Title:
WASHING MACHINE
Document Type and Number:
WIPO Patent Application WO/2022/100072
Kind Code:
A1
Abstract:
A washing machine, comprising: a safety circuit that allows, when the number of revolutions of a drum is lower than a preset specified threshold, a driving circuit, used for controlling a door locking device, to work, and prohibits, when the number of revolutions of the drum exceeds a specified number of revolutions, the driving circuit from working on the basis of an operation signal from a control portion. The safety circuit comprises: a pulse detection portion for detecting an edge of a rotation pulse from a rotation sensor disposed on the drum; and a revolution determination portion for determining the number of revolutions of the drum on the basis of the rotation pulse detected by the pulse detection portion. The washing machine uses an integration circuit and an integration hysteresis element to form the revolution determination portion; the integration circuit integrates the turn-on time and turn-on time of the rotation pulse; and the integration hysteresis element outputs a high level when an output of the integration circuit exceeds a specified first integration threshold, and outputs a low level when the output of the integration circuit is lower than a specified second integration threshold that is less than the first integration threshold. In addition to preventing the poor condition and misoperation of a program and the control portion, the washing machine can also prevent a door locking state from being released due to external noise.
Inventors:
KAWABE YOSHIHISA (JP)
Application Number:
PCT/CN2021/097902
Publication Date:
May 19, 2022
Filing Date:
June 02, 2021
Export Citation:
Assignee:
QINGDAO HAIER WASHING MACH CO (CN)
AQUA CO LTD (JP)
HAIER SMART HOME CO LTD (CN)
AQUA CO LTD (JP)
HAIER SMART HOME CO LTD (CN)
International Classes:
D06F37/42
Domestic Patent References:
| WO2020049603A1 | 2020-03-12 |
Foreign References:
| CN1566493A | 2005-01-19 | |||
| CN203130261U | 2013-08-14 | |||
| CN101394165A | 2009-03-25 | |||
| CN102433716A | 2012-05-02 | |||
| CN111088650A | 2020-05-01 | |||
| CN204780313U | 2015-11-18 | |||
| CN1627090A | 2005-06-15 |
Attorney, Agent or Firm:
BEYOND ATTORNEYS AT LAW (CN)
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