stm32关于带死区时间的互补PWM输出-Toy模板网

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1.互补PWM输出简介

在使用stm32输出PWM波形时,笔者所用的stm32f103zet6中的高级定时器TIM1和TIM8可以输出互补的PWM波形,使用互补的PWM波常见与一些半桥电路和全桥电路控制中,使用MCU自带的高级时钟可以简便的解决互补PWM输出问题。
笔者在控制半桥电路中应用了MCU自带的TIM1时钟CH_1和CH_1N的输出带死区时间的互补PWM波形，输出稳定。

2.互补PWM波输出设置

/**
 * @brief 	互补的PWM输出初始化.
 * @param  	arr:计数总数;
			psc:预分频;
			ccr1_val:计数ccr1后翻转电平;
			deadtime:死区时间.
 * @retval 	None.
 * @msg	   	PWM输出频率为72MHz/(arr+1)*(psc+1)此处设置PWM频率为100KHz;
			死区时间设置为16*1/72us=222.2ns(0x10).
 */
void TIM1_PWM1_DeadtimeInit(u16 arr,u16 psc,u16 CCRx_val,u16 deadtime)
{
    GPIO_InitTypeDef GPIO_InitSturcture;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB, ENABLE);

    GPIO_InitSturcture.GPIO_Pin = GPIO_Pin_8 ;
    GPIO_InitSturcture.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitSturcture.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitSturcture);
	
	GPIO_InitSturcture.GPIO_Pin = GPIO_Pin_13 ;
    GPIO_InitSturcture.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitSturcture.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitSturcture);
 
    TIM_TimeBaseInitStructure.TIM_Period = arr;      	  					/*设置在自动重装载周期值*/
    TIM_TimeBaseInitStructure.TIM_Prescaler = psc;	 	  					/*设置预分频值*/
    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;			/*向上计数模式*/
    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;				/*死区、输入滤波、输入采样不分频*/
    TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0x00;    				/*重复计数器设置为0*/
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStructure);
		
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;			 			/*PWM1输出方式*/
    TIM_OCInitStructure.TIM_Pulse = CCRx_val;								/*计数到CCRx_val电平反转，即设置CCRx的值*/
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;				/*输出通道电平极性配置,决定输出的有效电平*/
    TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCPolarity_High;				/*互补输出通道电平极性配置,决定输出的有效电平*/
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 			/*输出使能*/
    TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;			/*互补输出使能*/
    TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;			/*输出通道空闲电平极性配置（刹车后为空闲状态）*/
    TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Set;  			/*互补输出通道空闲电平极性配置*/
	
    TIM_OC1Init(TIM1, &TIM_OCInitStructure);								/*根据TIM指定的参数初始化外设TIM1 OC1*/
	TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);						/*使能TIM1在CCR1上的预装载寄存器*/
		
    /*刹车和死区设置*/
    TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable; 			/*OSSR:运行模式下“关闭状态”选择*/
    TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable; 			/*OSSI:空闲模式下“关闭状态”选择*/
    TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1; 					/*锁定设置，级别为1*/
    TIM_BDTRInitStructure.TIM_DeadTime = deadtime;							/*死区延时时间*/
    TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;					/*禁止刹车输入*/
    TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low; 		/*刹车输入极性*/
    TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable; /*自动输出使能*/
    TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
	
	TIM_ARRPreloadConfig(TIM1,ENABLE);										/*设置ARR值（周期值)在当前周期即改变*/
	
	TIM_Cmd(TIM1, ENABLE);
    TIM_CtrlPWMOutputs(TIM1, ENABLE);										/*主输出使能，高级定时器专用*/							

	TIM_DMACmd(TIM1, TIM_DMA_Update, ENABLE); 								/*TIM1 DMA请求使能,注：TIM1_Update请求对应DMA通道为DMA1_chanel5*/
}