TI F28377 2P2Z(PID)设置与使用
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2P2Z是比较常用的电源环路补偿算法,这里对它的使用做一个简单的总结,便于后续使用
首先需要申明结构体:
//CNTL2P2Z
volatile CNTL_2P2Z_F_C_Coeffs coeff1;//补偿参数结构体
volatile CNTL_2P2Z_F_C_Vars var1;//控制相关结构体,var1.out就是控制的输出量
然后在main函数里面将coeff1和var1这两个要用的结构体初始化,基本上都是赋零值
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CNTL_2P2Z_F_C_VAR_INIT(var1);
CNTL_2P2Z_F_C_COEFF_INIT(coeff1);
往coeff1结构体内填充控制用的补偿参数:
coeff1.Coeff_B2 = (float)(CNTL_3p3z_B2_1); // B2
coeff1.Coeff_B1 = (float)(CNTL_3p3z_B1_1); // B1
coeff1.Coeff_B0 = (float)(CNTL_3p3z_B0_1); // B0
coeff1.Coeff_A2 = (float)(CNTL_3p3z_A2_1); // A2
coeff1.Coeff_A1 = (float)(CNTL_3p3z_A1_1); // A1
coeff1.Max = (float)CNTL_3p3z_Max_1; //Clamp Hi
coeff1.Min = (float)CNTL_3p3z_Min_1; //Clamp Min
coeff1.IMin = (float)CNTL_3p3z_IMin_1; //Clamp IMin
连接var1结构体的输入量和参考量:
var1.Ref = Vout_Ref_wInj;
var1.Fdbk = Adc_Vout1;//0-1之间的值
之后便可以在控制ISR函数里使用2P2Z进行控制了
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var1.Ref = Vout1SetSlewed;
Adc_Vout1 = ADCDRV_1ch_F_C(Vout1R); //Read Vout and convert to float
var1.Fdbk = Adc_Vout1;
if (Start_Flag == 0 && No_2p2z == 0)
{
CNTL_2P2Z_F_C(coeff1,var1);
Duty1A = var1.Out;
}
PWMDRV_1ch_F_C(BUCK_PWM_REG, BUCK_PWM_PERIOD, Duty1A);
在部分程序里还有如下代码,但是在程序里的其他地方调用到:
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struct CNTL_2P2Z_CoefStruct {
long b2;
long b1;
long b0;
long a2;
long a1;
long max;
long i_min;
long min;
};
#pragma DATA_SECTION(CNTL_2P2Z_CoefStruct1, "CNTL_2P2Z_Coef");//程序里没用到
struct CNTL_2P2Z_CoefStruct CNTL_2P2Z_CoefStruct1;//程序里没用到