Haggis and Neeps

Thanks for the advice. Seems like a TL494 is the way to go as it appears to have all of the functions. My revised circuit thoughts are: Voltage reg - sinewave generator(50Hz)-TL494-op amp/s- power mosfets-centre tapped HF transformers. I'm hoping I've finally figured the basics out? I've done a little bit of research and it appears that instead of PWM it is possible to utilise a variable DC source. Any thoughts on this? Thanks in advance.

I'll bin my initial idea. Seems PWM is the way to go. How could I provide a "sensing" circuit for the 555 oscillator so that I can vary the pulse widths on the back of a reference sine wave. I think I can do the circuitry at the 555 side? Would I use some kind of function generator/ sinewave generator? If so, is it possible to get this circuit to communicate with the 555? Is there a risk that the PWM in an inverter when compensating for high loads may just produce a monolithic waveform(semi-square)? Ultimately I'm after reliability, ruggedness and simplicity(i'm sure that's every amateur's dream). Any thoughts, as I'm a real novice(but keen to learn).

Many thanks for the advice. I have had several of the inexpensive(cheap) AC-DC inverters and they have all failed when used with multiple loads/ and or inductive loads(motors, etc). Even when the inverter rating exceeds twice that of the total loads i.e 1Kw load, 2Kw Inverter(4Kw Surge Capacity). Generally it is the Mosfets that fail(12volt side).This then cases a cascading burn out of the Mosfets which can be very expensive to repair. I think this is priimarily caused by the small size of the inverter coils. The phsical size of the coils appear to be around the 12VA capacity(PCB mounted).Even with 8 coils in a 2Kw inverter then this effectively only gives a 96VA capacity. My thinking for the design is that the power handling is a dirrect function of the transformers/s mass. Would it be feasible to chop the DC in my inverter design at 50Hz through parralleled high power Mosfets. Some of these high power Mosfets can handle 300Amps(pulsed). Would the current phase be in unison with the voltage phase in my proposal? I'm assuming that the voltage would drop with load so I would have to design a voltage correction element to the circuit? Am I flogging a dead horse with this idea? Many thanks /I maybe asking pointless questions so I apologise in advance.

Can anyone offer some guidance to a newbie? Q- i'm trying to develop an 12v DC-230v AC 50Hz inverter. I'm staring with a 555ic as a simple base(no doubt I will have many unsuccefful attempts hence the "affordable(cheap)" nature of the circuit). Here's what I was thinking: Voltage Regulator->555ic -> Low Power NPN and PNP transistor driving larger parralled High Power Mosfets -. transient suppressors/filters-> 12v-230v step up Transformer -> transient suppressors/filters This I hope would give a basic inverter(square wave). I'm really looking to develop a quasi sinewave by having multiple square waves with different duty cycles overlayed upon each other on the carrier frequency (50Hz). What would the easiest way of doing this? I know from experience that the commercial quasi sinewave inverters use a 556ic to generate two square waves on the carrier frequency. Would it be possible to harmoinies multiple 555 ics in one circuit so that I could effectively piggyback multiple inverter circuits to give a relatively smoth sinewave? So many Q's? Many thanks in advance if you can help. Thanks.