INVERTER WITH A DIRECT ALTERNATING CURRENT BRIDGE AND AN IMPROVED TOPOLOGY FOR CONVERTING DIRECT CURRENT INTO ALTERNATING CURRENT

摘要

FIELD: conversion of electric power.;SUBSTANCE: present invention relates to a power converter of direct current into alternating current, provided with a main direct current input (1) and a main single-phase alternating current output (4) containing a single direct current converter (5), and, first, in accordance with a straight line, a bidirectional converter (6) of direct current into alternating current by voltage in a cascade with the direct current converter (5), wherein said bidirectional converter (6) of direct current into alternating current by voltage has a direct current input-output (11) connected to the direct current output (10), and an alternating current output-input (12) connected to the main alternating current output (4), and, second, in accordance with a by-pass line and parallel to said bidirectional converter (6) of direct current into alternating current by voltage and the specified low frequency diodes (2), a low frequency full switching H-bridge (7) by voltage, hereinafter referred to as the direct alternating current bridge with a direct current input and an alternating current output, wherein said direct current input is connected to said direct current output (10) of said single direct current converter (5) and the alternating current output is connected in parallel to said main alternating current output (4), wherein said direct alternating current bridge has a frequency less than 1 kHz, so that when the instantaneous voltage between the terminals of said main alternating current output (4) reaches the preset level, the low-frequency direct alternating current bridge (7) switches to activation, and the low-frequency diodes (2) have a back bias and do not conduct current, and said direct current converter (5) supplies constant power directly to the load.;EFFECT: improved conversion of alternating current into direct current by means of an inverter.;12 cl, 7 dwg