Patent ID: 9692310
Date: 2017-06-27
CPC Classifications: H02J,H02M,Y02B

Claim:
1. A power converter that outputs AC voltage on the basis of an AC output voltage command, comprising: a single-phase AC power source having a first AC terminal and a second AC terminal; a DC power source series circuit comprising a first DC power source and a second DC power source connected in series such that a neutral terminal is connected to the second AC terminal, the neutral terminal being a connection point of the first DC power source and the second DC power source; a switching element series circuit comprising a positive-side switching element connected to a positive-side terminal of the DC power source series circuit, and a negative-side switching element connected to a negative-side terminal of the DC power source series circuit; a first AC output terminal connected to a connection point of the positive-side switching element and the negative-side switching element; a second AC output terminal connected to the neutral terminal; and a bidirectional switch element, a first end of the bidirectional switch element being connected to the first AC output terminal and a second end of the bidirectional switch element being connected to the first AC terminal, wherein at each control period resulting from dividing one period of the AC output voltage command into a plurality of control periods each having a time width, the power converter is configured to set, as a first voltage, a voltage of one level selected from among three levels of voltage of a positive-side voltage of the DC power source series circuit, a negative-side voltage of the DC power source series circuit, and a voltage of the AC power source, to set, as a second voltage, the voltage of another level selected from among the three levels of voltage, and to output the first voltage and the second voltage to the first AC output terminal, over respective time widths.