【雙極性SPWM調(diào)制講解以及基于stm32的代碼生成-嗶哩嗶哩】 https://b23.tv/ytFxdkL

雙極性spwm調(diào)制雖然沒(méi)有單極性好用，但比單極性要簡(jiǎn)單易懂一些，以下教程是如何利用stm32實(shí)現(xiàn)雙極性spwm調(diào)制.

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?怎么根據(jù)不同開(kāi)關(guān)模式下的Uab值來(lái)輸出連續(xù)的正弦波呢，我們先取幾個(gè)特殊點(diǎn)分析。

??在正弦波峰值處，+VD寬度最大，因此T1，T4管此時(shí)的占空比達(dá)到最大，-VD寬度最小，因此T2,T3的最小，此時(shí)Uab為兩者相減（因?yàn)?,3導(dǎo)通時(shí)為-VD），正好也是最大值。

在正弦波過(guò)0處， +VD寬度接近一半周期，因此T1，T4管此時(shí)的占空比約為一半， -VD也是，因此T2,T3的也是，此時(shí)Uab為兩者相減（因?yàn)?,3導(dǎo)通時(shí)為-VD），正好也是過(guò)0。

?在正弦波谷值處， +VD寬度最小，因此T1，T4管此時(shí)的占空比達(dá)到最小， -VD寬度最大，因此T2,T3的最大，此時(shí)Uab為兩者相減（因?yàn)?,3導(dǎo)通時(shí)為-VD），正好也是最小值。

這三種特殊點(diǎn)之間的變化過(guò)程，如果占空比是按正弦規(guī)律變化的，那么，不難理解，最終輸出波形會(huì)是連續(xù)的正弦波形。

以上就是大致的原理。接下來(lái)就是代碼的生成。

打開(kāi)cubemx，選擇芯片型號(hào)新建工程。

?選擇外部時(shí)鐘并配置時(shí)鐘樹(shù)

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接下來(lái)配置定時(shí)器1（也可以定時(shí)器8）pwm互補(bǔ)輸出，這里選擇通道一

?頻率為168M/(0+1)/(8399+1)=20KHZ；向上計(jì)數(shù)模式

配置死區(qū)和占空比；我這死區(qū)配的100多ns，大家根據(jù)實(shí)際需要配置

?因?yàn)橐哉乙?guī)律改占空比，配置一個(gè)20khz的定時(shí)器中斷

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?接下來(lái)就是工程命名，大家用英文路徑。

?生成工程轉(zhuǎn)到keil。

?文章來(lái)源地址http://www.zghlxwxcb.cn/news/detail-611111.html

?在合適位置加入下列代碼

HAL_TIM_Base_Start_IT(&htim2);//開(kāi)啟定時(shí)器2中斷
HAL_TIM_PWM_Start (&htim1,TIM_CHANNEL_1);//開(kāi)啟四路pwm波
HAL_TIMEx_PWMN_Start (&htim1,TIM_CHANNEL_1);

?在合適位置復(fù)制以下代碼，

uint16_t spwmcnt=0;//數(shù)組計(jì)數(shù)值：0~399；
float M=0.8;//調(diào)制比M：0~1
int spwm_group[400]={
	33,99,165,231,297,362,428,494,559,624,690,755,819,884,948,1013,1076,
1140,1203,1266,1329,1392,1454,1515,1577,1638,1698,1758,1818,1877,1936,1994,2052,
2110,2166,2223,2278,2333,2388,2442,2495,2548,2600,2652,2703,2753,2802,2851,2899,
2946,2993,3039,3084,3129,3172,3215,3257,3298,3339,3378,3417,3455,3492,3528,3564,
3598,3632,3664,3696,3727,3757,3786,3814,3841,3868,3893,3917,3940,3963,3984,4005,
4024,4042,4060,4076,4092,4106,4119,4132,4143,4153,4163,4171,4178,4184,4190,4194,
4197,4199,4200,4200,4199,4197,4194,4190,4184,4178,4171,4163,4153,4143,4132,4119,
4106,4092,4076,4060,4042,4024,4005,3984,3963,3940,3917,3893,3868,3841,3814,3786,
3757,3727,3696,3664,3632,3598,3564,3528,3492,3455,3417,3378,3339,3298,3257,3215,
3172,3129,3084,3039,2993,2946,2899,2851,2802,2753,2703,2652,2600,2548,2495,2442,
2388,2333,2278,2223,2166,2110,2052,1994,1936,1877,1818,1758,1698,1638,1577,1515,
1454,1392,1329,1266,1203,1140,1076,1013,948,884,819,755,690,624,559,494,
428,362,297,231,165,99,33,-33,-99,-165,-231,-297,-362,-428,-494,-559,
-624,-690,-755,-819,-884,-948,-1013,-1076,-1140,-1203,-1266,-1329,-1392,-1454,-1515,-1577,
-1638,-1698,-1758,-1818,-1877,-1936,-1994,-2052,-2110,-2166,-2223,-2278,-2333,-2388,-2442,-2495,
-2548,-2600,-2652,-2703,-2753,-2802,-2851,-2899,-2946,-2993,-3039,-3084,-3129,-3172,-3215,-3257,
-3298,-3339,-3378,-3417,-3455,-3492,-3528,-3564,-3598,-3632,-3664,-3696,-3727,-3757,-3786,-3814,
-3841,-3868,-3893,-3917,-3940,-3963,-3984,-4005,-4024,-4042,-4060,-4076,-4092,-4106,-4119,-4132,
-4143,-4153,-4163,-4171,-4178,-4184,-4190,-4194,-4197,-4199,-4200,-4200,-4199,-4197,-4194,-4190,
-4184,-4178,-4171,-4163,-4153,-4143,-4132,-4119,-4106,-4092,-4076,-4060,-4042,-4024,-4005,-3984,
-3963,-3940,-3917,-3893,-3868,-3841,-3814,-3786,-3757,-3727,-3696,-3664,-3632,-3598,-3564,-3528,
-3492,-3455,-3417,-3378,-3339,-3298,-3257,-3215,-3172,-3129,-3084,-3039,-2993,-2946,-2899,-2851,
-2802,-2753,-2703,-2652,-2600,-2548,-2495,-2442,-2388,-2333,-2278,-2223,-2166,-2110,-2052,-1994,
-1936,-1877,-1818,-1758,-1698,-1638,-1577,-1515,-1454,-1392,-1329,-1266,-1203,-1140,-1076,-1013,
-948,-884,-819,-755,-690,-624,-559,-494,-428,-362,-297,-231,-165,-99,-33,
};
 void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)  //中斷回調(diào)函數(shù) 20k
{
	if(htim==&htim2)
	{
	TIM1->CCR1 = 4200.f + M*spwm_group[spwmcnt] ;//20khz的頻率改變400次，20000/400=50hz的正弦波；
	spwmcnt++;
  if(spwmcnt==400)spwmcnt=0;	
  }
}

?編譯，沒(méi)有報(bào)錯(cuò)，可以正常使用。

??? ?其中T1，T4管由TIM1-CH1(PE9)驅(qū)動(dòng)；
?? ?T2，T3管由TIM1-CH1N(PA7)驅(qū)動(dòng)；

如何在上電路前檢查自己的spwm對(duì)不對(duì)呢，首先可以把中斷關(guān)了，固定占空比輸出，用示波器看pwm波的頻率對(duì)不對(duì)，互補(bǔ)兩路間有沒(méi)有合適的死區(qū)時(shí)間；無(wú)誤后正常開(kāi)啟中斷，準(zhǔn)備兩個(gè)合適且參數(shù)一樣的RC濾波器，選擇兩路通道接上，并用示波器的兩個(gè)通道同時(shí)看兩個(gè)濾波器中電容兩端波形，理論上CH1和CH1N為反相的50HZ正弦波。

如果有問(wèn)題，歡迎留言交流，順便把工程上傳了，供大家下載（沒(méi)有會(huì)員的就沒(méi)必要特意開(kāi)了哈）。

https://download.csdn.net/download/m0_65265936/86394301

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