AVR-Chat

hi robert:
sorry, i skip some description.my motor is a linear synchronous motor(LSM)
 
(1) first i do a single phase hbridge cct which use 2 pchannel(high side) n 2 nchannel(low side) power mosfet.left high side mosfet(drain) is connected to gate of right low side mosfet. right hide side mosfet (drain) is connected to left low side(gate) mosfet. which means when left high side mosfet is on, then right low side mosfet will also on. same with right high side mosfet n left low side mosfet will on together in next stage. i use 2 BJT to switching both high side pchannel mosfet.so i set two output from 8535 chip to the BJT throug 2 optocoupler without using IR2110. everything goes find except i cant get purely squarewave output. so any suggestions on the commands which can generate the squarewave waveforms.
 
(2) after that i will try 3 phase by building 3 set of the hbridge cct above so totally 12 mosfet.
    my professor ask me to do this instead of just using 6 mosfet in a cct...
 
(3) later only i will try use IR2110 to directly switching the 4 mosfet in single phase hbridge cct without using 2 BJT....and then later switching 12 mosfet from output of the chip....but i m new in IR2110 and dont know how to use it correctly...i dont know how to connect the Vb,Vcc,Vs,Vdd,Vss and what voltage to supply them?
 
 
(4) yes i have to connect optocouple 4N26 between IR2110 and 8535chip to protect the chip coz later the supply voltage to 3phase cct may goes up to 100V (10A)..no choice...
 
(5) my motor power supply is separated from the control power supply... 
 
thanks again
 
from kim
 

Robert Adsett <subscriptions@aeolusdevelopment.com> wrote:
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


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