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Inverter improvements?

L

lerameur

Jan 1, 1970
0
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
 
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?
 
L

lerameur

Jan 1, 1970
0
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
 
L

lerameur

Jan 1, 1970
0
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 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
 
L

lerameur

Jan 1, 1970
0
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.

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
 

neon

Oct 21, 2006
1,325
Joined
Oct 21, 2006
Messages
1,325
power transfered is during rise and fall not duty cycles. and why using optocoupler if you intend to drive them from a common PS. lame idea.
 
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