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This is square wave output.Options ...
1) Slow down the existing circuit to 60 hz
Yes! If you use the existing...remove the 60hz osc and use feedback.2) Use the existing circuit to create steady 165V DC which then feeds an H-Bridge to create 60Hz AC.
This was mentioned in post #3.4kHz seems way too low? Why choose 4kHz for the PWM frequency?
4kHz seems way too low? Why choose 4kHz for the PWM frequency?
This is square wave output.
It may be possible to use the 60HZ to modulate the intermediate 165 DC Voltage. Then use an H-Bridge to create the 60 Hz AC. It is an option. One issue with modulating the intermediate DC votage is it will not drain to 0 Volts when there is no load. Maybe an issue maybe not.Yes! If you use the existing...remove the 60hz osc and use feedback.
Yes, that is a Square Wave. But that is what a PWM creates. The wave can be "shaped" with an Iron Transformer, Inductors and Capacitors into something resembling an AC Sine wave. Sort of like turning a lump of coal into a diamond. The thread title does not say "PURE" sine wave. I would not go this route but it is an option with the circuit presented.
It may be possible to use the 60HZ to modulate the intermediate 165 DC Voltage. Then use an H-Bridge to create the 60 Hz AC. It is an option. One issue with modulating the intermediate DC votage is it will not drain to 0 Volts when there is no load. Maybe an issue maybe not.
If you go with the Regulated Intermediate 165 volts DC then remove the AC input signal, add (-) feedback, increase the frequency and do whatever else is needed to get the DC-DC converter functional.
The FETs and transformer will make 4khz square wave and will never have 60hz. and Using inductors and capacitors (not in the schematic) will require huge inductors and capacitors. Low pass filter with a roll off at 70hz.
See H-bridge above.