STM32定时器输出带有死区时间的PWM波形

最新推荐文章于 2025-07-10 11:23:38 发布

dazhou158

最新推荐文章于 2025-07-10 11:23:38 发布

阅读量2.4w

点赞数 5

CC 4.0 BY-SA版权

分类专栏： STM32F4 文章标签： STM32F4 定时器死区时间相位差刹车控制

本文链接：https://blog.youkuaiyun.com/dazhou158/article/details/8806174

该博客主要介绍了如何使用STM32F4通过定时器配置，生成具有1us死区时间和3us相位差的50KHz PWM波形。在内容中，博主提供了具体的`main.c`代码，并给出了代码下载链接。

要求得到下列波形，死区时间为1us，CH1，CH2，CH3之间的相位差为3us，频率为50KHz

main.c

/*********************************************
    标题：定时器输出带有死区时间的PWM波形
    软件平台：MDK-ARM Standard Version4.70
    硬件平台：stm32f4-discovery	
    主频：168M
	Periph_Driver_version: V1.0.0
    
    描述：用一个定时器(TIM1)，输出带有死区时间的PWM波形，要求：死区时间为1us，CH1，CH2，CH3之间的相位差为3us，频率为50KHz
		  代码参考自STM32F4-Discovery_FW_V1.1.0\Project\Peripheral_Examples\TIM_ComplementarySignals

    author：大舟
    data：2013-04-15
**********************************************/


#include "stm32f4_discovery.h"


TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
uint16_t TimerPeriod = 0;
uint16_t Channel1Pulse = 0, Channel2Pulse = 0, Channel3Pulse = 0;

/* Private function prototypes */
void TIM_Config(void);


int main(void)
{
	/*!< At this stage the microcontroller clock setting is already configured,
	this is done through SystemInit() function which is called from startup
	file (startup_stm32f4xx.s) before to branch to application main.
	To reconfigure the default setting of SystemInit() function, refer to
	system_stm32f4xx.c file
	*/

	/* TIM1 Configuration */
	TIM_Config();

	/* -----------------------------------------------------------------------
	1/ Generate 3 complementary PWM signals with 3 different duty cycles:

	In this example TIM1 input clock (TIM1CLK) is set to 2 * APB2 clock (PCLK2),
	since APB2 prescaler is different from 1 (APB2 Prescaler = 2, see system_stm32f4xx.c file).
	TIM1CLK = 2 * PCLK2
	PCLK2 = HCLK / 2
	=> TIM1CLK = 2*(HCLK / 2) = HCLK = SystemCoreClock

	To get TIM1 counter clock at 168 MHz, the prescaler is computed as follows:
	Prescaler = (TIM1CLK / TIM1 counter clock) - 1
	Prescaler = (SystemCoreClock / 168 MHz) - 1 = 0

	The objective is to generate PWM signal at 17.57 KHz:
	- TIM1_Period = (SystemCoreClock / 17570) - 1

	To get TIM1 output clock at 17.57 KHz, the period (ARR) is computed as follows:
	ARR = (TIM1 counter clock / TIM1 output clock) - 1 = 9561
	

	The Three Duty cycles are computed as the following description:

	TIM1 Channel1 duty cycle = (TIM1_CCR1/ TIM1_ARR)* 100 = 50%
	TIM1 Channel2 duty cycle = (TIM1_CCR2/ TIM1_ARR)* 100 = 25%
	TIM1 Channel3 duty cycle = (TIM1_CCR3/ TIM1_ARR)* 100 = 12.5%

	The Timer pulse is calculated as follows:
	- TIM1_CCRx = (DutyCycle * TIM1_ARR)/ 100

	2/ Insert a dead time equal to (11/SystemCoreClock) ns	//这句不对，示波器里观测也不对，不是这样算的。
	
	正确的deadtime的计算方法（经理论与示波器测试成功）
	TIM_BDTRInitStructure.TIM_DeadTime=255 //这句设定的就是寄存器TIMx_BDTR的后8位，即DTG[7:0],所以最大值为255
	从下面的代码中的“第五步”中，实际上就相当于TIM1->BDTR=0x71FF;
	
	查看"STM32中文参考手册2009.pdf"的TIMx_BDTR(第248页)，列寄存器TIMx_BDTR的后8位如下：
	位7:0	UTG[7:0]: 死区发生器设置 (Dead-time generator setup) 
			这些位定义了插入互补输出之间的死区持续时间。假设DT表示其持续时间： 
			DTG[7:5]=0xx => DT=DTG[7:0] × Tdtg，		Tdtg = Tdts； 
			DTG[7:5]=10x => DT=(64+DTG[5:0])