Patent Number: 8,712,618

Title: Power conversion device for electric vehicle

Abstract: To include a power converter that drives an induction machine and a control unit that controls the, power converter. The control unit includes a drive stopping unit. The drive stopping unit includes a secondary-resistance-temperature detecting unit that detects temperature rise of a secondary resistance of the induction machine based on a current (a d-axis-current detection value and a q-axis-current detection value, or a d-axis current command and a q-axis current command) detected by the induction machine, an inverter angular frequency calculated based on the current, and speed information of an electric vehicle detected by an external-speed-information detecting unit, and the drive stopping unit also includes a drive-stopping-signal output unit that outputs a drive stopping signal for stopping a driving operation of the power converter based on the speed information .omega.train of an electric vehicle and an output (deviation) from the secondary-resistance-temperature detecting unit.

Inventors: Kono; Masaki (Chiyoda-ku, JP), Okayama; Hideo (Chiyoda-ku, JP)

Assignee: Mitsubishi Electric Corporation

International Classification: B60L 9/00 (20060101)

Expiration Date: 4/29/12018