PWM - pulse width modulation
We cant see it with our eyes... A voltmeter shows a lower or higher output voltage to the load and we just know its a dimmer switch. Hey its more than that.
Its a duty cycle control, maintaining the source power constantly but changing the switching speeds and this is what drives inverters. Too fast for us to see... but not for the oscilloscope.
Imagine switching both positive and negative feeds to create a sine wave , then chop the same feeds twice more at differing time intervals and you have 3 phase inverter output from one single phase DC supply.
Folks ... don't beat your brains out. it is just that simple to do. You see here you are looking at one positive signal switching which we call DC. No negative signal other than 0V. But give it a negative switch and it looks like a raw AC waveform. This is the basis of phase creation from +/- DC
You see an inverter gets to do both at the same time... And the world just got smaller for all of you , nothing is over complicated. Its just ON - OFF high signal, low signal positive on and negative on.
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