AN2794 Datasheet, PDF (1/39 Pages) STMicroelectronics – This application note provides design guidelines

AN2794
Application note
1 kW dual stage DC-AC converter based on the STP160N75F3
Introduction
This application note provides design guidelines and performance characterization of the
STEVAL-ISV001V1 demonstration board.
This board implements a 1 kW dual stage DC-AC converter, suitable for use in battery-
powered uninterruptible power supplies (UPS) or photovoltaic (PV) standalone systems.
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 of output power on a single-phase AC load. These features are
possible thanks to a dual stage conversion topology that includes an efficient step-up push-
pull DC-DC converter, which produces a regulated high-voltage DC bus and a sinusoidal H-
Bridge PWM inverter to generate a 50 Hz, 230 Vrms output sine wave. Other key features of
the system proposed are high power density, high switching frequency and efficiency
greater than 90% over a wide output load range
Figure 1. 1 kW DC-AC converter prototype
January 2012
Doc ID 14827 Rev 2
1/39
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