https://knightli.com/zh-tw/tags/%E9%A2%A8%E6%89%87%E6%8E%A5%E5%8F%A3%E5%AE%9A%E7%BE%A9/ Recent content in 風扇接口定義 on KnightLi的博客 Hugo -- gohugo.io zh-tw Tue, 06 May 2025 00:00:00 +0000 https://knightli.com/zh-tw/2025/05/06/pwm%E8%AA%BF%E9%80%9F-dc%E8%AA%BF%E9%80%9F-%E9%A2%A8%E6%89%87-%E6%8E%A5%E5%8F%A3%E5%AE%9A%E7%BE%A9/ Tue, 06 May 2025 00:00:00 +0000 https://knightli.com/zh-tw/2025/05/06/pwm%E8%AA%BF%E9%80%9F-dc%E8%AA%BF%E9%80%9F-%E9%A2%A8%E6%89%87-%E6%8E%A5%E5%8F%A3%E5%AE%9A%E7%BE%A9/ <h2 id="接口定義">接口定義 </h2><ul> <li>插座 風扇插座, 2510錯位3+1P 4P風扇散熱針座<br> 4針，3針風扇均可插到這個插座上<br> <img src="https://knightli.com/2025/05/06/pwm%E8%B0%83%E9%80%9F-dc%E8%B0%83%E9%80%9F-%E9%A3%8E%E6%89%87-%E6%8E%A5%E5%8F%A3%E5%AE%9A%E4%B9%89/1.png" width="361" height="489" srcset="https://knightli.com/2025/05/06/pwm%E8%B0%83%E9%80%9F-dc%E8%B0%83%E9%80%9F-%E9%A3%8E%E6%89%87-%E6%8E%A5%E5%8F%A3%E5%AE%9A%E4%B9%89/1_hu_cb6598f08d81425a.png 480w, https://knightli.com/2025/05/06/pwm%E8%B0%83%E9%80%9F-dc%E8%B0%83%E9%80%9F-%E9%A3%8E%E6%89%87-%E6%8E%A5%E5%8F%A3%E5%AE%9A%E4%B9%89/1_hu_40bd393eea2784e5.png 1024w" loading="lazy" class="gallery-image" data-flex-grow="73" data-flex-basis="177px" ></li> <li>4針風扇插座 <br> <img src="https://knightli.com/2025/05/06/pwm%E8%B0%83%E9%80%9F-dc%E8%B0%83%E9%80%9F-%E9%A3%8E%E6%89%87-%E6%8E%A5%E5%8F%A3%E5%AE%9A%E4%B9%89/2.png" width="347" height="597" srcset="https://knightli.com/2025/05/06/pwm%E8%B0%83%E9%80%9F-dc%E8%B0%83%E9%80%9F-%E9%A3%8E%E6%89%87-%E6%8E%A5%E5%8F%A3%E5%AE%9A%E4%B9%89/2_hu_7b5cd10916131315.png 480w, https://knightli.com/2025/05/06/pwm%E8%B0%83%E9%80%9F-dc%E8%B0%83%E9%80%9F-%E9%A3%8E%E6%89%87-%E6%8E%A5%E5%8F%A3%E5%AE%9A%E4%B9%89/2_hu_bebeeeae615f720a.png 1024w" loading="lazy" class="gallery-image" data-flex-grow="58" data-flex-basis="139px" ></li> <li>3針風扇插座 <br> <img src="https://knightli.com/2025/05/06/pwm%E8%B0%83%E9%80%9F-dc%E8%B0%83%E9%80%9F-%E9%A3%8E%E6%89%87-%E6%8E%A5%E5%8F%A3%E5%AE%9A%E4%B9%89/3.png" width="311" height="341" srcset="https://knightli.com/2025/05/06/pwm%E8%B0%83%E9%80%9F-dc%E8%B0%83%E9%80%9F-%E9%A3%8E%E6%89%87-%E6%8E%A5%E5%8F%A3%E5%AE%9A%E4%B9%89/3_hu_7e75f7c9c82c93f7.png 480w, https://knightli.com/2025/05/06/pwm%E8%B0%83%E9%80%9F-dc%E8%B0%83%E9%80%9F-%E9%A3%8E%E6%89%87-%E6%8E%A5%E5%8F%A3%E5%AE%9A%E4%B9%89/3_hu_2f76c3b465e21cd.png 1024w" loading="lazy" class="gallery-image" data-flex-grow="91" data-flex-basis="218px" ></li> </ul> <h2 id="測速">測速 </h2><p>TACH, FG轉速信號 通過這個針腳測速 散熱風扇的FG信號是連續方波信號，反映風扇實時轉速.<br> 一般無刷電機是4個磁級對數，FG信號的方波與磁級對有關。4個磁極對風扇，2個周期表示轉了一圈，也可以理解為當計數器檢測到2個高電平時，風扇轉一圈，6個磁級對數，即為檢測到3個周期表示風扇轉一圈，即3個高電平。<br> 風扇轉速單位一般是轉數/每分鐘, 所以對於4個磁極對風扇, 轉速=FG頻率<em>30, 對於6個磁極對風扇, 轉速=FG頻率</em>20</p> <h2 id="dc調速">DC調速 </h2><p>通過調整風扇供電的電壓實現調速</p> <h2 id="pwm調速">PWM調速 </h2><h3 id="pwm信號佔空比">PWM信號佔空比 </h3><p><img src="https://knightli.com/2025/05/06/pwm%E8%B0%83%E9%80%9F-dc%E8%B0%83%E9%80%9F-%E9%A3%8E%E6%89%87-%E6%8E%A5%E5%8F%A3%E5%AE%9A%E4%B9%89/4.png" width="1867" height="651" srcset="https://knightli.com/2025/05/06/pwm%E8%B0%83%E9%80%9F-dc%E8%B0%83%E9%80%9F-%E9%A3%8E%E6%89%87-%E6%8E%A5%E5%8F%A3%E5%AE%9A%E4%B9%89/4_hu_9abb7044887388d6.png 480w, https://knightli.com/2025/05/06/pwm%E8%B0%83%E9%80%9F-dc%E8%B0%83%E9%80%9F-%E9%A3%8E%E6%89%87-%E6%8E%A5%E5%8F%A3%E5%AE%9A%E4%B9%89/4_hu_da6b57b833752ee.png 1024w" loading="lazy" class="gallery-image" data-flex-grow="286" data-flex-basis="688px" ></p> <p>佔空比D定義為脈衝持續時間（τ）與方波周期（T）的比值。</p> <p>PWM調速通過改變PWM引腳信號的佔空比（Duty Cycle），即脈衝信號高電平的時間佔整個周期的比例，來控制風扇的轉速。例如：<br> 100% 佔空比 → 風扇全速運轉<br> 50% 佔空比 → 風扇半速運行<br> 0% 佔空比 → 風扇停止</p> <h3 id="pwm信號頻率">PWM信號頻率 </h3><p>PWM調速頻率指的是PWM信號的開關頻率，即單位時間內脈衝信號切換的次數，通常以赫茲（Hz）表示。例如，PWM調速頻率為20kHz，表示PWM信號每秒鐘切換20000次。</p> <p>常見的PWM風扇調速頻率範圍：<br> 低頻：1kHz<del>5kHz（部分舊款風扇使用）<br> 標準頻率：20kHz</del>30kHz（大部分高性能風扇使用）<br> 高頻：&gt;30kHz（部分靜音風扇或特殊用途風扇）</p> <h3 id="pwm信號幅值">PWM信號幅值 </h3><p>PWM的幅值是指高電平和低電平之間的電壓差異。一般來說，常見的PWM幅值為3.3伏特（V）或5伏特（V），但具體要求取決於風扇的規格和設計。在選擇寬值時，需要確保PWM信號能夠被風扇正確理解和響應。可以參考風扇的規格書或製作製造商提供的技術資料，了解了使用風扇的PWM幅值要求。</p>