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\/>\u4ece\u8fd9\u4e2a\u56fe\u53ef\u4ee5\u770b\u5230\uff0cREF\u8f93\u51fa\u4e4b\u540e\u8fd8\u6709\u4e00\u4e2a\u6781\u6027\u914d\u7f6e\uff0c\u6240\u4ee5\u4f7f\u7528PWM\u6a21\u5f0f1\u7684\u6b63\u6781\u6027\u548cPWM\u6a21\u5f0f2\u7684\u53cd\u6781\u6027\u6700\u7ec8\u7684\u6700\u7ec8\u7684\u8f93\u51fa\u662f\u4e00\u6837\u7684\u3002\u8fd9\u91cc\u8bbe\u8ba1\u7684\u6bd4\u8f83\u7075\u6d3b\uff0c\u8f93\u51fa\u6a21\u5f0f\u91cc\u53ef\u4ee5\u8bbe\u7f6e\u6781\u6027\uff0c\u6700\u7ec8\u8f93\u51fa\u4e4b\u524d\u4e5f\u53ef\u4ee5\u8bbe\u7f6e\u6781\u6027\uff0c\u90a3\u8fd9\u5c31\u662f\u4e24\u4e2a\u6a21\u5f0f\u7684\u533a\u522b\uff0c\u6240\u4ee5\u4f7f\u7528\u7684\u8bdd\uff0c\u6211\u4eec\u53ef\u4ee5\u53ea\u4f7f\u7528PWM\u6a21\u5f0f1\uff0c\u5e76\u4e14\u662f\u5411\u4e0a\u8ba1\u6570\uff0c\u8fd9\u4e00\u79cd\u6a21\u5f0f\u5c31\u884c\u4e86\u3002\u90a3\u8fd9\u79cd\u6a21\u5f0f\u662f\u600e\u4e48\u8f93\u51fa\u9891\u7387\u548c\u5360\u7a7a\u6bd4\u90fd\u53ef\u8c03\u7684PWM\u6ce2\u5f62\u5462\uff1f<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-561\" src=\"https:\/\/aoofoo.com\/wp-content\/uploads\/2024\/07\/1-80.png\" alt=\"\" width=\"1082\" height=\"598\" \/><\/p>\n<p>\u5728\u8fd9\u91cc\uff0c\u6211\u7ed9\u51fa\u4e86\u8f93\u51faPWM\u7684\u57fa\u672c\u7ed3\u6784\uff0c\u8fd9\u4e5f\u662f\u6211\u4eec\u672c\u8282\u8bfe\u7684\u91cd\u70b9\u5185\u5bb9\u3002\u9996\u5148\u5de6\u4e0a\u89d2\u662f\u65f6\u57fa\u5355\u5143\u548c\u8fd0\u884c\u63a7\u5236\u90e8\u5206\uff0c\u8f93\u51faPWM\u6682\u65f6\u8fd8\u4e0d\u9700\u8981\u4e2d\u65ad\uff0c\u914d\u7f6e\u597d\u65f6\u57fa\u5355\u5143\uff0c\u8fd9\u91cc\u7684CNT\u5c31\u53ef\u4ee5\u5f00\u59cb\u4e0d\u65ad\u5730\u81ea\u589e\u8fd0\u884c\u4e86\uff0c\u7136\u540e\uff0c\u4e0b\u9762\u8fd9\u91cc\uff0c\u5c31\u662f\u8f93\u51fa\u6bd4\u8f83\u5355\u5143\u4e86\uff0c\u603b\u5171\u67094\u8def\uff0c\u8f93\u51fa\u6bd4\u8f83\u5355\u5143\u7684\u6700\u5f00\u59cb\uff0c\u662fCCR\u6355\u83b7\u6bd4\u8f83\u5bc4\u5b58\u5668\uff0cCCR\u662f\u6211\u4eec\u81ea\u5df1\u8bbe\u5b9a\u7684\uff0cCNT\u4e0d\u65ad\u81ea\u589e\u8fd0\u884c\uff0c\u540c\u65f6\u4ed6\u4fe9\u8fd8\u5728\u4e0d\u65ad\u8fdb\u884c\u6bd4\u8f83\uff0cCCR\u540e\u9762\u5c31\u662f\u8f93\u51fa\u6a21\u5f0f\u63a7\u5236\u5668\uff0c\u56fe\u4f8b\u662f\u4ee5PWM\u6a21\u5f0f1\u4e3a\u4f8b\u5b50\u6765\u8bb2\u89e3\u7684\uff0c\u8fd9\u91cc\u9762\u662fPWM\u6a21\u5f0f1\u7684\u6267\u884c\u903b\u8f91\uff0c\u90a3\u4ed6\u662f\u600e\u4e48\u8f93\u51faPWM\u6ce2\u5f62\u7684\u5462\uff1f<\/p>\n<p>\u6211\u4eec\u770b\u4e00\u4e0b\u53f3\u4e0a\u89d2\u7684\u8fd9\u4e2a\u56fe\uff0c\u8fd9\u91cc\u84dd\u8272\u7ebf\u662fCNT\u7684\u503c\uff0c\u9ec4\u8272\u7ebf\u662fARR\u7684\u503c\uff0c\u84dd\u8272\u5148\u4ece0\u5f00\u59cb\u81ea\u589e\uff0c\u4e00\u76f4\u589e\u5230ARR\uff0c\u4e5f\u5c31\u662f99\uff0c\u4e4b\u540e\u6e050\u7ee7\u7eed\u81ea\u589e\u3002\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u518d\u8bbe\u7f6e\u4e00\u6761\u7ea2\u8272\u7ebf\uff0c\u8fd9\u6761\u7ea2\u8272\u7ebf\u5c31\u662fCCR\uff0c\u6bd4\u5982\u6211\u4eec\u8bbe\u7f6eCCR\u662f30\uff0c\u4e4b\u540e\u518d\u6267\u884cPWM\u6a21\u5f0f1\u7684\u903b\u8f91\uff0c\u4e0b\u9762\u7684\u7eff\u8272\u7ebf\u5c31\u662f\u8f93\u51fa\u3002\u8fd9\u6837\u4e00\u76f4\u6301\u7eed\u4e0b\u53bb\uff0cREF\u7684\u7535\u5e73\u5c31\u4f1a\u4e0d\u65ad\u7684\u53d8\u5316\uff0c\u5e76\u4e14\u5b83\u7684\u5360\u7a7a\u6bd4\u662f\u53d7CCR\u503c\u7684\u8c03\u63a7\u7684\uff0c\u5982\u679cCCR\u8bbe\u7f6e\u7684\u9ad8\u4e00\u4e9b\uff0c\u8f93\u51fa\u7684\u5360\u7a7a\u6bd4\u5c31\u53d8\u5927\uff0cCCR\u8bbe\u7f6e\u7684\u4f4e\u4e00\u4e9b\uff0c\u8f93\u51fa\u7684\u5360\u7a7a\u6bd4\u5c31\u4f1a\u53d8\u5c0f\uff0c\u8fd9\u5c31\u662fPWM\u6a21\u5f0f\u7684\u5de5\u4f5c\u6d41\u7a0b\uff0c\u8fd9\u91ccREF\uff0c\u5c31\u662f\u9891\u7387\u53ef\u8c03\uff0c\u5360\u7a7a\u6bd4\u4e5f\u53ef\u8c03\u7684PWM\u6ce2\u5f62\u3002\u6700\u7ec8\u518d\u7ecf\u8fc7\u6781\u6027\u9009\u62e9\uff0c\u8f93\u51fa\u4f7f\u80fd\uff0c\u6700\u7ec8\u901a\u5411GPIO\u53e3\u3002\u8fd9\u6837\u5c31\u80fd\u5b8c\u6210PWM\u6ce2\u5f62\u7684\u8f93\u51fa\u4e86\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u5c31\u6765\u518d\u770b\u4e00\u4e0bPWM\u6ce2\u5f62\u7684\u53c2\u6570\u662f\u5982\u4f55\u8ba1\u7b97\u7684\u5427\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-562\" src=\"https:\/\/aoofoo.com\/wp-content\/uploads\/2024\/07\/1-81.png\" alt=\"\" width=\"473\" height=\"280\" \/><\/p>\n<p><span style=\"color: #ff6600;\">PWM\u9891\u7387<\/span>\uff1a\u901a\u8fc7\u56fe\u53ef\u4ee5\u770b\u51fa\uff0cPWM\u6ce2\u5f62\u7684\u5468\u671f\u59cb\u7ec8\u548c\u8ba1\u6570\u5668\u7684\u6ea2\u51fa\u66f4\u65b0\u5468\u671f\u76f8\u540c\uff0c\u6240\u4ee5PWM\u7684\u9891\u7387\u7b49\u4e8e\u8ba1\u6570\u5668\u7684\u66f4\u65b0\u9891\u7387\u3002<\/p>\n<p>\u5373 Freq = CK_PSC\/(PSC+1)\/(ARR+1) \u3002<\/p>\n<p><span style=\"color: #ff6600;\">\u5360\u7a7a\u6bd4\u53c2\u6570<\/span>\uff1a\u770b\u56fe\u53ef\u4ee5\u77e5\u9053\uff0cCNT\u662f\u4ece0\u4e00\u76f4\u52a0\u5230ARR\uff0c\u8fd9\u91ccARR\u662f99\uff0c\u6240\u4ee5CNT\u4e00\u5171\u662f\u4ece0\u8ba1\u523099\u5171100\u4e2a\u6570\u3002CNT\u4ece0\u8ba1\u5230CCR\uff0c\u6bd4\u5982CCR\u662f30\uff0c\u6ce8\u610f\u8fd9\u91cc\u5728\u7b49\u4e8e30\u7684\u77ac\u95f4\uff0c\u5c31\u5df2\u7ecf\u8df3\u53d8\u4e3a\u4f4e\u7535\u5e73\u4e86\uff0c\u6240\u4ee5CNT\u4ece0\u523029\u662f\u9ad8\u7535\u5e73\uff0c\u603b\u5171\u662f30\u4e2a\u6570\u7684\u65f6\u95f4\u3002<\/p>\n<p>\u5373 Duty = CCR\/(ARR+1)\u3002<\/p>\n<div class=\"sc-star-plane sc-star-plane--1\"><div class=\"sc-star-plane__content\"><\/p>\n<p>\u7531\u4e8e\u8ba1\u6570\u5668\u4ece0\u5f00\u59cb\u8ba1\u6570\uff0c\u5230\u8fbeARR\u65f6\u4f1a\u56de\u52300\uff0c\u56e0\u6b64\u8ba1\u6570\u5468\u671f\u5b9e\u9645\u4e0a\u662fARR + 1\u4e2a\u8ba1\u6570\u5355\u5143\uff1a<\/p>\n<p>\u5982\u679cARR = 999\uff0c\u8ba1\u6570\u5668\u4ece0\u8ba1\u6570\u5230999\uff0c\u603b\u5171\u67091000\u4e2a\u8ba1\u6570\u5355\u5143\u3002<\/p>\n<p><\/div><\/div>\n<p><span style=\"color: #ff6600;\">\u5206\u8fa8\u7387<\/span>\uff1a\u5206\u8fa8\u7387\u5c31\u662f\u5360\u7a7a\u6bd4\u53d8\u5316\u7684\u6b65\u8ddd\uff0c\u4ece\u4e0a\u9762\u8fd9\u4e2a\u56fe\u53ef\u4ee5\u770b\u51fa\uff0cCCR\u7684\u503c\u5e94\u8be5\u662f\u57280\u5230ARR+1\u8fd9\u4e2a\u8303\u56f4\u5185\u3002CCR=ARR+1\u65f6\uff0c\u5360\u7a7a\u6bd4\u521a\u597d\u662f100%\uff0c\u5982\u679cCCR\u518d\u5927\u4e00\u4e9b\uff0c\u90a3\u5360\u7a7a\u6bd4\u59cb\u7ec8\u5c31\u662f100%\uff0c\u6ca1\u6709\u610f\u4e49\u4e86\u3002\u6240\u4ee5CCR\u7684\u53d8\u5316\u8303\u56f4\u53d6\u51b3\u4e8eARR\u7684\u503c\uff0cARR\u8d8a\u5927\uff0cCCR\u7684\u8303\u56f4\u5c31\u8d8a\u5927\uff0c\u5bf9\u5e94\u7684\u5206\u8fa8\u7387\u5c31\u8d8a\u5927\u3002\u6240\u4ee5\u603b\u7ed3\u4e00\u4e0b\u516c\u5f0f\u5c31\u662f \u5206\u8fa8\u7387 = 1\/\uff08ARR+1\uff09\u3002\u6ce8\u610f\u8fd9\u91cc\u5b9a\u4e49\u7684\u5206\u8fa8\u7387\u662f\u5360\u7a7a\u6bd4\u6700\u5c0f\u7684\u53d8\u5316\u6b65\u8ddd\u3002\u6240\u4ee5\u8fd9\u4e2a\u503c\u662f\u8d8a\u5c0f\u8d8a\u597d\u3002\u4f60\u4e5f\u53ef\u4ee5\u628aCCR\u7684\u8303\u56f4\u5b9a\u4e49\u6210\u5206\u8fa8\u7387\uff0c\u90a3\u5c31\u662f\u503c\u8d8a\u5927\u8d8a\u597d\u3002\u603b\u4e4b\u5c31\u662f\u5360\u7a7a\u6bd4\u53d8\u5316\u7684\u8d8a\u7ec6\u817b\uff0c\u8d8a\u597d\u3002<\/p>\n<div class=\"sc-star-plane sc-star-plane--1\"><div class=\"sc-star-plane__content\"><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-564\" src=\"https:\/\/aoofoo.com\/wp-content\/uploads\/2024\/07\/1-82.png\" alt=\"\" width=\"528\" height=\"369\" \/><\/p>\n<p><\/div><\/div>\n<p>\u5982\u679c\u8981\u6c42\u4f60\u8f93\u51fa\u4e00\u4e2a\u9891\u7387\u4e3a1KHz\uff0c\u5360\u7a7a\u6bd4\u53ef\u4efb\u610f\u8c03\u8282\uff0c\u4e14\u5206\u8fa8\u7387\u4e3a1&amp;\u7684PWM\u6ce2\u5f62\uff0c\u90a3\u4f60\u4f1a\u4e0d\u4f1a\u7528\u8fd9\u91cc\u7684\u516c\u5f0f\uff0c\u6765\u627e\u5230\u5408\u9002\u7684\u53c2\u6570\u5462\uff1f<\/p>\n<p>\u5927\u5bb6\u5148\u60f3\u4e00\u60f3\uff0c\u6211\u4eec\u4e0b\u4e00\u5c0f\u8282\u6765\u8fdb\u884c\u64cd\u4f5c\u3002\u90a3\u5230\u8fd9\u91cc\u6709\u5173PWM\u8f93\u51fa\u7684\u5185\u5bb9\u5c31\u8bb2\u5b8c\u4e86\u3002<\/p>\n<h2>\u8235\u673a\u7b80\u4ecb<\/h2>\n<p>\u8235\u673a\u53ef\u4ee5\u7528PWM\u4fe1\u53f7\u6765\u63a7\u5236\u8235\u673a\u8f93\u51fa\u8f74\u7684\u89d2\u5ea6\u3002<\/p>\n<p>\u8235\u673a\u662f\u4e00\u79cd\u6839\u636e\u8f93\u5165PWM\u4fe1\u53f7\u5360\u7a7a\u6bd4\u6765\u63a7\u5236\u8f93\u51fa\u89d2\u5ea6\u7684\u88c5\u7f6e\u3002<\/p>\n<p>\u6211\u4eec\u770b\u4e00\u4e0b\u8235\u673a\u7684\u5185\u90e8\u56fe\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-568\" src=\"https:\/\/aoofoo.com\/wp-content\/uploads\/2024\/07\/1-84.png\" alt=\"\" width=\"449\" height=\"528\" \/><\/p>\n<p>\u5728\u8fd9\u91cc\u53ef\u4ee5\u770b\u5230\u91cc\u9762\u7684\u7ed3\u6784\u6709\u8235\u673a\u4e0a\u76d6\u3001\u8f93\u51fa\u8f74\u3001\u51cf\u901f\u9f7f\u8f6e\u7ec4\u3001\u76f4\u6d41\u7535\u673a\u3001\u8235\u673a\u63a7\u5236\u677f\u548c\u7535\u4f4d\u5668\u3002\u53ef\u4ee5\u770b\u51fa\u8235\u673a\u5176\u5b9e\u5e76\u4e0d\u662f\u4e00\u79cd\u5355\u72ec\u7684\u7535\u673a\uff0c\u5b83\u7684\u5185\u90e8\u662f\u7531\u76f4\u6d41\u7535\u673a\u9a71\u52a8\u7684\uff0c\u5b83\u91cc\u9762\u8fd8\u6709\u4e00\u4e2a\u63a7\u5236\u7535\u8def\u677f\uff0c\u662f\u4e00\u4e2a\u7535\u673a\u7684\u63a7\u5236\u7cfb\u7edf\u3002\u5927\u6982\u7684\u6267\u884c\u903b\u8f91\u662f\uff0cPWM\u4fe1\u53f7\u8f93\u5165\u5230\u63a7\u5236\u677f\uff0c\u7ed9\u63a7\u5236\u677f\u4e00\u4e2a\u6307\u5b9a\u7684\u76ee\u6807\u89d2\u5ea6\uff0c\u7136\u540e\u7535\u4f4d\u5668\u4f1a\u68c0\u6d4b\u8f93\u51fa\u8f74\u7684\u5f53\u524d\u89d2\u5ea6\uff0c\u5982\u679c\u5927\u4e8e\u76ee\u6807\u89d2\u5ea6\uff0c\u7535\u673a\u5c31\u4f1a\u53cd\u8f6c\uff0c\u5982\u679c\u5c0f\u4e8e\u76ee\u6807\u89d2\u5ea6\uff0c\u70b9\u51fb\u5c31\u4f1a\u6b63\u8f6c\u3002\u6700\u7ec8\u4f7f\u8f93\u51fa\u8f74\u56fa\u5b9a\u5728\u6307\u5b9a\u89d2\u5ea6\uff0c\u8fd9\u5c31\u662f\u8235\u673a\u7684\u5185\u90e8\u5de5\u4f5c\u6d41\u7a0b\u3002<\/p>\n<p>\u4f46\u4e0d\u7ba1\u600e\u4e48\u6837\uff0c\u6211\u4eec\u53ea\u9700\u8981\u77e5\u9053\uff0c\u8f93\u5165\u4e00\u4e2aPWM\u6ce2\u5f62\uff0c\u8f93\u51fa\u8f74\u56fa\u5b9a\u5728\u4e00\u4e2a\u89d2\u5ea6\u5c31\u884c\u4e86\u3002<\/p>\n<p>\u8f93\u5165PWM\u4fe1\u53f7\u7684\u8981\u6c42\uff1a\u5468\u671f\u4e3a20ms\uff08\u5bf9\u5e94\u7684\u5c31\u662f50Hz\uff09\uff0c\u9ad8\u7535\u5e73\u5bbd\u5ea6\u4e3a0.5ms~2.5ms\uff08\u5c31\u662f\u5360\u7a7a\u6bd4\u662f\u8fd9\u4e2a\u8303\u56f4\uff09\u3002<\/p>\n<p>\u8fd9\u4e2a\u5360\u7a7a\u6bd4\u5bf9\u5e94\u7684\u8f93\u51fa\u89d2\u5ea6\uff0c\u53ef\u4ee5\u770b\u4e0b\u56fe\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-569\" src=\"https:\/\/aoofoo.com\/wp-content\/uploads\/2024\/07\/1-85.png\" alt=\"\" width=\"222\" height=\"227\" 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