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h-bridge configuration for higher current rating

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harshas

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well..here goes my problem....
i'm trying to control the speed of a dc motor with a very high current rating(lets say 16A).i vud want to control it with a modified form of the conventional h-bridge(as the conventional h-bridge vud literally fry the mosfet connected to the supply).

i do not want to use any h-bridge drivers already available in the market as they are quite expensive for the current rating that i'm looking at.and of course i'm planning to use PWM for the speed control.

so cud anyone help me out of this??
 

Why would it fry the mosfet connected to the supply?
try to find high current mosfets (N-MOS), good decoupling allways help and protection diodes are a good idea too, a snubber helps and you could consider putting two or more mos in parallel
 

You most likely fry your mosfets since they are all conducting at some moment in time during your PWM signal !!!..

Paul.
 

well what if i tell u that even with 100%duty cycle also the mosfets are getting damn hot???
 

Hi,

Simply take MOSFET's with 5 or 10mOhm resistance !. They can't get hot !!.

Paul.
 

GO FOR SOME MOSFETS. SEE THIS LINK ALSO. SEE THE IDmax of the mos and design it
**broken link removed**

Bibin John
www.bibinjohn.tk
 

Great topic and great files !!

Anyone know about a good all N Channel MOSFET H Bridge design ?

I am reallt looking forward to one. This may help you too.
 

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