STM32F1 定时器1通道1,2互补PWM软件仿真波形存在问题

h101611123 · 发表于 2017-11-21 15:18:16

论坛里的大大们，请教个关于PWM的问题。
小弟使用STM32F103CBT6自己制作的板子，使用定时器1的通道1,2输出pwm波形，这两个通道的互补波形软件仿真为什么都存在如上图的怪异现象呢？代码如下所示：
void Timer1_ch1_ch2_PWM_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
TIM_OCInitTypeDef    TIM_OCInitStruct;
GPIO_InitTypeDef GPIO_InitStruct;
TIM_BDTRInitTypeDef    TIM_BDTRInitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);

//2¿·ÖÖØó3éä
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM1, ENABLE);

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_7 | GPIO_Pin_8;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStruct);

TIM_TimeBaseInitStruct.TIM_Period = 288 - 1; /*125KHz */
TIM_TimeBaseInitStruct.TIM_Prescaler = 1;
TIM_TimeBaseInitStruct.TIM_ClockDivision = 0;
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStruct);

TIM_OCStructInit(&TIM_OCInitStruct);/*Õaò»2½×îoÃ¼óéÏ*/

TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStruct.TIM_Pulse = 100;
TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStruct.TIM_OCNPolarity = TIM_OCPolarity_High;
TIM_OCInitStruct.TIM_OutputState=TIM_OutputState_Enable;
TIM_OCInitStruct.TIM_OutputNState=TIM_OutputNState_Enable;
TIM_OCInitStruct.TIM_OCIdleState = TIM_OCIdleState_Set; //êä3ö¿ÕÏD×′ì¬Îa1
TIM_OCInitStruct.TIM_OCNIdleState = TIM_OCIdleState_Reset;//Ñ¡Ôñ¿ÕÏD×′ì¬ÏÂμÄ·Ç1¤×÷×′ì¬
TIM_OC1Init(TIM1, &TIM_OCInitStruct);

TIM_OCInitStruct.TIM_OutputState=TIM_OutputState_Enable;
TIM_OCInitStruct.TIM_OutputNState=TIM_OutputNState_Enable;
TIM_OCInitStruct.TIM_Pulse = 50;
TIM_OC2Init(TIM1, &TIM_OCInitStruct);

TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);

#if 0
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
TIM_BDTRInitStructure.TIM_DeadTime = 0x10;
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
#endif
TIM_ARRPreloadConfig(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM1, ENABLE);/*¸ÃoˉêyÖ»Õë¶Ôtimer1oítimer8*/
TIM_Cmd(TIM1, ENABLE);

wxjhby · 发表于 2017-11-21 15:18:17

不能同时导通那两个就是互补的

h101611123 · 发表于 2017-11-21 15:19:06

请论坛的大大们，帮忙看看！！！小弟先谢谢各位了。

h101611123 · 发表于 2017-11-21 18:36:28

就这么沉了么

正点原子 · 发表于 2017-11-22 00:48:46

帮顶

h101611123 · 发表于 2017-11-22 09:03:27

正点原子发表于 2017-11-22 00:48
帮顶

原子哥，帮忙看下是什么原因a

wxjhby · 发表于 2017-11-22 09:50:57

h101611123 发表于 2017-11-22 09:03
原子哥，帮忙看下是什么原因a

软件仿真有问题，但是实际用硬件测试用示波器看效果可能不一样，你看看硬件测试示波器是不是也是这样的波形，你这个尖峰的宽度应该就是死区时间的宽度，黑色和蓝色的是互补输出么，看起来电平不太对

h101611123 · 发表于 2017-11-22 10:09:44

wxjhby 发表于 2017-11-22 09:50
软件仿真有问题，但是实际用硬件测试用示波器看效果可能不一样，你看看硬件测试示波器是不是也是这样的波 ...

如图1所示，四组波形，软件仿真。下面两组是占空比50%的互补pwm输出。上面两组也是占空比50%的互补pwm输出。只是互补的波形软件仿真没显示出来。硬件示波器测量是有输出的。
如图2所示。加上死区这部分代码：
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
TIM_BDTRInitStructure.TIM_DeadTime = 0x7F;
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);

我就是不明白这个死区时间是怎么确定的？还有加上死区时间后，这个pwm波形的变化是正确的么？我的目标是用两路互补的四路pwm波形控制H桥驱动一个低频的天线，但是目标的pwm波形不知道是啥样子，这个该怎么调？