Patent ID: 8581531
Filing Date: 2013-11-12
Classification: H02P

Abstract:
1. An electric power converting apparatus, comprising: a switching circuit, which is configured to invert DC to AC; a PWM controller, which is configured to control ON or OFF of the switching circuit, thereby conducting PWM all phase shut-off and zero-vector outputting; a unit, which is configured to detect or estimate current flowing through a motor; a unit, which is configured to conduct a DC braking; and a current comparator, which is configured to compare between a DC braking time maximum current setup value, which is determined from outside or is determined from inside in advance, and a current value, which is obtained by the unit configured to detect or estimate current, wherein the PWM all phase shut-off and zero-vector outputting are conducted, repetitively, by the PWM controller, if the current comparator determines that a current value, which is obtained by the unit configured to detect or estimate current, exceeds the DC braking time maximum current setup value, when conducting the DC braking to obtain a braking power by running current through the motor.