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ltg
Joined: 24 Feb 2002
Posts: 75
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 15 Sep 2003 20:21 Center aligned pwm how can I create it? |
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Thanks very much for your tips!
Best Regards,
ltg
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crazyduck
Joined: 03 Sep 2001
Posts: 274
Helped: 5
Location: France
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| 15 Sep 2003 20:24 Re: Center aligned pwm how can I create it? |
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Hello,
You can use a multivibrator with NE555 or with CMOS4093.
CD:)
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bomba
Joined: 09 Sep 2003
Posts: 136
Helped: 1
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| 15 Sep 2003 21:08 Re: Center aligned pwm how can I create it? |
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| you can use the lm3524, this IC provide the pulse corresponding to one of the transistor an for the second transistor of a half-bridge. But you can obtain only one center aligned PWM, with external configuration. You must to notice the dead time.
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ash
Joined: 25 Dec 2002
Posts: 160
Location: Europe
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| 15 Sep 2003 23:23 |
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| I think the best way is using microcontroller because microcontrollers are very flexible for your application.
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ltg
Joined: 24 Feb 2002
Posts: 75
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| 16 Sep 2003 20:01 |
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Hi,
Thanks very much for your tips! Yes, I use microcontroller but it only provides edge aligned pwm. With center aligned pwm I can use space vector pwm, which is more efficient than sinusoidal pwm. I don't know how to create center aligned pwm with the traditionally microcontrollers.
Best Regards,
ltg
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ash
Joined: 25 Dec 2002
Posts: 160
Location: Europe
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| 16 Sep 2003 21:44 |
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Hi ltg,
It's easy to implement software pwm with microcontrollers. You can find source codes for software edge aligned pwm (i have had the codes for microchip's pic micros but my disk crashed, sorry i can't help you more) and after few computations i think you can write your software center aligned pwm codes. You should use your micro for ONLY pwm function, if you want to implement not only pwm but also other computations (like pid) use another micro as master chip.
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