| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique for reducing the price of an inverter while suppressing a reduction in its conversion efficiency.SOLUTION: An inverter 220 converts DC power from DC power sources V1, V2 into AC power formed with a pseudo-sine wave and outputs the converted powder. A first absolute value setting switch Q0 to a fourth absolute value setting switch Q6 are switched in order to generate an absolute value of AC power by using a combination of a power source voltage from each DC power source and a voltage generated from the voltage of each DC power source. A first polarity setting switch R1 to a fourth polarity setting switch R4 are switched in order to generate the polarity of the AC power. A control unit 20 controls switching of the first absolute value setting switch Q0, etc., and the first polarity setting switch R1, etc., in order to generate a gradation voltage of the pseudo-sine wave to be outputted. The control unit 20 switches the first polarity setting switch R1, etc., synchronously with a time at which the polarity of the pseudo-sine wave changes. |
