Inverter that converts DC power into AC power

摘要

An inverter converts a direct-current (DC) power supplied from different DC power supplies into an alternate-current (AC) power formed by a quasi sinusoidal wave and then outputs the thus converted AC power. A first absolute-value setting switch to a fourth absolute-value setting switch are switched to generate absolute values of AC power by using a combination of a power-supply voltage supplied from each DC power supply and a voltage generated from a voltage supplied from each DC power supply. A first polarity setting switch to a fourth polarity setting switch are switched to generate the polarities of AC power. A control unit controls the switching of the first absolute-value setting switch and the like and the first polarity setting switch and the like. The control unit switches the first polarity switching switch and the like with timing at which the polarity of quasi sinusoidal wave changes.

主权项

1. An inverter for applying a quasi-sinusoidal wave as a voltage output to a load, comprising:
a first switch, a second switch, a third switch, and a fourth switch; a first polarity setting switch, a second polarity setting switch, a third polarity setting switch, and a fourth polarity switching switch; and a control unit, wherein a first terminal of the first switch is connected to a first power supply, a second terminal of the first switch is connected to a first terminal of the first polarity setting switch and a first terminal of the second polarity setting switch, a second terminal of the first polarity setting switch is connected to a second terminal of the fourth polarity setting switch, a second terminal of the second polarity setting switch is connected to a second terminal of the third polarity setting switch, a first terminal of the second switch is connected to a first terminal of the third polarity setting switch and a first terminal of the fourth polarity setting switch, a second terminal of the second switch is connected to ground, a first terminal of the third switch and a first terminal of the fourth switch are connected to a second power supply, a second terminal of the third switch is connected to the first terminal of the first polarity setting switch and the first terminal of the second polarity setting switch, a second terminal of the fourth switch is connected to the first terminal of the third polarity setting switch and the first terminal of the fourth polarity setting switch, a first terminal of a load is connected to a path that connects the second terminal of the first polarity setting switch and the second terminal of the fourth polarity setting switch, a second terminal of the load is connected to a path that connects the second terminal of the second polarity setting switch and the second terminal of the third polarity setting switch, and the control unit is configured to generate a quasi-sinusoidal wave having a first voltage E1 from the first power supply, a second voltage E2 from the second power supply, and a voltage difference (E1−E2) between the first voltage E1 and the second voltage E2, by controlling the first switch, the second switch, the third switch, the fourth switch, the first polarity setting switch, the second polarity switching switch, the third polarity setting switch, and the fourth polarity setting switch, and applying the generated quasi-sinusoidal wave to the load.