| 摘要 |
<p>In relation to a multilevel inverter of three levels or more, a decrease in safety due to breakdown is suppressed while avoiding destruction of switching elements. An inverter includes switching elements connected in series between a positive terminal and a negative terminal, reverse blocking switching elements connected one each between connection points of pairs of the switching elements and an intermediate terminal, alternating current output terminals, a control unit that generates control signals for switching between a turning on and turning off of the plurality of switching elements, a control signal interrupt circuit that, on an interrupt signal interrupting the output voltage of the alternating current output terminals being input, interrupts each of the control signals to the first switching elements and second switching elements, regardless of the state of the control signals, and a monitoring unit that diagnoses a breakdown of the control signal interrupt circuit.</p> |
