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thanks Les Jones , I have one more question ,This is a web page with information on designing sine wave oscillators using Op Amps. The theory should work with most Op Amps.**broken link removed** gives information on square wave oscillators.
Les.
I'm intending to drive two MOSFETs , could be more depending on the wattage I want on the outputIf using a 12V car battery, make sure to include a fuse.
What are you intending to drive with the oscillator? An LM324 can only source/sink a few mA.
but that would give a 100kHz at the 220v side no ?Driving the MOSFETs with 50Hz would result in severe heating. The normal way is to use high frequency (e.g >100kHz) PWM to drive them, with the PWM duty-cycle varied at 50Hz.
so what do you suggest ? a square wave ?Also, you want pulses to drive the gates of the FETs with very fast rise and fall times; not sine waves...
yeah, you filter that out...and that filter wont filter the 50hz bit out cuzz its lower frequbut that would give a 100kHz at the 220v side no ?
aright pal I really appreciate ithaving a 50hz sine wave is a good idea because you can feed it into a pwm comparator, and let it modulate the pwm duty cycle of a pwm output, then this will switch current into the inverter inductor, and give you your 50hz power wave.....ill try and dig out a sim in ltspice out for you to show what i mean...back soon.....got to go to shop now though b4 they close up.
thanks palhere is the sinusoidal pwm sim in an inverter (LTspice)
A square wave would do just fine and the output voltage of the LM324 doesn't really matter because the MOSFETs are voltage based and can be driven by a very low voltage.Still not clear what you are trying to do. Sine wave? Square? Triangle? Saw? Pulse?
What is the intended outut of the LM324 circuit, and what is the intended output of the overall project?
ak