Patent ID: 8362722

Claim:
A power converter device, comprising: a switching circuit, which is configured to convert DC to AC; a PWM controller means, which is configured to control ON or OFF of said switching circuit; a means, which is configured to detect or estimate current flowing through a permanent magnet synchronous motor; and a means, which is configured to execute DC braking of said permanent magnet synchronous motor, wherein there are provided a DC braking maximum current setup value, which is determined from an outside or is determined in advance within an inside, and a PWM all-phases cutoff function and a zero vector output function within said PWM controller means, within said PWM controller means, whereby the PWM all-phases cutoff and the zero vector output are repeated within said PWM controller means, if a current value, which is obtained by said means for detecting or estimating the current, exceeds said DC braking maximum current setup value, when running DC current to the permanent magnet synchronous motor, so as to execute DC braking for obtaining a braking power.