有效地控制MOSFET的尖峰脉冲.

zack!了不起!顶!

谢谢,xzszrs你很了不呀. 有很多电源方面的东西想和你共同合作开发呢.相互学习、批评指正、共同发展!

这么好的思路和参考模型咋就回帖的朋友这么少呢?
好吧.就把它翻一点吧.希望我抛砖引玉的想法不要落空.
也希望得到一点感觉的朋友发表一下意见OK?WELL,LET'S GO!

/*****************************************************************************
* Filename: MAIN.C
******************************************************************************
*
* Author: Dave Karipides
* Company: APS, Inc.
* Date: 3-3-97
* Compiled Using MPLAB-C Rev 1.21
*       编译平台:MAPLAB-C Rev1.21(我用HT-PICC9.05L)
******************************************************************************

******************************************************************************
*
* Description: The main routine calls all the functions for generating
* an OPEN_LOOP or FEEDBACK sine wave of either 50 or 60 Hz.
*       软件描述:主程序调用函数产生开环和闭环调节的正弦波可设置50HZ或60HZ  
******************************************************************************
*

*
*
******************************************************************************/

/*****************************************************************************
* main()
*
* Description: The main routine initializes the registers and loops
* forever.  All control is handled in the TMR0 INT
* routine.
*       主程序描述:主程序初始化个积存器组后台循环.所有控制操作在TMRO中断子程序处理.
*
* Input Variables: NONE
*       输入变量:没有
* Output Variables: NONE
*       输出变量:没有
*
******************************************************************************/

//#define OPEN_LOOP
#define FEEDBACK
//#define 50Hz
#define 60Hz

#pragma option v
#include <17c43.h>
#include
#include

#ifdef OPEN_LOOP          
// This table yields Full VRMS input 最大额定电压输入表,测试用
unsigned char const pwmtab[32]={0,25,50,74,98,120,142,162,180,197,212,
225,235,244,250,254,255,254,250,244,235,
225,212,197,180,162,142,120,98,74,50,25};
#endif
#ifdef FEEDBACK
// This table yields slightly less than Full VRMS input 调节电压输入表
unsigned char const pwmtab[32]={0,20,40,60,79,97,114,131,145,159,171,
181,189,197,202,205,206,205,202,197,189,
181,171,159,145,131,114,97,79,60,40,20};
#endif

long read_ad(unsigned char); // Prototype for A/D converter function声明A/D采样函数

unsigned char index; // Index into the sinewave reference table查表顺序寄存器
unsigned char sign; // Flag used to unfold sinewave reference table正弦表输出标志
long reference; // Value of the sinewave refrence after unfolding输出电压参考值
unsigned char reference_lo  @ reference; // V1.21 of Compiler does not type cast unsigned
// char to long so we will write to low byte separately把电压的低位字节定义在电压寄存器的低位字节
long out_volt; // Magnitude of the output voltage;输出电压大小
long y; // Variables used in compensation routine;电压补偿子程序所用的变量
long yold;
long x;
long xold;
long ad_value; // A/D Converter Value;AD转换数值寄存器

void main(void)
{
CLRWDT();//清看门狗,一般PIC初始化之前需要加次命令,以免不必要的中断
PORTC = 0; // Zero out portc latches;C端口积存器清零
DDRC = 0x22; // Set up Data direction register for C;PORTC端口方向积存器定义
DDRB = 0; // Set up Data direction register for B;PORTB端口方向积存器定义
PR1 = 0xFF; // Setup PR1 register (24.4Khz @ 25Mhz clk)设置PWM频率在25MHZ时,PR1=0XFF,则PWM频率为24.4KHZ.具体计算见手册
PW1DCL = 0; // Set low bits of PWM to 0
PW1DCH = 0; // Init PWM duty cycle to 0;初始化占空比为零

T0STA = 0x20; // Configure Timer0 prescaler;设置定时期T0预分频
INTSTA.T0IE = 1; // Enable Timer 0 interrupt;开定时器TO中断
TCON1.TMR1CS = 0;
TCON1.T16 = 0;
TCON2.TMR1ON = 1; // Start timer 1 (PWM timer);开定时器T1
TCON2.PWM1ON = 1; // Turn on the PWM,开定TMR2,PWM输出
CPUSTA.GLINTD = 0; // Unmask the interrupts;开所有中断

index = 0; // Initialize variables;个变量初始化
sign = 0;
y = 0;
yold = 0;
x = 0;
xold = 0;
PORTC.0 = 1; // Enable the Inverter;PORTC.0逆变允许开关,允许输出
while(1); // Loop forever, execute in INT Routine;前台循环等待中断.......
}

#ifdef FEEDBACK//预编译命令,反馈闭环情况下TMRO中断处理.
__TMR0() // Timer  interrupt
{
T0STA.T0CS = 0; // Stop timer
PORTB.7=1;
#ifdef 60Hz
TMR0L=0xA5;
TMR0H=0xF9; // Make Timer0 interrupt at 3.84KHz for 60Hz output
#endif
                                         TMRO每0.26ms中断一次,0.26*32=8.333...ms,为60HZ半周
#ifdef 50Hz
TMR0L=0x5F; // Make Timer0 interrupt at 3.20KHz for 50Hz output
TMR0H=0xF8;                      TMR0每0.3125ms中断一次,0.3125*32=10ms,为50HZ半周
#endif
T0STA.T0CS = 1; // Start timer开定时器件
CLRWDT();//清看门狗,防止死机

reference = 0; // Clear Reference Value清除参考电压
reference_lo = pwmtab[index]; // Lookup the value of the sinewave reference;查表,得到标准参考电压表数据,用于采样比较

if (!index) // Toggle Sign Every Cycle Through table;每一次查表循环完毕标志取反,用以确定正负半周波形
sign = ~sign;
++index; // Increment index;正弦表顺序取值
if (index == 32) // If end of table, reset counter;32个点查完后清index
index = 0;
if (sign) // If negative going wave;假如正输出负半周波形
{
reference = ~reference; // V1.21 of Compiler negate (-ref) doesn't work for
reference = reference + 1;// ref<=0 ;C编译器版本不同此运算不同
}
ad_value = read_ad(0);采样RA0端口数值,也即32个中断采样输出电压,就是半周取32个电压输出点.
out_volt = ad_value - 512; // Read output voltage (512 counts=0 volts out)采样输出电压在512=0.

// Form the expression y = yold + (0.09261 * (x + xold));根据PID简化公式稳定调节输出电压
// Where yold, xold is the value of y, x from the previous sample;yold,xold为前次采样到的y,x值
// x is the , formed by the difference between the output;X为偏差信号,由输出电压波动数值和参考电压的差值来确定
// of the inverter and the reference signal.
x = out_volt - reference;//x等于当前输出电压(有AD采样得到)减取参考电压
y = ((x + xold) * 24);//
y = y / 256;//即简化计算0.09261 * (x + xold)
y = y + yold;//逼近
if (y >= 0)
{
PORTC.2 = 0; // Set positive going cycle;控制正半周输出
} else
{
PORTC.2 = 1; // Set negative going cycle;控制负半周输出
y = ~y;
y = y + 1;
}
if (y > 255)
y = 255; // Limit y;限制Y最大数值,不限制会益处复位,输出电压数值波形重创.
PW1DCH = y; // Update duty cycle更新
xold = x; // Store previous sample's state保存当前采样数值
yold = y;
PORTB.7=0;
}
#endif
//采用开环输出方案,一般作测试用
#ifdef OPEN_LOOP
// The inverter runs in an open loop mode with OPEN_LOOP defined.
__TMR0() // Timer interrupt
{
T0STA.T0CS = 0; // Stop timer
#ifdef 60Hz
TMR0L=0xA5;
TMR0H=0xF9; //Make Timer0 interrupt at 3.84KHz for 60Hz output
#endif
#ifdef 50Hz
TMR0L=0x5F; //Make Timer0 interrupt at 3.20KHz for 50Hz output
TMR0H=0xF8;
#endif
T0STA.T0CS=1; //Start timer
CLRWDT();

PW1DCH = pwmtab[index];
if (!index)
{
PORTC.0 = 0; // Gate Drive off
PORTC.2 = ~PORTC.2; // Flip Pos/Neg bit
PORTC.0 = 1; // Gate Drive on
}
++index;
if (index == 32)
index = 0;
PORTC.3 = ~PORTC.3; // Toggle bit to test freq.
}
#endif

long read_ad(unsigned char channel)//读AD,CHIP
{
long result;

PORTC.6 = 1; // Write bit high
PORTC.7 = 1; // Read bit high
PORTC.4 = 1; // Chip select high
DDRD = 0; // Make PORTD an output
PORTD = 0x04; // Single ended mode signed 10 bit chan 0 Right justified
PORTC.4 = 0; // Select chip
PORTC.6 = 0; // latch command word int A/D
PORTC.6 = 1; // Start conversion
PORTC.4 = 1; // Deselect chip
while (PORTC.5); // Wait for conversion to complete
DDRD = 0xFF; // Make PORTD an input
PORTC.4 = 0; // Select chip
PORTC.7 = 0; // Read high byte
*( ((unsigned char*)&result) + 1) = PORTD;
PORTC.7 = 1;
PORTC.4 = 1;
PORTC.4 = 0;
PORTC.7 = 0; // Read low byte
*( ((unsigned char*)&result) ) = PORTD;
PORTC.7 = 1;
PORTC.4 = 1; // Reset chip select lines
return (result); // Return data
}

pic17c43的资料吧

sine波输出的算法.基于PIC16系列的ups控制核心.
有些朋友对于MCU或DSP产生正弦波的算法没接触过,在此供大家思考!

为啥下载不了?

照抄了MICROCHIP公司的源代码,其实源代码里有很多缺陷.并且现在如果做大功率的,则没有人使用这种程序了,属于比较原始的,相当于10年前的水平.

1,请问缺陷在什么地方,请说明,1,2,3,4.
2,的确这是MICROCHIP的部分代码,我不知道你所谓照抄是什么意思?
  就直接拿来用就可以吗?
3,所谓相当于10前的水平,现在的水平是什么样的?不要看到DATA 3-3-97,心里就这么浮躁了.
4,一种算法的借鉴思路是要我们领会之后灵活运用的,不动动脑子是不
  会有长进的.
5,有比半波实时采样更先进的PID算法,你也要那出来说啊!否着那是放
  屁了.
呵呵......