1 kW Dual stage DC-AC converter

The analysis, design and performance characterization of a 1 kW dual stage DC-AC photovoltaic (PV) standalone systems, are presented in this application note.
The converter is fed by a low DC input voltage varying from 20 V to 28 V and is capable of supplying up to 1 kW output power on a single-phase AC load.

These features are possible thanks to a dual stage conversion topology including an efficient step-up push-pull DC-DC converter, to produce a regulated high-voltage DC bus and a sinusoidal H-Bridge PWM inverter to generate a 50 Hz, 230 Vrms output sine wave.
Other relevant features of the proposed system are high power density, high switching frequency, galvanic isolation and efficiency greater than 90% over a wide output load range.