Inverter improvements?
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Posted by lerameur on August 28, 2008, 9:39 am
Please log in for more thread options Hello, I have an inverter circuit, although I learn that hooking a load directly to its output is not working. I was not sure if I should use an opAmp or mosfet, I have the circuit below, any improvment? anybetter way to do it. The load I want to add is to drive a mosfet Yes some people will say not to use the same power supply on both sides of the optocouplers ,but this is just for the simulation. http://picasaweb.google.com/Kronmaster/ElectronicMisc/photo#5239559852433461314 | ||||||||||||||||||||||||||||||||||
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Posted by cope2008@gmail.com on August 28, 2008, 10:30 am
Please log in for more thread options On 8=D4=C228=C8=D5, =CF=C2=CE=E79=CA=B139=B7=D6, lerameur <leram...@yahoo.c= | ||||||||||||||||||||||||||||||||||
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Posted by lerameur on August 28, 2008, 10:39 am
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> On 8=D4=C228=C8=D5, =CF=C2=CE=E79=CA=B139=B7=D6, lerameur <leram...@yahoo=
.com> wrote:> Hello, > > > I have an inverter circuit, although I learn that hooking a load
> > directly to its output is not working. > > I was not sure if I should use an opAmp or mosfet, I have the circuit > > below, any improvment? anybetter way to do it. The load I want to add > > is to drive a mosfet > > Yes some people will say not to use the same power supply on both > > sides of the optocouplers ,but this is just for the simulation. >
> >http://picasaweb.google.com/Kronmaster/ElectronicMisc/photo#523955985
>
> your simulation is ok? yep, turn on and off the 5v supply on the left and the assigned mosfet turns on and off. I posted the same circuit twice with the two possible conditions. to show that is works. Is there a way to reduce the current that goes into the opto? without affecting the output, maybe replace the opto... K | ||||||||||||||||||||||||||||||||||
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Posted by John Popelish on August 28, 2008, 11:40 am
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lerameur wrote: > Hello,
> > I have an inverter circuit, although I learn that hooking a load > directly to its output is not working. > I was not sure if I should use an opAmp or mosfet, I have the circuit > below, any improvment? anybetter way to do it. The load I want to add > is to drive a mosfet > Yes some people will say not to use the same power supply on both > sides of the optocouplers ,but this is just for the simulation. Your complementary mosfets are not a very good way to translate a 5 volt logic signal to a 6 volt LED drive. That is a lot of parts to turn on one coupler when the logic input is high and the other one when it is low. Or am I missing some other intended function? I think I would use an NPN follower to drive one coupler through a 270 ohm resistor to the negative side of the 5 volt logic supply and a PNP follower to drive the other one through a 270 ohm resistor to the positive side of the 5 volt logic supply. Those two transistors and two resistors replace everything on the schematic except the couplers and the output resistors. > http://picasaweb.google.com/Kronmaster/ElectronicMisc/photo#5239559852433461314
-- Regards, John Popelish | ||||||||||||||||||||||||||||||||||
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Posted by lerameur on August 28, 2008, 11:46 am
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> lerameur wrote:
> > Hello,
>
> > I have an inverter circuit, although I learn that hooking a load
> > directly to its output is not working. > > I was not sure if I should use an opAmp or mosfet, I have the circuit > > below, any improvment? anybetter way to do it. The load I want to add > > is to drive a mosfet > > Yes some people will say not to use the same power supply on both > > sides of the optocouplers ,but =A0this is just for the simulation. >
> Your complementary mosfets are not a very good way to > translate a 5 volt logic signal to a 6 volt LED drive. > > That is a lot of parts to turn on one coupler when the logic > input is high and the other one when it is low. =A0Or am I > missing some other intended function? 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. k | ||||||||||||||||||||||||||||||||||
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> Hello,
>
> I have an inverter circuit, although I learn that hooking a load
> directly to its output is not working.
> I was not sure if I should use an opAmp or mosfet, I have the circuit
> below, any improvment? anybetter way to do it. The load I want to add
> is to drive a mosfet
> Yes some people will say not to use the same power supply on both
> sides of the optocouplers ,but this is just for the simulation.
>
> http://picasaweb.google.com/Kronmaster/ElectronicMisc/photo#523955985