AVR-Chat

At 07:15 PM 12/9/04 -0800, you wrote:
>dear all:
>
>i m using bascom AVR and AtMega8535 chip to program to switching the 4 
>mosfet on off in a Hbridge cct. i want to generate ac squarewave output 
>from the Hbridge cct but i cant get it because it look like not square 
>completely.the output is to control a motor(15V 2A) in 50 Hz.

<snip>

>
>         one output is to 2 mosfet. can anyone suggest other command other 
> than the above one? coz the timing may be not accurate.later i want to 
> switching 12 mosfet so i cant use PWM command.

I don't follow you here.  If it is still an H bridge than the number of 
MOSFETs in it isn't particularly relevant to whether or not you use a 
PWM.  The only other interpretation I make of this would involve a 6 phase 
setup and that seems irregular as well.

>
>(2) have anyone use IR2110 mosfet driver before.i am using it now but it 
>is complicated in connection. i need to connect the chip to optocoupler to 
>mosfet driver and then to the mosfet.

You are using an optocoupler to drive a 2110?  That seems ummm..., 
unusual... Is your motor power supply floating relative to your control 
power supply?

Also 50Hz strikes me as awfully slow for a 2110 unless you are running a 
floating power supply for the high side gate drive.

Robert

" 'Freedom' has no meaning of itself.  There are always restrictions,
be they legal, genetic, or physical.  If you don't believe me, try to
chew a radio signal. "

                         Kelvin Throop, III