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controller in converter, inverter

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htetphoe

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I'm trying to build a inverter. containing converter (12 to 400, full bridge, 20kHz) and inverter (full bridge, fs=20kHz, 50 Hz, 230 Vout).

I find many difficulties for building control section.

1. how can i model and calculate the frequency domain gain of converter, inverter?

2. how can i adjust the duty cycle while eliminating the effect of load current to output voltage?

i would like to build with analog controller such as op-amp.

Thanks
 

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