In the first structure, the boost stage is followed by an isolated full bridge converter. The function of the full bridge transformer is to provide isolation. The second full bridge converter on the output is used to convert the DC voltage of the first stage full bridge converter to AC voltage. Its output is filtered before it is connected to the AC power grid through an additional double contact relay switch, so as to provide safety isolation in fault events and isolation from the power grid at night.

The second structure is non isolation scheme. Among them, the AC voltage is directly generated by the DC voltage output from the step-up stage.

The third structure uses the innovative topology of power switch and power diode to integrate the functions of boost and AC generation into a dedicated topology.

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