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硬件电路设计学习笔记--MOS管做电源开关

  • 2026-05-24 13:50:28
硬件电路设计学习笔记--MOS管做电源开关

一、Nmos做 电源 开关

电路分析

仿真 效果验证

开关未闭合

开关闭合

如何让其处于一直饱和导通？

  • 使用自举电容
  • 使用一个比电源更高的控制信号来控制mos管的栅极g这里主要讲使用自举电容

使用 自举电容

利用电容两端电压不能突变的特性

电路分析

仿真效果验证

二、Pmos做电源开关

利用Pmos源极s接电源的特性导通条件:Vg-Vs<Vth

仿真效果

开关未闭合

开关闭合

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      1. CONNECT:[ UseTime:0.000520s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
      2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000808s ]
      3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000314s ]
      4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000289s ]
      5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000475s ]
      6. SELECT * FROM `set` [ RunTime:0.000200s ]
      7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000570s ]
      8. SELECT * FROM `article` WHERE `id` = 490471 LIMIT 1 [ RunTime:0.000365s ]
      9. UPDATE `article` SET `lasttime` = 1779661089 WHERE `id` = 490471 [ RunTime:0.014249s ]
      10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000306s ]
      11. SELECT * FROM `article` WHERE `id` < 490471 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000487s ]
      12. SELECT * FROM `article` WHERE `id` > 490471 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003777s ]
      13. SELECT * FROM `article` WHERE `id` < 490471 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005472s ]
      14. SELECT * FROM `article` WHERE `id` < 490471 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003780s ]
      15. SELECT * FROM `article` WHERE `id` < 490471 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.011885s ]
      0.112269s