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Please post a nice 500 watt sine wave inverter schematics with PCB layout, component layout and source codes if any in your collection which you have tested and worked. I'll try it out and i'll ask you the doubts. In this way you will be more comfortable answering for my questions and i'll be confidently assembling it up, as you have already done it. Regards.
I simulate this circuit its sine wave.Dear M.Rehman,
Yes I mean to say the output of osc1 and osc2 which is meant to feed the switching circuit.May be that feeding to the low/high side of driver of switching cct or to the bases of transistors(also called B1&B2) feeding to the switching cct.the diagram you provided is a UPS cct.diagram,when the charging starts the output of oscillator goes in a sleeping mode(shut down),The output of osc1 and osc2 only starts when the grid supply goes off.
The osc1 and osc2 outputs a square wave while you claimed in your given gift a sine wave.I think you didn't prove this circuit practically and sent it in forum without varification.However I made it after wasting a lot of time and money and found it square wave inverter instead of sine wave inverter.Please take care in future regarding not to send any cct. without varification.
Can you please explain the charging mechanism?
This is what I think:
In mains mode, the two high side MOSFETs are off. While low voltage AC is coming at the output of the transformer to which bridge is connected, both low side MOSFETs are turned on and off simultaneously. The pulse width determines the charging current. Thus the bridge then acts as a boost converter circuit, with the body diodes of the upper MOSFETs used as the diodes for the boost converter and low side MOSFETs pulsating at 4-8kHz.
Am I right?