INVERTER WITH AC FORWARD BRIDGE AND IMPROVED DC/DC TOPOLOGY

摘要

The present invention relates to a DC-to-AC power converter having a main DC input (1) and a main single-phase AC output (4) comprising a single DC-to-DC converter (5) and, firstly, according to a direct path, a bidirectional voltage-type DC-to-AC converter (6) in series with the DC-to-DC converter (5), said bidirectional voltage-type DC-to-AC converter (6) having a DC input-output (11) connected in parallel to the DC output (10) and an AC output-input (12) connected in parallel to said main AC output (4) and, secondly, according to a bypass path, a current-type low frequency full switching H-bridge (7), called hereafter AC forward bridge, having a DC input and a AC output, said DC input being connected in parallel to said DC output (10) of the single DC-to-DC converter (5) and said AC output being connected in parallel to said main AC output (4), so that, when the instantaneous voltage between the terminals of said main AC output (4) attains a predetermined level, the low frequency forward AC bridge (7) is switched on, the low frequency diodes (2) being reverse biased and non-conducting and a constant power is supplied by the DC-to-DC converter (5) directly to the load.