TECHNICAL FIELD

Embodiments of the present invention relates to a power converter.

BACKGROUND ART

As one of power converters, a neutral point clamped type power converter is known. The neutral point clamped type power converter includes, for example, four switching elements electrically connected in series with each other, four freewheeling diodes connected in inverse parallel with respect to the four switching elements, and two clamp diodes.

By the way, the power converter is expected to have a large capacity. However, in a case where the capacity of the power converter is increased, a surge voltage at the time of switching may increase due to an increase in the energizing current or an increase in the wiring inductance.

CITATION LIST

Patent Literature

[Patent Literature 1]

Japanese Unexamined Patent Application, First Publication No. 2016-158450

SUMMARY OF INVENTION

Technical Problem

An object of the present invention is to provide a power converter which is able to reduce a surge voltage.

Solution to Problem

A power converter according to an embodiment is a neutral point clamped type power converter, and includes first to fourth switching modules, a first clamp diode, a second clamp diode, a first bus, and a second bus. The first to fourth switching modules are electrically connected in series with each other in the order of the first switching module, the second switching module, the third switching module, and the fourth switching module from a positive electrode to a negative electrode. Each of the first switching module, the second switching module, the third switching module, and the fourth switching module includes a switching element, a package containing the switching element, a first terminal, and a second terminal, the first terminal being electrically connected to a collector of the switching element and exposed to an outside of the package, the second terminal being electrically connected to an emitter of the switching element and exposed to the outside of the package. The package of the second switching module and the package of the third switching module is arranged side by side. An anode of the first clamp diode is connected to a neutral point of the power converter. A cathode of the second clamp diode is connected to the neutral point of the power converter. The first bus includes a first main portion and a first standing portion. The first main portion electrically connects the second terminal of the first switching module and the first terminal of the second switching module, and is connected to a cathode of the first clamp diode. The first standing portion is provided in an end of the first main portion, and stands up with respect to the first main portion. The second bus includes a second main portion and a second standing portion. The second main portion electrically connects the second terminal of the third switching module and the first terminal of the fourth switching module, and is electrically connected to an anode of the second clamp diode. The second standing portion is provided in an end of the second main portion, stands up with respect to the second main portion, and faces the first standing portion of the first bus.

