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PWM（Pulse Width Modulation）是一种常见的数字信号控制技术，广泛应用于电机调速、电源转换、照明控制等领域。在这个名为“PWM.zip_numeralu2u”的压缩包中，包含了一个名为“PWM.c”的源代码文件，我们可以推断这可能是用C语言实现的PWM控制程序。以下是对这个主题的详细讲解： 1. PWM基本原理： PWM的基本思想是通过改变脉冲宽度来调整平均电压，进而控制电机速度或设备功率。在50Hz的PWM频率下，意味着每秒钟有50个完整的PWM周期。而载波频率为10kHz，这意味着在一个PWM周期内，会有10,000个高电平和低电平的切换。 2. 一个周期360个点：这里的“一个周期360个点”可能是指PWM波形在每个周期内的采样点数。在10kHz的载波频率下，一个周期是100微秒（us），360个点意味着每个点代表约27.78ns的时间间隔。这样的高采样率有助于更精确地控制PWM波形，减少噪声，并提高系统的响应速度。 3. C语言实现PWM：在“PWM.c”文件中，通常会包含设置定时器、配置PWM引脚、设定占空比等函数。C语言提供了一系列的库函数，如在嵌入式系统中常见的STM32或AVR系列MCU，可以使用HAL库或者直接操作寄存器来实现PWM。 4. 电机调速：对于50Hz的电机，通过调整PWM的占空比，可以改变电机的平均供电电压，从而改变电机的转速。占空比是指脉冲宽度相对于总周期的比例，比如50%的占空比意味着一半时间电机接收到电源，另一半时间则没有，这样可以有效地调节电机转速。 5. 设计考虑：在实际应用中，需要考虑到电机的电气特性和机械特性，以确保平稳运行。此外，还需要注意开关频率对电路的影响，例如电磁干扰（EMI）和功耗。选择合适的载波频率可以优化这些因素。 6. 编程实践：编程时，可能涉及到的任务包括初始化定时器、设置中断服务程序来更新PWM占空比、以及可能的故障处理和保护机制。在"PWM.c"中，我们可能会看到类似`TIM_Init()`、`PWM_SetDutyCycle()`等函数调用。这个“PWM.zip_numeralu2u”文件中的内容涉及了PWM技术的基本概念、C语言编程实现、电机调速策略，以及可能的硬件接口和控制算法。通过深入理解这些知识点，可以更好地设计和调试与PWM相关的控制系统。

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PWM.zip （1个子文件）

PWM.c 13KB

//包含头文件 #include"DSP2833x_Device.h" #include"DSP2833x_Examples.h" //声明变量 const int sina[360]= { //0~119 0,65,130,196,261,326,391,457,521,586, 651,715,779,843,907,970,1033,1096,1158,1220, 1282,1343,1404,1465,1525,1584,1643,1702,1760,1818, 1874,1931,1987,2042,2096,2150,2204,2256,2308,2359, 2410,2460,2509,2557,2604,2651,2697,2742,2786,2830, 2872,2914,2955,2994,3033,3071,3108,3145,3180,3214, 3247,3279,3311,3341,3370,3398,3425,3451,3476,3500, 3523,3545,3566,3586,3604,3622,3638,3653,3668,3681, 3693,3703,3713,3722,3729,3735,3740,3744,3747,3749, 3749,3749,3747,3744,3740,3735,3729,3722,3713,3703, 3693,3681,3668,3653,3638,3622,3604,3586,3566,3545, 3523,3500,3476,3451,3425,3398,3370,3341,3311,3279, //120~239 3247,3214,3180,3145,3108,3071,3033,2994,2955,2914, 2872,2830,2786,2742,2697,2651,2604,2557,2509,2460, 2410,2359,2308,2256,2204,2150,2096,2042,1987,1931, 1875,1818,1760,1702,1643,1584,1525,1465,1404,1343, 1282,1220,1158,1096,1033,970,907,843,779,715, 651,586,521,457,391,326,261,196,130,65, 0,-65,-130,-196,-261,-326,-391,-457,-521,-586, -651,-715,-779,-843,-907,-970,-1033,-1096,-1158,-1220, -1282,-1343,-1404,-1465,-1525,-1584,-1643,-1702,-1760,-1818, -1874,-1931,-1987,-2042,-2096,-2150,-2204,-2256,-2308,-2359, -2410,-2460,-2509,-2557,-2604,-2651,-2697,-2742,-2786,-2830, -2872,-2914,-2955,-2994,-3033,-3071,-3108,-3145,-3180,-3214, //240~359 -3247,-3279,-3311,-3341,-3370,-3398,-3425,-3451,-3476,-3500, -3523,-3545,-3566,-3586,-3604,-3622,-3638,-3653,-3668,-3681, -3693,-3703,-3713,-3722,-3729,-3735,-3740,-3744,-3747,-3749, -3749,-3749,-3747,-3744,-3740,-3735,-3729,-3722,-3713,-3703, -3693,-3681,-3668,-3653,-3638,-3622,-3604,-3586,-3566,-3545, -3523,-3500,-3476,-3451,-3425,-3398,-3370,-3341,-3311,-3279, -3247,-3214,-3180,-3145,-3108,-3071,-3033,-2994,-2955,-2914, -2872,-2830,-2786,-2742,-2697,-2651,-2604,-2557,-2509,-2460, -2410,-2359,-2308,-2256,-2204,-2150,-2096,-2042,-1987,-1931, -1875,-1818,-1760,-1702,-1643,-1584,-1525,-1465,-1404,-1343, -1282,-1220,-1158,-1096,-1033,-970,-907,-843,-779,-715, -651,-586,-521,-457,-391,-326,-261,-196,-130,-65 }; const int sinb[360]= { //120~239 -3247,-3279,-3311,-3341,-3370,-3398,-3425,-3451,-3476,-3500, -3523,-3545,-3566,-3586,-3604,-3622,-3638,-3653,-3668,-3681, -3693,-3703,-3713,-3722,-3729,-3735,-3740,-3744,-3747,-3749, -3749,-3749,-3747,-3744,-3740,-3735,-3729,-3722,-3713,-3703, -3693,-3681,-3668,-3653,-3638,-3622,-3604,-3586,-3566,-3545, -3523,-3500,-3476,-3451,-3425,-3398,-3370,-3341,-3311,-3279, -3247,-3214,-3180,-3145,-3108,-3071,-3033,-2994,-2955,-2914, -2872,-2830,-2786,-2742,-2697,-2651,-2604,-2557,-2509,-2460, -2410,-2359,-2308,-2256,-2204,-2150,-2096,-2042,-1987,-1931, -1875,-1818,-1760,-1702,-1643,-1584,-1525,-1465,-1404,-1343, -1282,-1220,-1158,-1096,-1033,-970,-907,-843,-779,-715, -651,-586,-521,-457,-391,-326,-261,-196,-130,-65, //240~359 0,65,130,196,261,326,391,457,521,586, 651,715,779,843,907,970,1033,1096,1158,1220, 1282,1343,1404,1465,1525,1584,1643,1702,1760,1818, 1874,1931,1987,2042,2096,2150,2204,2256,2308,2359, 2410,2460,2509,2557,2604,2651,2697,2742,2786,2830, 2872,2914,2955,2994,3033,3071,3108,3145,3180,3214, 3247,3279,3311,3341,3370,3398,3425,3451,3476,3500, 3523,3545,3566,3586,3604,3622,3638,3653,3668,3681, 3693,3703,3713,3722,3729,3735,3740,3744,3747,3749, 3749,3749,3747,3744,3740,3735,3729,3722,3713,3703, 3693,3681,3668,3653,3638,3622,3604,3586,3566,3545, 3523,3500,3476,3451,3425,3398,3370,3341,3311,3279, //0~119 3247,3214,3180,3145,3108,3071,3033,2994,2955,2914, 2872,2830,2786,2742,2697,2651,2604,2557,2509,2460, 2410,2359,2308,2256,2204,2150,2096,2042,1987,1931, 1875,1818,1760,1702,1643,1584,1525,1465,1404,1343, 1282,1220,1158,1096,1033,970,907,843,779,715, 651,586,521,457,391,326,261,196,130,65, 0,-65,-130,-196,-261,-326,-391,-457,-521,-586, -651,-715,-779,-843,-907,-970,-1033,-1096,-1158,-1220, -1282,-1343,-1404,-1465,-1525,-1584,-1643,-1702,-1760,-1818, -1874,-1931,-1987,-2042,-2096,-2150,-2204,-2256,-2308,-2359, -2410,-2460,-2509,-2557,-2604,-2651,-2697,-2742,-2786,-2830, -2872,-2914,-2955,-2994,-3033,-3071,-3108,-3145,-3180,-3214 }; const int sinc[360]= { //240~359 3247,3214,3180,3145,3108,3071,3033,2994,2955,2914, 2872,2830,2786,2742,2697,2651,2604,2557,2509,2460, 2410,2359,2308,2256,2204,2150,2096,2042,1987,1931, 1875,1818,1760,1702,1643,1584,1525,1465,1404,1343, 1282,1220,1158,1096,1033,970,907,843,779,715, 651,586,521,457,391,326,261,196,130,65, 0,-65,-130,-196,-261,-326,-391,-457,-521,-586, -651,-715,-779,-843,-907,-970,-1033,-1096,-1158,-1220, -1282,-1343,-1404,-1465,-1525,-1584,-1643,-1702,-1760,-1818, -1874,-1931,-1987,-2042,-2096,-2150,-2204,-2256,-2308,-2359, -2410,-2460,-2509,-2557,-2604,-2651,-2697,-2742,-2786,-2830, -2872,-2914,-2955,-2994,-3033,-3071,-3108,-3145,-3180,-3214, //0~119 -3247,-3279,-3311,-3341,-3370,-3398,-3425,-3451,-3476,-3500, -3523,-3545,-3566,-3586,-3604,-3622,-3638,-3653,-3668,-3681, -3693,-3703,-3713,-3722,-3729,-3735,-3740,-3744,-3747,-3749, -3749,-3749,-3747,-3744,-3740,-3735,-3729,-3722,-3713,-3703, -3693,-3681,-3668,-3653,-3638,-3622,-3604,-3586,-3566,-3545, -3523,-3500,-3476,-3451,-3425,-3398,-3370,-3341,-3311,-3279, -3247,-3214,-3180,-3145,-3108,-3071,-3033,-2994,-2955,-2914, -2872,-2830,-2786,-2742,-2697,-2651,-2604,-2557,-2509,-2460, -2410,-2359,-2308,-2256,-2204,-2150,-2096,-2042,-1987,-1931, -1875,-1818,-1760,-1702,-1643,-1584,-1525,-1465,-1404,-1343, -1282,-1220,-1158,-1096,-1033,-970,-907,-843,-779,-715, -651,-586,-521,-457,-391,-326,-261,-196,-130,-65, //120~239 0,65,130,196,261,326,391,457,521,586, 651,715,779,843,907,970,1033,1096,1158,1220, 1282,1343,1404,1465,1525,1584,1643,1702,1760,1818, 1874,1931,1987,2042,2096,2150,2204,2256,2308,2359, 2410,2460,2509,2557,2604,2651,2697,2742,2786,2830, 2872,2914,2955,2994,3033,3071,3108,3145,3180,3214, 3247,3279,3311,3341,3370,3398,3425,3451,3476,3500, 3523,3545,3566,3586,3604,3622,3638,3653,3668,3681, 3693,3703,3713,3722,3729,3735,3740,3744,3747,3749, 3749,3749,3747,3744,3740,3735,3729,3722,3713,3703, 3693,3681,3668,3653,3638,3622,3604,3586,3566,3545, 3523,3500,3476,3451,3425,3398,3370,3341,3311,3279 }; Uint32 ratioa; Uint32 ratiob; Uint32 ratioc; void Scan_Key0(void); void Scan_Key1(void); void Manage_Key0(void); void Manage_Key1(void); int m,n; unsigned long int a; unsigned long int b; unsigned long int fc=10000; float fr=50; int frmax=50; float k; //调制比 #define EPWM_DB 450 //当TBCLK=150Mhz 死区时间为3us #define EPWM_TBPRD 7500 //当TBCLK=150Mhz，增减计数频率为10K void InitEpwm1() { EPwm1Regs.TBPRD=EPWM_TBPRD; //设定PWM周期为10k EPwm1Regs.TBPHS.half.TBPHS=0x0000; //相位寄存器为0 EPwm1Regs.TBCTR=0x0000; //时基计数器为0 EPwm1Regs.TBCTL.bit.CTRMODE=TB_COUNT_UPDOWN; //增减计数 EPwm1Regs.TBCTL.bit.PRDLD=TB_SHADOW; //周期寄存器为影子装载模式（当CTR=0时，会读影子寄存器） EPwm1Regs.TBCTL.bit.PHSEN=TB_DISABLE; //禁止相位同步 EPwm1Regs.TBCTL.bit.HSPCLKDIV=TB_DIV1; //*时基时钟为 EPwm1Regs.TBCTL.bit.CLKDIV=TB_DIV1; // 150M* EPwm1Regs.CMPCTL.bit.SHDWAMODE=CC_SHADOW; //计数比较A寄存器为影子装载模式 EPwm1Regs.CMPCTL.bit.LOADAMODE=CC_CTR_ZERO; //当CTR=0时CMPA重载 EPwm1Regs.CMPA.half.CMPA=0; EPwm1Regs.AQCTLA.bit.CAU=AQ_CLEAR; //CTR=CAU时，输出低电平 EPwm1Regs.AQCTLA.bit.CAD=AQ_SET; //CTR=CAD时，输出高电平 EPwm1Regs.DBCTL.bit.OUT_MODE=DB_FULL_ENABLE; //死区模块输出使能 EPwm1Regs.DBCTL.bit.POLSEL=DB_ACTV_HIC;//下降沿翻转 EPwm1Regs.DBCTL.bit.IN_MODE=DBA_ALL; //ePWMA双边沿延时（ePWMB输入无效） EPwm1Regs.DBFED=EPWM_DB; //下降沿延时3us EPwm1Regs.DBRED=EPWM_DB; //上升沿延时3us EPwm1Regs.ETSEL.bit.INTSEL=ET_CTR_PRD; //当CTR=PRD时，触发中断 EPwm1Regs.ETSEL.bit.INTEN=1; //使能ePWM1INT EPwm1Regs.ETPS.bit.INTPRD=ET_1ST;

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