US 12,006,615 B2
Washing machine and control method thereof
Kosaku Adachi, Yokohama (JP); and Hiroyuki Miyake, Yokohama (JP)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Jun. 7, 2021, as Appl. No. 17/340,577.
Claims priority of application No. 2020-102854 (JP), filed on Jun. 15, 2020; and application No. 10-2021-0048537 (KR), filed on Apr. 14, 2021.
Prior Publication US 2021/0388552 A1, Dec. 16, 2021
Int. Cl. H02P 27/08 (2006.01); D06F 34/04 (2020.01); D06F 34/06 (2020.01); D06F 34/08 (2020.01)
CPC D06F 34/08 (2020.02) [D06F 34/04 (2020.02); D06F 34/06 (2020.02); H02P 27/085 (2013.01); H02P 2209/13 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A washing machine comprising:
an inner tub;
a motor connected to the inner tub through a rotating shaft;
an inverter circuit operatively connected to the motor and comprising three pairs of bridged switching elements; and
at least one processor configured to provide a modulation signal to the inverter circuit to turn on or off the three pairs of bridged switching elements so as to convert DC power into AC power,
wherein the at least one processor is configured to:
provide the modulation signal to two pairs of switching elements among the three pairs of bridged switching elements for a first time period in a first mode,
provide the modulation signal to the three pairs of bridged switching elements for a second time period in a second mode, and
alternately perform the first mode and the second mode,
wherein the at least one processor is further configured to: provide a first carrier signal for a first pulse width modulation in the first mode, provide a second carrier signal for a second pulse width modulation in the second mode, and
wherein a frequency of the second carrier signal is a frequency between 0.4 times and 0.6 times a frequency of the first carrier signal and is a frequency to maintain a shape of a first order harmonic wave due to a two-phase modulation in a FFT analysis.