DIRECT CURRENT VOLTAGE TO ALTERNATING CURRENT VOLTAGE CONVERTER Russian patent published in 2024 - IPC H02M7/539 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and is intended for converting DC voltage into AC voltage. Converter includes a high-frequency inverter with pulse-width modulation of the output voltage and a reversible rectifier made on two transistors, having a control system which forms the output voltage of the converter from sections of high-frequency voltage curves. Converter comprises power circuit of high-frequency inverter (1), containing input capacitor (6) connected to DC voltage source UBX, high-frequency transistors of high-frequency inverter (7 and 8) and inverse diodes of high-frequency inverter circuit (9 and 10), transformer (2), power circuit of reversible rectifier (3), containing reversing rectifier transistors (11 and 12), reverse diodes of reversing rectifier circuit (13 and 14), inductance coil of passive L-shaped LC-filter (15) and capacitor of passive L-shaped LC-filter (16). Drawing shows outputs for connection of DC voltage source U_IN and outputs for connection of AC load U_OUT. Reverse diodes (9 and 10) of the high-frequency inverter circuit, (13 and 14) of the reversing rectifier circuit are intended for protection of transistors against overvoltage during switching. High-frequency inverter (4) control system comprises sawtooth voltage generator (17), pulse former (18), rectifier (19), adder (20), voltage deviation meter (21), high-frequency sinusoidal voltage polarity sensor (22), first and second AND logic elements (23 and 24), first and second pulse amplifiers (25 and 26), driving generator of high-frequency sinusoidal voltage (27). Reversible rectifier (5) control system, synchronization unit (28), driving generator of low-frequency sinusoidal voltage (29), first and second comparators (30 and 31), low-frequency sinusoidal voltage polarity sensor (32), third and fourth AND logic elements (33 and 34), third and fourth pulse amplifiers (35 and 36).

EFFECT: higher reliability and efficiency of the converter.

1 cl, 3 dwg