Patent ID: 7466086
Filing Date: 2008-12-16
Classification: H02P

Abstract:
1. A motor drive unit for use with a DC power source, the motor drive unit comprising: a plurality of inverter circuits configured to convert DC power of the DC power source to AC power; a current detector configured to detect an output current of at least one of the plurality of inverter circuits, the current detector including a plurality of shunt transistors connected respectively to the emitter terminals of a lower arm transistor of the at least one inverter circuit, and a level shift circuit connected to the plurality of shunt resistors, the level shift circuit configured to shift current signals of the plurality of shunt resistors or perform an amplification after level shifting of the plurality of shunt resistors; and a controller configured to perform PWM control of the plurality of inverter circuits, to synchronize a PWM period of the plurality of inverter circuits, and to drive a plurality of motors respectively at once by means of the plurality of inverter circuits.