Power conversion device

摘要

Four bus bars, which are two positive-electrode-side bus bars connecting a positive electrode of a capacitor series circuit and a positive electrode of a power conversion section, a negative-electrode-side bus bar connecting a negative electrode of the capacitor series circuit and a negative electrode of the power conversion section, and an intermediate connection bus bar connecting in series two smoothing capacitors in the capacitor series circuit, are stacked in close contact with one another via insulating layers, to form a 4-layer bus bar. The two positive-electrode-side bus bars are not adjacent to each other and are connected in parallel to each other. The positive-electrode-side bus bar which is one of them and the negative-electrode-side bus bar are disposed adjacent to each other, thereby to reduce DC wiring inductances of the wiring structure in which the capacitor series circuit and the power conversion section are connected.

主权项

1. A power conversion device comprising:
a capacitor series circuit composed of a first smoothing capacitor and a second smoothing capacitor connected in series to each other; and a power conversion section including a plurality of semiconductor switching elements and for performing power conversion between DC power of the capacitor series circuit and AC power, the power conversion device further comprising:
a first connection line connecting a positive electrode of the capacitor series circuit and a positive electrode of the power conversion section;a second connection line connecting a negative electrode of the capacitor series circuit and a negative electrode of the power conversion section; anda third connection line connecting in series the first smoothing capacitor and the second smoothing capacitor, wherein one of the first and second connection lines is composed of two bus bars that are not adjacent to each other and that are connected in parallel to each other, the other of the first and second connection lines is composed of one bus bar disposed so as to be adjacent to one of the two bus bars connected in parallel to each other, the third connection line is composed of one bus bar, and the four bus bars in total are stacked in close contact with one another via insulating layers to form a stacked bus bar.