Patent ID: 9608541
Date: 2017-03-28
CPC Classifications: H02M

Claim:
1. A DC-to-AC conversion apparatus configured to convert a DC input power source into a three-phase AC output power source, the DC-to-AC conversion apparatus comprising: an input capacitor assembly connected to the DC input power source and having a neutral point; wherein the neutral point is directly connected to a first phase sequence of the three-phase AC output power source to provide a first path; a first conversion circuit having a first bridge arm and a second bridge arm; wherein the first bridge arm has a first upper bridge switch unit and a first lower bridge switch unit connected in series to the first upper bridge switch unit at a first connection point; the second bridge arm has a second upper bridge switch unit and a second lower bridge switch unit connected in series to the second upper bridge switch unit at a second connection point; wherein the first connection point is connected to a second phase sequence of the three-phase AC output power source to provide a second path and the second connection point is connected to a third phase sequence of the three-phase AC output power source to provide a third path; a second conversion circuit having a third bridge arm and a fourth bridge arm; wherein the third bridge arm has a third upper bridge switch unit and a third lower bridge switch unit connected in series to the third upper bridge switch unit to form a first in-series path with a first terminal and a second terminal, and the first terminal is connected to the second path; the fourth bridge arm has a fourth upper bridge switch unit and a fourth lower bridge switch unit connected in series to the fourth upper bridge switch unit to form a second in-series path with a first terminal and a second terminal, and the first terminal is connected to the third path; wherein the second terminal of the first in-series path is connected to the second terminal of the second in-series path and directly connected to the first phase sequence; and a control circuit configured to generate a plurality of control signals to control the first conversion circuit and the second conversion circuit so as to convert the DC input power source into the three-phase AC output power source.