Power amplifier using flyback converter

It sounds strange to me to connect the AC output to the input transformer. Could you post the schematic?

Well am not good at schematics but I hope you understand this. 

are you using a distributed air gap toroidal core? 

aslo, the MOSFET placement isn't correct. I'll do a bit of self-promotion here with this guide of flyback converters which might help you /search?q=Experimenting%20with%20Flyback%20Transformers%20#serpauthor=438987&serpcategory=blog&serpgroup=445 

that blog series covers everything you need to know to get a flyback converter up and running and is very beginner-friendly

Am not good at schematics.

But you should know that the PWM is connected to the gate 

yeah, that's not the problem, if you're using an N channel fet, you connect the positive of the DC source to the first pin of the transformer primary, and the other pin goes to drain, and you connect source to ground. the connection shown in your drawing doesn't seem to be doing that

Let say am using a reference node 

if not familiar with component symbols, please draw the components as they are physically connected and mark the toroid windings with colors to see which winding connects to what. 

i would again recommend you read the flyback blogs i shared. flyback converters are one of the simplest dc to dc converter topologies to learn, even if you only have a basic understanding of electronics.

if not familiar with component symbols, please draw the components as they are physically connected and mark the toroid windings with colors to see which winding connects to what. 

i would again recommend you read the flyback blogs i shared. flyback converters are one of the simplest dc to dc converter topologies to learn, even if you only have a basic understanding of electronics.

Do you think I have time 

do you think we have time to try to decipher your drawing and engineer a solution for you for free? especially after that response? good luck in your endeavours!

That's very rude considering people are trying to help you.

Your diagram doesn't use standard symbols, and it's impossible for anyone to get inside your mind to understand precisely what was meant by each part of your diagram.

You would need to put into standard symbols that everyone can understand, or try the approach of sketching the actual connections, rather than that pseudo-"diagram" you have currently.

It's like language; if you're speaking a different language, how can anyone help without it being translated? Your diagram needs to be translated, and there's no translator in the world that can do that if you're using your own unique terminology that is only known to you.

I can't do that now because of my battery situation. Sorry if you think am rude. And in my country electricity isn't that good in my area. At this time in our country we are in the night presently with no electricity.

Maybe during the day I will try but it may look rough 

Your battery situation is limited. The resources in the E14 community are limited. Step back and think how can you best maximize both limited resources? 

The community needs information (i.e. accurate).

What are you trying to accomplish? Build a circuit? Repair a circuit? Reverse engineer a circuit?

Also, what loads is it intended for?

Often the most efficient way might be different, because many appliances have inefficiencies too, when they have to step-down from AC back to a lower DC supply. It's getting possible to power a lot of equipment directly from DC, e.g. 24V, for instance,

USB-C offers 100W or so to laptops to power directly, and USB-C can operate from a 12V or 24V source. Similarly, a lot of office lighting now works with DC (Power over Ethernet), so even if PoE is not used, there is still good precedent for operating room lighting at low voltage, even if there are two sets of lighting, one for when AC power is available.

.You may find the options are very good for powering a lot of equipment from a DC source (one or more car batteries for 12, 24 or higher voltage), and save a lot of energy due to fewer conversions, leaving any conversion to AC for the remaining few devices.

Well I tried drawing but it was rough so I downloaded any simulator. Please am still sorry for the other time.

I think you might understand it.

And my current simulator doesn't has 2 output secondary coil, so I had to do some weird connection. But the result is the toroidal transformer. Have tried drawing current through the coils and the flyback voltage doesn't reach the required voltage. The output is not stable.

This is what I need help on.

Thanks in advance: 

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I took a quick look, and couldn't figure out how this could work. You've got primary side on the left side it seems, but also connected that primary winding in parallel (through D1 to some H-bridge output from the right-side circuitry, while at the same time, the H-bridge input is also connected to the primary (through D2 and D1).

I doubt that software will simulate this, you may have to just try your experiement for real if you're convinced it can be made to work and be more efficient (I'm not convinced). The links from  Anthocyanina are about the most straightforward explanation that exists on the Internet today. You can also look at my more cut-down explanation here: Fun with Flybacks: Building a 600V Supply which doesn't cover as much.

You could start with a scaled-down experiment, building one part at a time, because the entire circuit as it is won't work, and then you'll have no idea what part is wrong, because all are connected together as mentioned earlier. By looking at those blogs, you can see a similar strategy; things were incrementally built and tested. So, for any success, you'd have to build and test bit-by-bit. If the scaled-down circuit doesn't work, then you know that the larger circuit will not work. You will definitely need an oscilloscope if you have not already got one; it will be extremely difficult to experiment without one.

Instead of a large toroidal transformer, you can buy a small, cheap multi-winding 1:1 ratio transformer, see "Hexa-Path" transformers, for instance, and use as many windings from there as you need. Such a scaled-down experiment would need to be done at a higher frequency than 50/60Hz, perhaps 20 kHz or more.

I wanted to use a large Toroidal transformer for high inductance and high fly back voltage.

But thanks  for everything and I will try doing bit by bit. And you are right, I don't have an oscilloscope, making it hard for me to try it 

if you don't have access to an oscilloscope, simulations are your friend. with simulations and a multimeter you could still get a good idea of what the circuit is doing. as shabaz said, the circuit as you drew it will not work. 

first, the MOSFET placement is wrong. To operate the MOSFET, you need to apply a voltage to the gate, referenced to the source. In your drawing the source isn't at ground potential so the voltage you are applying to the gate is not the Vgs the MOSFET will see. 

second, the diode D1 will always discharge the capacitors through the winding of the transformer tied to its cathode, if the capacitors are ever charged at all, as the circuit will close to ground through what you labelled "M1".

third, what you labelled as output will not be a DC output, and ignoring everything else, if this was a working flyback converter, if you were to conenct a load to what you labelled as output, it will result in immediate energy transfer as there isn't anything (a diode) blocking the current path during the on portion of the cycle, so the circuit wouldn't be operating as a flyback at all and energy transfer would be incredibly inefficient to the load connected to "output".

i would recommend you first read on how to get a single output flyback converter running, then some reading on the working principle of the H bridge, and then build a simple flyback converter to explore how it works, then try to tie both sections together. 

again, if you don't have access to an oscilloscope, simulations are a great aid, and if you have a multimeter, that together with the simulations should be enough to get your flyback up and running, maybe not ideally, but still can get you a working converter.