公开(公告)号：US09765468B2

公开(公告)日：2017-09-19

申请号：US14536004

申请日：2014-11-07

Applicant: LG ELECTRONICS INC. ,  SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

Inventor： Kyunghoon Kim ,  Jayeong Yu ,  Seungjun Chee ,  Seungki Sul ,  Minho Jang

IPC: D06F37/30 ,  D06F33/02 ,  H02P6/182 ,  H02P6/20

CPC classification number: D06F37/304 ,  D06F33/02 ,  D06F2202/12 ,  D06F2204/06 ,  H02P6/182 ,  H02P6/20 ,  Y02B40/52

Abstract: The laundry treatment machine, absent a position sensor to sense the rotor position of a motor, includes a driving unit having an DC/AC inverter, an voltage detection unit to detect output voltage, and an inverter controller to control the inverter. The output voltage detection unit includes a plurality of resistors connected between the inverter and the motor and a comparator to compare voltage detected by some of the resistors with reference voltage and to detect pulse width modulation (PWM)-based output voltage. The voltage detection unit outputs the PWM-based output voltage output from the comparator to the inverter controller in a first mode in which at least one switching device of the inverter is turned on. The voltage detection unit outputs voltage detected by other some of the resistors to the inverter controller in a second mode in which all switching devices of the inverter are turned off.