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. 

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.

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.

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.