TECHNICAL FIELD

The present invention relates to a power converter, and more particularly to a power converter for a hybrid vehicle or an electric vehicle.

BACKGROUND ART

In the main circuit and capacitor module of an inverter mounted on a hybrid vehicle or electric vehicle, a configuration is adopted, in which a power semiconductor circuit unit that performs an operation of converting DC power into AC power is connected by a bus bar to which a capacitor that smooths DC power is connected.

PTL 1 describes that: a bus bar connected to a power semiconductor circuit unit that performs an operation of converting DC power to AC power needs to be electrically connected also to a smoothing capacitor; and the bus bar is extended to the electrode surface of a capacitor element to be connected to the electrode surface.

However, the bus bar is a heat-generating component, while the capacitor element needs to be provided with heat measures, such as heat dissipation and heat shielding, against the exothermic temperature of the bus bar.

CITATION LIST

Patent Literature

PTL 1: JP 2011-233795 A

SUMMARY OF INVENTION

Technical Problem

An object of the present invention is to ensure the reliability of a capacitor element by appropriately securing a heat path around the capacitor element.

Solution to Problem

A power converter according to the present invention includes: a power semiconductor circuit unit that converts DC power into AC power; a capacitor element that smooths the DC power; a DC-side bus bar that transmits the DC power; a capacitor terminal that is connected to an electrode surface of the capacitor element and to the DC-side bus bar; and a case that forms a capacitor housing portion for housing the capacitor element, in which the DC-side bus bar has: a power supply-side terminal; a main body portion that is arranged at a position facing a bottom of the capacitor housing portion with the capacitor element interposed therebetween; and an extending member that is formed between the case and the capacitor element and formed from the main body portion toward the bottom of the capacitor housing portion, and that does not contact the electrode surface.

Advantageous Effects of Invention

According to the present invention, the reliability of the capacitor element can be improved.

