1kW DC-AC Inverter

Once I needed this device for a particular experiment, but I actually built it from sheer curiosity. I also used it as an official project for Electrical Engineering course during my studies at the University of Belgrade. It is still being used a power amplifier or a controllable voltage source during tests and experiments.



 - High efficiency switch-mode power amplifier
 - Utilizes IGBT transistors in "H" bridge topology
 - Powered by a 380 VDC bus, compatible with 240 VAC rated PFC devices
 - Current limited output with 200% surge handling capability
 - Employs a high quality output filter to suppress 50kHz switching frequency
 - Optimized filter characteristics to provide good transient response



 - Supply Voltage: 300 - 400 VDC (380 VDC Nominal)
 - Output Voltage: ±360 V, 250 Vrms for sine wave output (With nominal supply voltage)
 - Output Current: up to ±6.5 A constant, up to ±13 A during surge
 - Allowed surge duration: from 2 to 10 sec, depending on the value of the current
 - Output Power at 220 Vrms: 1 kVA, 2 kVA surge capability
 - Switching Frequency: 50 kHz
 - Switching Frequency Suppression: >50 dB
 - Filter Resonant Frequency: 2.1 kHz
 - Output Frequency Response: DC - 200 Hz
 - Efficiency: up to 95 %