Inverter improvements?
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Posted by John Popelish on August 28, 2008, 11:58 am
Please log in for more thread options lerameur wrote: I don't understand "to get the duty cycle synchronyse". Exactly what do you want the two gate signals to do? Are you after 50% duty cycle except that the two MOSFETs not overlap their conduction? Or do you need variable duty cycle on each gate (either with the sum of their duty cycles adding up to 100% or with equal duty cycles with variable dead time when neither gate is on? I don't know your design goals, so it is difficult for me to give advice. -- Regards, John Popelish | ||||||||||||||||||||||||||||||||||
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Posted by lerameur on August 28, 2008, 1:11 pm
Please log in for more thread options > lerameur wrote:
> > I will be driving this from a microcontroller, I could not get a good
> > software approach, to get the duty cycle synchronyse. It is better to > > do it hardware. I might make the output of the micro drive a 2n2222 to > > activate the opto, then I will have to find a solution to control the > > other opto. >
> I don't understand "to get the duty cycle synchronyse". > > Exactly what do you want the two gate signals to do? > > Are you after 50% duty cycle except that the two MOSFETs not > overlap their conduction? =A0Or do you need variable duty > cycle on each gate (either with the sum of their duty cycles > adding up to 100% or with equal duty cycles with variable > dead time when neither gate is on? > > I don't know your design goals, so it is difficult for me to > give advice. > > -- > Regards, > > John Popelish I just need 50%, one mosfet turns on the first half and the other turns on the other 50%, therefore always one turned on. (In a microcontroller I could not get only the second half to activate) Ken | ||||||||||||||||||||||||||||||||||
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Posted by lerameur on August 28, 2008, 1:24 pm
Please log in for more thread options
>
> > > > lerameur wrote:
> > > I will be driving this from a microcontroller, I could not get a good
o
> > > software approach, to get the duty cycle synchronyse. It is better to > > > do it hardware. I might make the output of the micro drive a 2n2222 t= > > > activate the opto, then I will have to find a solution to control the
> > > other opto. >
> > I don't understand "to get the duty cycle synchronyse".
>
> > Exactly what do you want the two gate signals to do?
>
> > Are you after 50% duty cycle except that the two MOSFETs not
> > overlap their conduction? =A0Or do you need variable duty > > cycle on each gate (either with the sum of their duty cycles > > adding up to 100% or with equal duty cycles with variable > > dead time when neither gate is on? >
> > I don't know your design goals, so it is difficult for me to
> > give advice. >
> > --
> > Regards, >
> > John Popelish
>
> I just need 50%, one mosfet turns on the first half and the other > turns on the other 50%, therefore always one turned on. > (In a microcontroller I could not get only the second half to > activate) > > Ken Ok I added it anyway: http://picasaweb.google.com/Kronmaster/ElectronicMisc/photo#523962020566806= 7362 K | ||||||||||||||||||||||||||||||||||
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> software approach, to get the duty cycle synchronyse. It is better to
> do it hardware. I might make the output of the micro drive a 2n2222 to
> activate the opto, then I will have to find a solution to control the
> other opto.