161,164,
		168,171,174,177,180,183,185,188,191,193,
		196,198,200,203,205,207,209,211,213,214,
		216,218,219,221,222,223,224,225,226,227,
		228,228,229,229,230,230,230,230,231,230,
		230,230,229,229,228,227,226,225,224,223,
		222,221,219,218,216,215,213,211,209,207,
		205,203,201,199,196,194,191,189,186,183,
		180,178,175,171,168,165,162,159,155,152,
		148,145,141,137,134,130,126,122,118,114,
		110,106,102, 98, 93, 89, 85, 81, 76, 72,
		 67, 63, 58, 54, 49, 45, 40, 36, 31, 26,
		 21, 17, 12,  8,  1		
		}; //155點(diǎn) 15.625k 6分頻

//*/

WORD Flag=0,ZF=0,i=0;
//----函數(shù)聲明----
void init();
void delay();


//-----主函數(shù)-----
void main()
{
	sd =1;
	P13=0;
	P14=0;
	init();	
	delay();
	sd =0;
	while(1);
	
}


void init()
{
	AUXR	= 0x80;
	TMOD	= 0x02;
//	TL0		= 244;	//7.812K 12分頻	
//	TH0		= 244;	//7.812K 12分頻
	TL0		= 250;	//15.625K 6分頻	
	TH0		= 250;	//15.625K 6分頻
	TR0		= 	 1;
	ET0		=	 0;

//----PCA初始化----
	CCON	=	 0;

	CL		=	 0;
	CH		=	 0;
	CMOD	= 0X04;

	CCAP0H	= 5;
	CCAP0L	= 5;
	CCAPM0	= 0X53;
/*
	CCAP1H	= 128;
	CCAP1L	= 128;
	CCAPM1	= 0x00;
*/
	CR		=	 1;
	EA		=	 1;
}

void PCAPWM0() interrupt 7 using 1
{
	CCF0=0;
	CCF1=0;
	i++;
//	if(i==7812)	 //7.812K
	if(i==15625) //15.625K
	{
	P0=~P0;
	i=0;
	}
//	if(Flag>=77) //7.812K
	if(Flag>=155)//15.625K
	{
//		CR=0;
		Flag=0;
		ZF=!ZF;
		switch(ZF)
		{
			case(1):
			{				
				sd	   = 1;
				_nop_();
				P13    = 0;
				CCAPM0 = 0x00;
				CCAPM1 = 0x53;
				sd     = 0;
			}break;
			case(0):
			{
				sd	   = 1;
				_nop_();
				P14    = 0;
				CCAPM0 = 0x53;
				CCAPM1 = 0x00;
				sd     = 0;
			}break;		
		}
//		CR=1; 
			
	}
	switch(ZF)
	{
		case(0):
		{
			CCAP0H=CCAP0L=(256-Pwm[Flag]);
		}break;
		case(1):
		{
			CCAP1H=CCAP1L=(256-Pwm[Flag]);
		}break;
	}
	Flag++;

}
void delay(void)  	//100ms延時
{
    unsigned char a,b,c;
    for(c=65;c>0;c--)
        for(b=104;b>0;b--)

	



	



	

for(a=176;a>0;a--);
    _nop_();  		//if Keil,require use intrins.h
    _nop_();  		//if Keil,require use intrins.h
}

這是我用幾天時間憋出來的程序，放在橋上能正常運(yùn)行，輸出加大電阻也有矩形波輸出，現(xiàn)在就差濾波部分。

手上電容電感種類很少，大致算了一下 就用了個10mh電感和六個0.47uf電容并聯(lián)濾波，看大致波形。。求可靠的計(jì)算算法，然后重新買元器件。。

直流輸入：30v  載波頻率：15.625k 調(diào)制比0.9 輸出電壓有效值大約24v

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