{"id":91415,"date":"2026-08-07T22:00:55","date_gmt":"2026-08-07T14:00:55","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/91415.html"},"modified":"2026-08-07T22:00:55","modified_gmt":"2026-08-07T14:00:55","slug":"%e5%bd%93%e6%95%b0%e5%ad%97%e8%8a%af%e7%89%87%e6%83%b3%e9%a9%be%e9%a9%ad%e6%a8%a1%e6%8b%9f%e4%b8%96%e7%95%8c%ef%bc%9apwm-%e8%b0%83%e9%80%9f%e7%9a%84%e8%89%ba%e6%9c%af%e4%b8%8e%e7%83%a7%e6%af%81","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/91415.html","title":{"rendered":"\u5f53\u6570\u5b57\u82af\u7247\u60f3\u9a7e\u9a6d\u6a21\u62df\u4e16\u754c\uff1aPWM \u8c03\u901f\u7684\u827a\u672f\u4e0e\u70e7\u6bc1\u7684\u6559\u8bad"},"content":{"rendered":"<h4>1. \u5148\u5f04\u660e\u767d&#xff1a;\u4e3a\u4ec0\u4e48\u5fc5\u987b\u7528 PWM \u9a71\u52a8\u76f4\u6d41\u7535\u673a&#xff1f;<\/h4>\n<p>\u4f60\u53ef\u80fd\u4f1a\u95ee&#xff0c;\u76f4\u63a5\u63a5\u4e2a\u53ef\u8c03\u7535\u538b\u7684\u7535\u6e90\u4e0d\u5c31\u80fd\u8c03\u901f\u4e86\u5417&#xff1f;\u4e3a\u4ec0\u4e48\u8981\u7528\u8fd9\u79cd\u201c\u65ad\u65ad\u7eed\u7eed\u201d\u7684 PWM&#xff1f;<\/p>\n<p>\u539f\u56e0\u6709\u4e09&#xff0c;\u51b3\u5b9a\u4e86 PWM \u662f\u8fd1\u4e4e\u552f\u4e00\u7684\u6700\u4f18\u89e3&#xff1a;<\/p>\n<li>\n<p>\u6570\u5b57\u7535\u8def\u5929\u751f\u5c31\u4f1a\u5f00\u5173&#xff1a;\u5355\u7247\u673a\u3001\u9f99\u82af\u8fd9\u4e9b\u6570\u5b57\u82af\u7247&#xff0c;\u53ea\u80fd\u8f93\u51fa 0&#xff08;0V&#xff09;\u548c 1&#xff08;3.3V\/5V&#xff09;\u3002\u5b83\u4eec\u662f\u5929\u751f\u7684\u5f00\u5173\u9ad8\u624b&#xff0c;\u800c\u4e0d\u662f\u7ebf\u6027\u8c03\u538b\u5668\u3002PWM \u8ba9\u6570\u5b57\u82af\u7247\u80fd\u5e72\u6a21\u62df\u7684\u6d3b\u3002<\/p>\n<\/li>\n<li>\n<p>\u6548\u7387\u6781\u9ad8&#xff0c;\u51e0\u4e4e\u4e0d\u53d1\u70ed&#xff1a;\u5f00\u5173\u7ba1&#xff08;\u6bd4\u5982 MOSFET&#xff09;\u5728 PWM \u9a71\u52a8\u4e0b&#xff0c;\u8981\u4e48\u662f\u5b8c\u5168\u5bfc\u901a&#xff08;\u7535\u963b\u6781\u5c0f&#xff0c;\u53d1\u70ed\u6781\u4f4e&#xff09;&#xff0c;\u8981\u4e48\u662f\u5b8c\u5168\u5173\u65ad&#xff08;\u7535\u6d41\u4e3a\u96f6&#xff0c;\u4e0d\u53d1\u70ed&#xff09;\u3002\u80fd\u91cf\u51e0\u4e4e\u90fd\u9001\u5230\u4e86\u7535\u673a&#xff0c;\u800c\u4e0d\u662f\u50cf\u7ebf\u6027\u7a33\u538b\u90a3\u6837&#xff0c;\u628a\u591a\u4f59\u7684\u80fd\u91cf\u53d8\u6210\u70ed\u91cf\u767d\u767d\u8017\u6563\u3002\u8fd9\u5c31\u597d\u6bd4&#xff0c;\u4f60\u8ba9\u4e00\u4e2a\u4eba\u7528\u6700\u5feb\u901f\u5ea6\u65ad\u7eed\u5730\u63a8\u4e00\u4e2a\u91cd\u7269&#xff0c;\u6bd4\u4ed6\u6301\u7eed\u7528\u6162\u901f\u63a8\u8981\u7701\u529b\u5f97\u591a\u3002<\/p>\n<\/li>\n<li>\n<p>\u4f4e\u901f\u626d\u77e9\u5927&#xff1a;PWM \u7ed9\u7535\u673a\u7684\u662f\u6ee1\u7535\u538b\u8109\u51b2&#xff0c;\u80fd\u4ea7\u751f\u5f88\u5f3a\u7684\u542f\u52a8\u529b\u77e9\u3002\u8fd9\u4e00\u70b9&#xff0c;\u6bd4\u5355\u7eaf\u964d\u4f4e\u7535\u538b\u5bfc\u81f4\u7684\u7535\u673a\u201c\u8f6f\u7ef5\u7ef5\u201d\u8981\u597d\u5f97\u591a\u3002<\/p>\n<\/li>\n<p>\u4e00\u53e5\u8bdd\u603b\u7ed3&#xff1a;PWM \u662f\u6570\u5b57\u5927\u8111\u63a7\u5236\u6a21\u62df\u808c\u8089\u7684\u6700\u4f18\u96c5\u65b9\u5f0f\u3002<\/p>\n<hr \/>\n<h4>2. \u6838\u5fc3\u539f\u7406&#xff1a;\u4e00\u6839\u7ed5\u5f00\u7684\u201c\u80fd\u91cf\u6c34\u7ba1\u201d<\/h4>\n<p>PWM \u662f\u600e\u4e48\u5b9e\u73b0\u8c03\u901f\u7684&#xff1f;\u60f3\u8c61\u4f60\u8981\u7ed9\u690d\u7269\u6d47\u6c34&#xff0c;\u4f46\u6c34\u9f99\u5934\u574f\u4e86&#xff0c;\u53ea\u80fd\u8981\u4e48\u5168\u5f00&#xff0c;\u8981\u4e48\u5168\u5173\u3002<\/p>\n<ul>\n<li>\n<p>\u9891\u7387 (Frequency)&#xff1a;\u4f60\u5f00\u5173\u9f99\u5934\u7684\u5feb\u6162&#xff0c;\u6bd4\u5982\u6bcf\u79d2\u5f00\u5173 1000 \u6b21&#xff08;\u5373 1kHz&#xff09;\u3002\u8fd9\u4e2a\u503c\u901a\u5e38\u5728\u51e0\u5343\u5230\u51e0\u4e07\u8d6b\u5179\u3002<\/p>\n<\/li>\n<li>\n<p>\u5360\u7a7a\u6bd4 (Duty Cycle)&#xff1a;\u5728\u4e00\u4e2a\u5f00\u5173\u5468\u671f\u5185&#xff0c;\u9f99\u5934\u6253\u5f00\u7684\u65f6\u95f4\u5360\u603b\u65f6\u95f4\u7684\u767e\u5206\u6bd4\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u6548\u679c\u51fa\u6765\u4e86&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u5360\u7a7a\u6bd4 100%&#xff1a;\u9f99\u5934\u4e00\u76f4\u5168\u5f00&#xff0c;\u6c34\u91cf\u6700\u5927&#xff0c;\u7535\u673a\u5168\u901f\u8f6c\u3002<\/p>\n<\/li>\n<li>\n<p>\u5360\u7a7a\u6bd4 50%&#xff1a;\u4e00\u534a\u65f6\u95f4\u5168\u5f00&#xff0c;\u4e00\u534a\u65f6\u95f4\u5168\u5173\u3002\u76f8\u5f53\u4e8e\u5e73\u5747\u6c34\u91cf\u53ea\u6709\u4e00\u534a&#xff0c;\u7535\u673a\u4e2d\u901f\u8f6c\u3002<\/p>\n<\/li>\n<li>\n<p>\u5360\u7a7a\u6bd4 10%&#xff1a;\u53ea\u6709\u5341\u5206\u4e4b\u4e00\u7684\u65f6\u95f4\u6709\u6c34\u3002\u5e73\u5747\u6c34\u91cf\u6781\u5c0f&#xff0c;\u7535\u673a\u4f4e\u901f\u8f6c\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u7535\u673a\u672c\u8eab\u662f\u4e2a\u5927\u7535\u611f&#xff0c;\u6709\u60ef\u6027\u548c\u6ee4\u6ce2\u4f5c\u7528&#xff0c;\u5b83\u5206\u4e0d\u6e05\u201c\u8109\u52a8\u7684\u7535\u538b\u201d&#xff0c;\u53ea\u4f1a\u5fe0\u5b9e\u5730\u54cd\u5e94\u8fd9\u4e2a\u5e73\u5747\u7535\u538b\u3002\u6539\u53d8\u5360\u7a7a\u6bd4&#xff0c;\u5c31\u7b49\u4e8e\u6539\u53d8\u4e86\u52a0\u5728\u7535\u673a\u4e24\u7aef\u7684\u7b49\u6548\u7535\u538b&#xff0c;\u901f\u5ea6\u4e5f\u5c31\u88ab\u5e73\u6ed1\u5730\u63a7\u5236\u4f4f\u4e86\u3002<\/p>\n<p>\u516c\u5f0f&#xff1a;\u7b49\u6548\u7535\u538b V_avg &#061; \u7535\u6e90\u7535\u538b V_cc \u00d7 \u5360\u7a7a\u6bd4 D<\/p>\n<hr \/>\n<h4>3. \u4ece\u82af\u7247\u5230\u7535\u673a&#xff1a;\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u76f4\u63a5\u8fde&#xff1f;<\/h4>\n<p>\u8fd9\u662f\u4e00\u4e2a\u7edd\u5bf9\u7684\u65b0\u624b\u7981\u533a&#xff0c;\u4e5f\u662f\u9762\u8bd5\u65f6\u8003\u5b98\u91cd\u70b9\u8003\u5bdf\u4f60\u5b9e\u8df5\u80fd\u529b\u7684\u70b9\u3002\u9f99\u82af\u6216\u4efb\u4f55\u5355\u7247\u673a\u7684 GPIO \u5f15\u811a&#xff0c;\u7edd\u5bf9\u4e0d\u5141\u8bb8\u76f4\u63a5\u8fde\u63a5\u7535\u673a&#xff01;<\/p>\n<p>\u539f\u56e0\u6709\u4e24\u4e2a&#xff0c;\u62db\u62db\u81f4\u547d&#xff1a;<\/p>\n<li>\n<p>\u7535\u6d41\u662f\u5929\u5811&#xff1a;\u4e00\u4e2a\u666e\u901a GPIO \u5f15\u811a&#xff0c;\u6700\u5927\u8f93\u51fa\u7535\u6d41\u5728 10-20mA \u5de6\u53f3\u3002\u800c\u4e00\u4e2a\u6700\u5c0f\u7684\u76f4\u6d41\u7535\u673a&#xff0c;\u542f\u52a8\u77ac\u95f4\u7684\u7535\u6d41\u4e5f\u8f7b\u677e\u8fbe\u5230 200-500mA&#xff0c;\u6b63\u5e38\u5de5\u4f5c\u65f6\u4e5f\u8fdc\u5927\u4e8e 20mA\u3002\u76f4\u63a5\u9a71\u52a8&#xff0c;\u4f1a\u5728\u5fae\u79d2\u7ea7\u5185\u70e7\u6bc1\u82af\u7247\u5185\u90e8\u7684\u5f15\u811a\u9a71\u52a8\u7535\u8def\u3002\u76f8\u5f53\u4e8e\u7528\u4e00\u6839\u7ec6\u94dc\u4e1d\u53bb\u77ed\u8def\u6c7d\u8f66\u7535\u74f6\u3002<\/p>\n<\/li>\n<li>\n<p>\u53cd\u5411\u7535\u52a8\u52bf\u662f\u6bd2\u836f&#xff1a;\u7535\u673a\u5185\u90e8\u6709\u7ebf\u5708&#xff0c;\u662f\u4e2a\u5927\u7535\u611f\u3002\u5f53\u4f60\u5728 PWM \u7684\u5173\u65ad\u77ac\u95f4&#xff0c;\u7ebf\u5708\u91cc\u7684\u7535\u6d41\u4e0d\u80fd\u7a81\u53d8&#xff0c;\u4f1a\u77ac\u95f4\u4ea7\u751f\u4e00\u4e2a\u9ad8\u8fbe\u51e0\u5341\u751a\u81f3\u4e0a\u767e\u4f0f\u7684\u53cd\u5411\u7535\u538b\u5c16\u5cf0&#xff0c;\u8bd5\u56fe\u7ef4\u6301\u7535\u6d41\u3002\u8fd9\u4e2a\u9ad8\u538b\u4f1a\u76f4\u63a5\u704c\u56de GPIO \u5f15\u811a&#xff0c;\u9020\u6210\u6c38\u4e45\u6027\u51fb\u7a7f\u635f\u574f\u3002<\/p>\n<\/li>\n<hr \/>\n<h4>4. \u786c\u4ef6\u8bbe\u8ba1&#xff1a;\u642d\u5efa\u4e00\u4e2a\u5b89\u5168\u7684\u9a71\u52a8\u7535\u8def<\/h4>\n<p>\u8981\u5b89\u5168\u9a71\u52a8&#xff0c;\u5fc5\u987b\u5728\u82af\u7247\u548c\u7535\u673a\u4e4b\u95f4\u52a0\u4e00\u9053\u201c\u9694\u79bb\u5899\u201d\u548c\u201c\u4fdd\u62a4\u7f51\u201d\u3002<\/p>\n<h5>\u6700\u7b80\u65b9\u6848&#xff1a;\u4e00\u4e2a\u529f\u7387\u7ba1\u9a71\u52a8&#xff08;\u53ea\u80fd\u5355\u5411\u8f6c&#xff09;<\/h5>\n<ul>\n<li>\n<p>\u6838\u5fc3\u5143\u4ef6&#xff1a;<\/p>\n<ul>\n<li>\n<p>N\u6c9f\u9053 MOSFET (\u573a\u6548\u5e94\u7ba1)\u00a0\u6216\u00a0NPN \u4e09\u6781\u7ba1<\/p>\n<\/li>\n<li>\n<p>\u7eed\u6d41\u4e8c\u6781\u7ba1\u00a0(\u5982 1N4148, 1N5819)<\/p>\n<\/li>\n<li>\n<p>\u4e0a\u62c9\/\u4e0b\u62c9\u7535\u963b<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u63a5\u7ebf\u903b\u8f91&#xff1a;<\/p>\n<li>\n<p>GPIO \u8f93\u51fa\u00a0-&gt; \u63a5\u4e00\u4e2a 100\u03a9-1k\u03a9 \u7684\u7535\u963b -&gt; \u63a5\u5230 MOSFET \u7684\u00a0\u6805\u6781 (G)\u3002<\/p>\n<\/li>\n<li>\n<p>MOSFET \u7684\u00a0\u6e90\u6781 (S)\u00a0\u76f4\u63a5\u63a5\u5730 (GND)\u3002<\/p>\n<\/li>\n<li>\n<p>\u7535\u673a\u7684\u00a0\u4e00\u7aef\u00a0\u63a5\u4f9b\u7535\u6b63\u6781 (VCC&#xff0c;\u6ce8\u610f\u8981\u80fd\u63d0\u4f9b\u8db3\u591f\u7535\u6d41\u7684\u72ec\u7acb\u7535\u6e90)\u3002<\/p>\n<\/li>\n<li>\n<p>\u7535\u673a\u7684\u00a0\u53e6\u4e00\u7aef\u00a0\u63a5 MOSFET \u7684\u00a0\u6f0f\u6781 (D)\u3002<\/p>\n<\/li>\n<li>\n<p>\u5173\u952e\u4fdd\u62a4&#xff1a;\u5728\u7535\u673a\u7684\u4e24\u6839\u63a5\u7ebf\u67f1\u4e4b\u95f4&#xff0c;\u53cd\u5411\u5e76\u8054\u4e00\u4e2a\u7eed\u6d41\u4e8c\u6781\u7ba1\u3002\u4e8c\u6781\u7ba1\u6b63\u6781\u63a5 MOSFET \u6f0f\u6781\u4fa7&#xff0c;\u8d1f\u6781\u63a5 VCC \u4fa7\u3002\u5728\u5173\u65ad\u77ac\u95f4&#xff0c;\u4e8c\u6781\u7ba1\u4e3a\u7535\u673a\u7ebf\u5708\u7684\u611f\u5e94\u9ad8\u538b\u63d0\u4f9b\u4e86\u4e00\u6761\u91ca\u653e\u56de\u8def&#xff0c;\u5c06\u5176\u94b3\u4f4d\u5728\u5b89\u5168\u7535\u538b&#xff0c;\u4fdd\u62a4\u4e86 MOSFET 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