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York Jong

「單」晶片控制多組 PWMs - 160 views

作者: ykjiang (York) 看板: Robotics 標題: Re: 「單」晶片控制多組 PWMs 時間: Wed Dec 13 00:17:04 2006 ※ 引述《happosai (八方齋)》之銘言： > 其實用 FPPA 產生 PWM 訊號一點都不難,因為那一顆CPU就只負責 > 產生PWM訊號，講白一點都是死迴圈，真正 update PWM 是另外一顆 > 負責，所以程...

embedded motor pwm

started by York Jong on 28 May 07 8 follow-ups, last by York Jong on 28 May 07
York Jong

[Blog] Motor-controlling PWMs - 43 views

作者: ykjiang (York) 看板: Robotics 標題: [Blog] Motor-controlling PWMs 時間: Mon Dec 18 17:21:33 2006 Motor-controlling PWMs http://yukuan.blogspot.com/2006/12/motor-controlling-pwms.html 一個脈寬調變（Pulse-...

embedded motor pwm

started by York Jong on 28 May 07 no follow-up yet
York Jong

電池驅動的馬達 - 38 views

作者: ykjiang (York) 看板: Robotics 標題: 電池驅動的馬達 時間: Sun Dec 10 14:33:26 2006 既然聊到了以 PWM 控制馬達， 就順便簡單整理一下常用來驅動機器人的馬達： ※直流馬達（DC Motors） 就是靠直流驅動的馬達。 不同大小的電壓可以控制轉速；不同的通電方向，可以決定轉向。 通常直流馬達都是有刷的（brushed），會...

battery dc motor

started by York Jong on 28 May 07 no follow-up yet
York Jong

Robot Room - IRB and Roundabout Resourcess - 0 views

www.robotroom.com/IRBGoodies.html

book errata robot

shared by York Jong on 09 Sep 07 - Cached
  • "Exposing a Flaw: Shoot-Through" describes the serious problem with that circuit, especially when pulsed
  • Above is an improved version of the circuit, which is now PWM compatible. PWM, coast mode, and the capability to avoid shoot-through are provided by adding a fifth MOSFET (labeled Q5) to the source/ground connections of Q1 and Q3.
  • ...1 more annotation...
  • By default at power-up, the circuit is in coast mode. To brake, set IN A to 0 V, IN B to 0 V, and Q5 to 5 V. To spin clockwise, set IN A to 5 V, IN B to 0 V, and Q5 to 5 V. To spin counterclockwise, set IN A to 0 V, IN B to 5 V, and Q5 to 5 V. At any time you can return to coast by applying 0 V to Q5. Or, you can apply pulses of 0 V/5 V/0 V/5 V (and so on) to control the speed. The more time spent at 5 V, the faster the motor will spin. Whenever you change modes, if you set Q5 to 0 V before making changes to IN A and IN B (and then set Q5 back to 5 V or pulsing) there will be no shoot-through.
  • York Jong on 09 Sep 07
     
    This secret page is for owners of the book, Intermediate Robot Building. On this page, you'll find updates, corrections, and source files. Thank you for buying the book!
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