Question on making inverter using TL494

Is the output frequency equal to this oscillator frequency ?

That would seem a reasonable assumption in the absence of any information to the contrary in the data sheet.
With this sort of thing the best approach is to build up a circuit from the application notes first just to get familliar with the chip.
I have met some chips where the application notes were worse than useless (sepcifically oner chip for pwm psu/battery charger was a complete wase of space and I ended up builing my own discrete component cct .
I find National Semiconductor and Maxim usually have reliable ap' notes and data.
Del

An R and C are connected to form an oscillator. If you need variable F or sync to a critical F, you can usually drive one of the RC pins from an external oscillator.

Data sheet and tech notes have all the info you need. The values and resulting frequency are shown on a chart. Primary PWM switching frequency is usually the RC frequency from this chart or a given equation.

http://focus.ti.com/lit/ds/symlink/tl494.pdf

find out who makes this. There will be many makers of this part. Search their data library for application notes that show an actual application. Some might have just what you want.

then search. this search gave over 5000 hits, look through them

http://www.google.ca/#hl=en&source=hp&q=TL494+%2Binverter+%2Bcircuit&btnG=Google+Search&meta=&aq=f&oq=TL494+%2Binverter+%2Bcircuit&fp=4bd26c1f505ba07b

Hi guest;

The answer is no, tipically the inverters have a fix "carrier" frequency of about 10 Khz; the app notes only give you the option of keeping this internal oscillator or by-pass it.

What is going to control your output frequency, is the shape of the wave form from your control input, if you connect a scope to your inverter's output you will see the same 10 Khz but with a variable pulse width, measure the period from one max width pulse to the next max width pulse and the inverse will be the output freq.

Yahlasit

Please READ the data sheet (link) I posted above. It clearly indicates that this IC requires external RC components to define the PWM clock frequency. Recommended clock frequency range is from 1kHz to 300kHz.

The frequency you set with Rt and Ct is the PWM switching frequency nothing to do with inverter output frequency, Topology I would use is HV doubling rectification (2 diodes and 3 caps) and use both outputs of tl494 shorted to be able to go up to 90% PWM ratio and a cirquit to modulate a low distortion "full rectification representation" of your desired output wave , and a divide by two toggling to two no overlap gate half H-bridge driving ics at desired wave's zero cross, 4 diode shunt IGBT's for output, V correcting and I limiting feedback. 15+ Khz PWM is OK for most IGBTs inaudible and easily filtered. This gives good efficiency but NO mains isolation. If anything seems unclear to you forget project lost of trembling involved

ref Data Sheet...again...

The TL494 is basically a DC-DC switching power supply controller IC that uses feedback to PWM the power switches to maintain a fixed(regulated) DC output voltage.

It is possible to use this device to generate a PWM "AC" output, but that function is best done with a part DESIGNED to generate AC waveforms.

Like this one...

http://www.freescale.com/files/microcontrollers/doc/data_sheet/MC3PHAC.pdf

True that;s why I tried to describe with my poor Englisk how complicated is to achieve it and was talking for single phase right? By the way to fix a typo lost =lots