Mitsubishi Electric Corporation

Toshiyuki Yasutomi

Shozo Kanzaki

Yasuhiko Kitamura

Hiroaki Takahashi

Ryuichi Ishii

Provided is a power conversion unit, in which a power smoothing capacitor is configured such that a plurality of unit capacitors as conductive polymer hybrid aluminum electrolytic capacitors are arrayed in a grid pattern and connected in parallel on a circuit board, and also connected to a plurality of unit modules of different phases via positive and negative bus bars arranged on both sides of the circuit board so that each group of several unit capacitors and each unit module are arranged close to each other, to thereby reduce wiring impedance of a power supply circuit and suppress noise generation.

Power conversion unit

To downsize a power smoothing capacitor substrate unit for opening/closing modules configured to convert a low-voltage DC power to AC power to drive a three-phase AC motor. A plurality of unit capacitors () being a conductive polymer aluminum electrolytic capacitor are connected between a positive-side first conductive plate (P) connected to a positive-side power supply terminal (P) and a negative-side second conductive plate (N) connected to a negative-side power supply terminal (N), and three or more capacitor rows are arranged for each of three pairs of divided power supply terminal blocks (B) connected to the opening/closing modules (B) and one or more capacitor rows are arranged between the terminal blocks. Accordingly, ripple currents in a large number of capacitors connected in parallel to each other are equalized to prevent a temperature increase in each capacitor.

Growing community of inventors

Tokyo, Japan

Toshiyuki Yasutomi