CN116169643A

CN116169643A - Washing machine

Info

Publication number: CN116169643A
Application number: CN202211424970.5A
Authority: CN
Inventors: 崔增良
Original assignee: Hisense Refrigerator Co Ltd
Current assignee: Hisense Refrigerator Co Ltd
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2023-05-26

Abstract

The application provides a washing machine, which comprises a shell, an outer barrel, a roller, a motor, an output circuit and a timer; the outer cylinder is arranged in the shell; the roller is rotatably arranged in the outer cylinder; the motor is connected with the roller and is used for driving the roller to rotate, and the motor is provided with a first phase circuit, a second phase circuit and a third phase circuit of three-phase voltage; the output circuit is electrically connected with the motor; the output circuit comprises a first optical coupler circuit connected with the first phase circuit and the second phase circuit and outputting a first detection signal, and a second optical coupler circuit connected with the second phase circuit and the third phase circuit and outputting a second detection signal; the timer is connected to the output ends of the first optical coupler circuit and the second optical coupler circuit, when the voltage value of the first detection signal or the voltage value of the second detection signal is a first preset value, the motor is in open phase, the motor stops running, the timer continues to judge, and when the voltage value of the first detection signal and the voltage value of the second detection signal are a second preset value, the motor normally runs.

Description

Washing machine

Technical Field

The application relates to the technical field of household appliances, in particular to a washing machine.

Background

The open-phase detection of the brushless DC motor of the current washing machine has two detection modes: one is that a software algorithm detects that the current of a certain phase or phases is less than a certain fixed value in a fixed time to evaluate whether the phase is open; the other mode is to adopt a hardware circuit to detect the current from a certain phase to the power ground in a fixed time so as to judge whether the phase is lost, when the three-phase rectifying circuit is utilized to carry out two-phase rectification in the prior art, the characteristics of zero crossing of output voltage are utilized, and a logic judging circuit is arranged to enable a processor to detect whether the three-phase alternating current has a phase failure or not in real time, but because some direct current BLDC motors are in idle load, the current is very small, a software algorithm needs to judge for a long time, so that the possibility of judging whether the phase failure is not out is possible, meanwhile, the direct current motor designs of different manufacturers are different, and particularly when the empty motor is in operation, the basically detected motor three-phase current is very small, the software algorithm is more complicated, the monitoring is inaccurate, and the phase failure is misjudged.

Disclosure of Invention

The present invention solves at least one of the technical problems in the related art to a certain extent.

Therefore, the application aims to provide a washing machine, a hardware circuit is adopted and is matched with software to sample zero-crossing signals, whether the motor is in a phase failure is detected in a direct judging mode, through the fact that a first optocoupler connected to a first phase circuit and a second optocoupler connected to a second phase circuit and a third phase circuit are arranged in the hardware circuit, when the voltage of one phase is higher than the voltage of the other phase, the first optocoupler and/or the second optocoupler conduct to emit light, detecting signals of a first output end of the first optocoupler and/or a second output end of the second optocoupler are detected, two preset values are set, when the voltage value of the first output end or the second output end is equal to the first preset value, the motor is judged to be in a phase failure, a control module controls the motor to stop running, a fault is reported, a timer continues to detect, when the voltage value of the first output end or the second output end is detected to be equal to the second preset value, the motor is judged to resume normal running, and the motor continues normal running. The weighing value is reflected by the power change value, which is the result obtained by the change of the current value and the voltage value, and the accuracy of the result obtained by the detection mode is improved, which is obviously higher than that estimated by only using the current change and the speed change.

A washing machine according to the present application, comprising: the device comprises a shell, an outer barrel, a roller, a motor, an output circuit and a timer; a storage space is formed in the shell, and a box opening communicated with the storage space is formed in the shell; the outer cylinder is arranged in the shell, a delivery opening corresponding to the box opening is formed on the outer cylinder, and the outer cylinder is used for receiving washing water; the roller is rotatably arranged in the outer cylinder; the motor is connected with the roller and is used for driving the roller to rotate, and the motor is provided with a first phase circuit, a second phase circuit and a third phase circuit of three-phase voltage; the output circuit is electrically connected with the motor and used for detecting whether the motor lacks phases or not; the output circuit comprises a first optical coupler circuit and a second optical coupler circuit; the first optical coupler circuit is connected with the first phase circuit and the second phase circuit and is used for outputting a first detection signal; the second optical coupler circuit is connected with the second phase circuit and the third phase circuit and is used for outputting a second detection signal; the timer is connected to the output ends of the first optical coupler circuit and the second optical coupler circuit, and is configured to judge whether the motor is out of phase according to whether the voltage value of the first detection signal and/or the second detection signal reaches a first preset value or a second preset value; when the voltage value of the first detection signal or the voltage value of the second detection signal is a first preset value, the motor is in open phase, the motor stops running, the timer continues to judge, and when the voltage value of the first detection signal and the voltage value of the second detection signal are a second preset value, the motor normally runs.

The output circuit comprises a power supply component and an optocoupler connected with the motor, wherein the first input end of the first optocoupler is connected with a first phase circuit of the power supply component, the second input end of the first optocoupler is connected with a second phase circuit, the first input end of the second optocoupler is connected with a second phase circuit, the second input end of the second optocoupler is connected with a third phase circuit, the first input end of the timer is connected with the first output end of the first optocoupler and the first output end of the second optocoupler, and the first output end of the timer and the first output end of the second optocoupler are connected. The weighing value is reflected by the power change value, which is the result obtained by the change of the current value and the voltage value, and the accuracy of the result obtained by the detection mode is improved, which is obviously higher than that estimated by only using the current change and the speed change.

In some embodiments of the present application, the first optocoupler circuit comprises a first optocoupler and the second optocoupler circuit comprises a second optocoupler; the first input end of the first optical coupler and the second input end of the first optical coupler are respectively connected with the first phase line and the second phase line, and the first output end of the first optical coupler outputs a first detection signal; the first input end of the second optical coupler and the second input end of the second optical coupler are respectively connected with the second phase line and the second phase line, and the first output end of the second optical coupler outputs a second detection signal.

In some embodiments of the present application, the first preset value is a high level, the second preset value is a low level, and the timer is specifically configured to: when the voltage value of the first detection signal or the second detection signal is a first preset value, judging that the motor is out of phase, stopping the motor, and reporting a fault; and the timer continues to detect, and when the voltage values of the first detection signal and the second detection signal are the second preset value, the motor is judged not to be out of phase, and the motor operates normally.

In some embodiments of the present application, the output circuit includes: the first input end of the first optocoupler is connected with the first phase line through the first sampling resistor, and the second input end of the first optocoupler is connected with the second phase line; and the second sampling resistor is connected with the first sampling resistor and the second phase line.

In some embodiments of the present application, the output circuit includes: the first input end of the second optical coupler is connected with the third sampling resistor, and the second input end of the second optical coupler is connected with the third phase circuit; and the fourth sampling resistor is connected with the third sampling resistor and the third phase line.

In some embodiments of the present application, the output circuit further comprises: the first diode is connected between the first input end of the first optocoupler and the second input end of the first optocoupler; and the second diode is connected between the first input end of the second optocoupler and the second input end of the second optocoupler.

In some embodiments of the present application, the output circuit further comprises: the first pull-up resistor is connected to the first output end of the first optocoupler; the second pull-up resistor is connected to the first output end of the second optocoupler;

the second output end of the first optocoupler and the second output end of the second optocoupler are grounded.

In some embodiments of the present application, the output circuit further comprises: the first output resistor is connected to the first pull-up resistor, and the first optocoupler is connected to the first input end of the timer through the first output resistor; the second output resistor is connected to the second pull-up resistor, and the second optocoupler is connected to the second input end of the timer through the second output resistor.

In some embodiments of the present application, the output circuit further comprises: the first capacitor is connected with the first output resistor and the ground signal; and the second capacitor is connected with the second output resistor and the ground signal.

In some embodiments of the present application, the washing machine includes a control module connected to the timer, the control module being configured to alarm and/or control the start and stop of the motor according to the open-phase condition detected by the timer.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

Fig. 1 is a schematic circuit diagram of an output circuit of a washing machine according to an embodiment of the present application;

fig. 2 is a circuit schematic of a first sampling circuit of a washing machine in accordance with an embodiment of the present application;

FIG. 3 is a circuit schematic of a second sampling circuit of a washing machine in accordance with an embodiment of the present application;

fig. 4 is a circuit schematic of a first optocoupler circuit of a washing machine according to an embodiment of the present application;

fig. 5 is a circuit schematic of a second optocoupler circuit of the washing machine according to an embodiment of the present application;

fig. 6 is a waveform diagram of a first detection signal or a second detection signal in a normal condition of a washing machine according to an embodiment of the present application;

fig. 7 is a flowchart of a timer phase loss determination of a washing machine according to an embodiment of the present application;

in the above figures: a housing 1; an outer cylinder 2; a drum 3; a motor 4; a first phase line 41; a second phase line 42; a third phase line 43; an output circuit 5; a first optocoupler circuit 51; a first optocoupler 51a; a first input 51b of the first optocoupler; a second input 51c of the first optocoupler; a first output 51d of the first optocoupler; a second output 51f of the first optocoupler; a first detection signal 51g; a second optocoupler circuit 52; a second optocoupler 52a; a first input 52b of the second optocoupler; a second input 52c of the second optocoupler; a first output 52d of the second optocoupler; a second output 52f of the second optocoupler; a second detection signal 52g; a first diode 53a; a second diode 53b; a first pull-up resistor 54a; a second pull-up resistor 54b; a first output resistor 55a; a second output resistor 55b; a first capacitor 56a; a second capacitor 56b; a first sampling resistor 57a; a second sampling resistor 57b; a third sampling resistor 57c; a fourth sampling resistor 57d; a timer 6.

Detailed Description

The present invention will be specifically described below by way of exemplary embodiments. It is to be understood that elements, structures, and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.

In the running process of the washing machine, the motor is used as a main excitation source to work continuously, but the motor has the phenomenon of phase failure, and when the motor is in a failure state, the motor is unfavorable for the use of a user, and the phase failure detection of the brushless direct current motor of the current washing machine has two detection modes: one is that a software algorithm detects that the current of a certain phase or phases is less than a certain fixed value in a fixed time to evaluate whether the phase is open; the other mode is to adopt a hardware circuit to detect the current from a certain phase to the power ground in a fixed time so as to judge whether the phase is lost, but because some direct current BLDC motors are very small in current when no load, the software algorithm needs to judge for a long time, so that whether the phase is lost or not can not be judged, meanwhile, the direct current motors of different manufacturers are different in design, particularly when the empty motors are operated, the basically detected three-phase current of the motors is very small, the software algorithm is more complicated, the monitoring is inaccurate, and the phase failure is misjudged.

Therefore, the application provides a washing machine, and the timer of the washing machine can detect the voltage value of the output end of the optocoupler connected to the output circuit of the motor to judge whether the motor is out of phase or not in the working process of the washing machine. Thus, the washing machine can correspondingly adjust according to the phase-lack state of the motor.

Fig. 1 is a schematic circuit diagram of an output circuit of a washing machine according to an embodiment of the present application.

Referring to fig. 1, the present application provides a washing machine, comprising: a shell 1, an outer cylinder 2, a roller 3, a motor 4, an output circuit 5 and a timer 6; a storage space is formed in the shell 1, and a box opening communicated with the storage space is formed in the shell 1; the outer barrel 2 is arranged in the shell 1, a delivery opening corresponding to the box opening is formed on the outer barrel 2, and the outer barrel 2 is used for receiving washing water; the roller 3 is rotatably arranged in the outer cylinder 2; the motor 4 is connected to the drum 3, the motor 4 is used for driving the drum 3 to rotate, and the motor 4 is provided with a first phase line 41, a second phase line 42 and a third phase line 43 of three-phase voltage; the output circuit 5 is electrically connected to the motor 4 and is used for detecting whether the motor 4 is in a phase failure or not; the output circuit 5 includes a first optocoupler circuit 51 and a second optocoupler circuit 52; a first optocoupler circuit 51 connected to the first phase line 41 and the second phase line 42 for outputting a first detection signal 51g; a second optocoupler circuit 52 connected to the second phase line 42 and the third phase line 43 for outputting a second detection signal 52g; the timer 6 is connected to the output ends of the first optocoupler circuit 51 and the second optocoupler circuit 52, and the timer 6 is configured to determine whether the motor 4 is out of phase according to whether the voltage value of the first detection signal 51g and/or the second detection signal 52g reaches a first preset value or a second preset value; when the voltage value of the first detection signal 51g or the voltage value of the second detection signal 52g is the first preset value, the motor 4 is in open phase, the motor 4 stops running, the timer 6 continues to judge, and when the voltage value of the first detection signal 51g and the voltage value of the second detection signal 52g are the second preset value, the motor 4 normally runs.

The casing 1 forms the whole outward appearance of washing machine, and casing 1 includes base and the curb plate of circumference setting on the base, and curb plate and base interconnect form the casing 1 that has the opening, and the opening of casing 1 is the case mouth for put in clothing, casing 1 roughly takes the rectangle setting.

The washing machine comprises a door body, the door body is rotatably arranged on a machine shell 1, the machine shell 1 is connected to a side plate through a hinge assembly and the like, and clothes in the washing machine are taken and put through opening or closing the door body.

The washing machine comprises an outer cylinder 2 and a roller 3, wherein the outer cylinder 2 is arranged in a storage space in the machine shell 1 and is used for containing washing water, the roller 3 is rotatably arranged in the outer cylinder 2 and is used for rotating washing clothes, and a plurality of dewatering holes are formed in the roller 3.

The washing machine includes a motor 4, and the motor 4 is used for driving the drum 3 to rotate, so that the rotating tub 2 and the drum 3 drive laundry and wash water in the drum 3 to rotate.

The motor 4 that this application adopted is brushless direct current motor 4, and motor 4 includes three-phase power, can exist the trouble because of the open phase at washing machine's operation in-process because of motor 4, consequently designs an output circuit 5, and cooperates software sampling zero crossing signal, directly judges whether motor 4 lacks the phase.

The output circuit 5 is for detecting the phase of a three-phase power supply of the motor 4, the three-phase power supply having a U-phase, a V-phase and a W-phase, the motor 4 having a first phase line 41 connected to the U-phase, a second phase line 42 connected to the V-phase and a third phase line 43 connected to the W-phase, the three-phase power supply being transmitted through the first phase line 41, the second phase line 42 and the third phase line 43, respectively, the output circuit 5 being connected to the first phase line 41, the second phase line 42 and the third phase line 43 for detecting the three-phase voltage of the motor 4.

The washing machine further comprises a control module, the control module is connected to the timer 6, the timer 6 transmits the detected result to the control module, the control module is used for alarming and/or controlling the start and stop of the motor 4 according to the phase-lack state of the motor obtained by the detection signal output by the output circuit 5 and detected by the timer 6, when the motor 4 is detected to be in the phase-lack state, the control module controls the motor 4 to stop running and report a fault, and when the motor 4 is detected to be not in the phase-lack state or to be recovered to be normal after the phase-lack state is detected, the control module controls the motor 4 to continue to normally run.

Fig. 2 is a circuit schematic of a first sampling circuit of a washing machine according to an embodiment of the present application, fig. 3 is a circuit schematic of a second sampling circuit of a washing machine according to an embodiment of the present application, fig. 4 is a circuit schematic of a first optocoupler circuit of a washing machine according to an embodiment of the present application, fig. 5 is a circuit schematic of a second optocoupler circuit of a washing machine according to an embodiment of the present application, fig. 6 is a waveform diagram of a first detection signal or a second detection signal in a normal condition of a washing machine according to an embodiment of the present application, and fig. 7 is a flowchart of a timer of a washing machine according to an embodiment of the present application for phase loss determination.

Referring to fig. 2-7, the output circuit 5 includes a first optocoupler circuit 51 having a first optocoupler 51a and a second optocoupler circuit 52 having a second optocoupler 52a.

The first input terminal 51b of the first optocoupler 51a and the second input terminal 52c of the first optocoupler 51a are connected to the first phase line 41 and the second phase line 42, respectively, and the first output terminal 51d of the first optocoupler 51a outputs the first detection signal 51g.

The first input end 52b of the second optocoupler 52a and the second input end 52c of the second optocoupler 52a are connected to the second phase line 42 and the third phase line 43, respectively, and the first output end 52d of the second optocoupler 52a outputs the second detection signal 52g.

Waveforms of the first detection signal 51g and the second detection signal 52g indicate phase states of the U phase, V phase, and W phase of the three-phase power supply.

Fig. 6 shows waveforms of the first detection signal 51g and the second detection signal 52g in a normal phase state in which the first detection signal 51g and the second detection signal 52g are square wave signals having the same period.

The first input terminal and the second input terminal of the timer 6 are connected to the first output terminal 51d of the first optocoupler 51a and the first output terminal 52d of the second optocoupler 52a, respectively.

Setting a first preset value and a second preset value, wherein the first preset value is high level, and the second preset value is low level. In the application, the first preset value is +5V, and the second preset value is 0V.

The timer 6 determines whether the motor 4 is out of phase according to whether the voltage value of the first detection signal 51g output by the first output terminal 51d of the first optocoupler 51a or the voltage value of the second detection signal 52g output by the first output terminal 52d of the second optocoupler 52a is a first preset value or a second preset value.

When the voltage value of the first detection signal 51g or the second detection signal 52g is a first preset value, the motor 4 is judged to be out of phase, and when the motor 4 is out of phase, the control module controls the motor 4 to stop running and report a fault.

After the motor 4 stops running, the timer 6 continues to judge the phase state of the three-phase power supply of the motor 4, and when the voltage values of the first detection signal 51g and the second detection signal 52g are detected to be the second preset value, the timer 6 judges that the phase state of the motor 4 is recovered to be normal, and the control module controls the motor 4 to continue running.

Specifically, firstly, whether the voltage value of the first detection signal 51g or the second detection signal 52g is equal to a first preset value is judged by setting a timer_1mstimer function, if the voltage value of the first detection signal 51g or the second detection signal 52g or both the voltage values of the first detection signal 51g and the second detection signal 52g are equal to the first preset value, the phase loss of the motor 4 is judged, the result is transmitted to a control module, the control module controls the motor 4 to stop running and report a fault, and if the voltage value of the first detection signal 51g or the second detection signal 52g or both the voltage values of the first detection signal 51g and the second detection signal 52g are not equal to the first preset value, the cycle detection judgment is continued; after the motor 4 stops running, the timer 6 continues to judge the voltage values of the first detection signal 51g and the second detection signal 52g, and when the voltage values of the first detection signal 51g and the second detection signal 52g are equal to the second preset value, the phase state of the motor 4 is judged to be recovered to be normal, and the control module controls the motor 4 to run normally.

In the present application, when the voltage value of one of the first detection signal 51g and the second detection signal 52g is a first preset value, the motor 4 can be determined to be in a phase-failure state, and when the voltage values of both the first detection signal 51g and the second detection signal 52g are second preset values, the motor 4 is determined to be in a non-phase-failure state.

Specifically, when the voltage value of the first detection signal 51g is a first preset value and the second detection signal 52g is a square wave signal, it is determined that the first phase line 41 is open.

When the voltage value of the second detection signal 52g is the first preset value and the second detection signal 52g is a square wave signal, it is determined that the third phase line 43 is open-phase.

When the voltage values of the first detection signal 51g and the second detection signal 52g are square wave signals of the same phase, it is determined that the second phase line 42 is out of phase.

When the voltage values of the first detection signal 51g and the second detection signal 52g are both the first preset value, it is determined that at least two of the first phase line 41, the second phase line 42, and the third phase line 43 are out of phase.

The output circuit 5 includes a first sampling circuit and a second sampling circuit, and a first sampling resistor 57a, a second sampling resistor 57b, a third sampling resistor 57c, and a fourth sampling resistor 57d are provided in the output circuit 5, and in this embodiment, the first sampling resistor 57a and the second sampling resistor 57b constitute the first sampling circuit when the U-phase voltage is higher than the V-phase voltage, and the third sampling resistor 57c and the fourth sampling resistor 57d constitute the second sampling circuit when the V-phase voltage is higher than the W-phase voltage.

The first sampling resistor 57a includes a first sampling resistor 57a and a second sampling resistor 57b, the first sampling resistor 57a is connected to the first phase line 41, the first input terminal 51b of the first optocoupler 51a is connected to the first phase line 41 via the first sampling resistor 57a, the second input terminal 51c of the first optocoupler 51a is connected to the second phase line 42, and the second sampling resistor 57b is connected to the output terminal of the first sampling resistor 57a and the second phase line 42.

The first sampling circuit further includes a first diode 53a, where the first diode 53a is connected between the first input terminal 51b of the first optocoupler 51a and the second input terminal 51c of the first optocoupler 51a, for protecting the first optocoupler 51a from being damaged due to the reverse voltage.

The second sampling circuit includes a third sampling resistor 57c and a fourth sampling resistor 57d, the third sampling resistor 57c is connected to the connection end of the second sampling resistor 57b and the second phase line 42, the first input end 52b of the second optocoupler 52a is connected to the third sampling resistor 57c, the first input end 52b of the second optocoupler 52a is connected to the third phase line 43 via the third sampling resistor 57c, the second input end 52c of the second optocoupler 52a is connected to the third phase line 43, and the fourth sampling resistor 57d is connected to the output end of the third sampling resistor 57c and the third phase line 43.

The second sampling circuit further includes a second diode 53b, where the second diode 53b is connected between the first input end 52b and the second input end of the second optocoupler 52a, and is used for protecting the second optocoupler 52a from being damaged due to the reverse voltage applied to the second optocoupler 52a.

The output circuit 5 further includes a first pull-up resistor 54a and a second pull-up resistor 54b, the first pull-up resistor 54a is disposed in the first optocoupler circuit 51, and the second pull-up resistor 54b is disposed in the second optocoupler circuit 52.

The first pull-up resistor 54a is connected to the first output terminal 51d of the first optocoupler 51a, and the second pull-up resistor 54b is connected to the second output terminal 52f of the second optocoupler 52a, and the first output terminal 51d of the first optocoupler 51a and the second output terminal 52f of the second optocoupler 52a are grounded.

The output circuit 5 further includes a first output resistor 55a and a second output resistor 55b, the first output resistor 55a is disposed in the first optocoupler circuit 51, and the second output resistor 55b is disposed in the second optocoupler circuit 52.

The first output resistor 55a is connected to the first pull-up resistor 54a, the first optocoupler 51a is connected to the first input terminal of the timer 6 via the first output resistor 55a, the second output resistor 55b is connected to the second pull-up resistor 54b, and the second optocoupler 52a is connected to the second input terminal of the timer 6 via the second output resistor 55 b.

The first output resistor 55a outputs a first detection signal 51g detected by the first optocoupler 51a, and the second output resistor 55b outputs a second detection signal 52g detected by the second optocoupler 52a.

The first optocoupler circuit 51 further includes a first capacitor 56a, the second optocoupler circuit 52 further includes a second capacitor 56b, the first capacitor 56a is connected to the output terminal of the first output resistor 55a and the ground signal, and the second capacitor 56b is connected to the output terminal of the second output resistor 55b and the ground signal.

The present application adopts the characteristic that three-phase U, V, W power supplies of the motor 4 mutually form 60 degrees, when a certain phase voltage is higher than another phase voltage, the first optocoupler 51a and/or the second optocoupler 52a are/is turned on, whether the motor 4 is phase-missing is judged according to whether the first output end 51d of the first optocoupler 51a or the first output end 52d of the second optocoupler 52a collects signals, specifically, when the U-phase voltage is higher than the V-phase voltage, the first sampling resistor 57a and the second sampling resistor 57b form a first sampling circuit, so that the voltage divided by the second sampling resistor 57b is high, the first optocoupler 51a is turned on to emit light, the voltage of the first output end on the right side of the first optocoupler 51a is turned from high level to low level, at this time, the first detection signal 51g output by the first output end is detected as a normal signal, and when the U-phase and/or the V-phase is not connected with the motor 4, the normal signal is not present, so that the timer 6 judges that the motor 4 is phase-missing. When the V-phase voltage is higher than the W-phase voltage, the third sampling resistor 57c and the fourth sampling resistor 57d form a second sampling circuit, so that the voltage divided by the fourth sampling resistor 57d is higher than the voltage of the third sampling resistor 57c, the second optocoupler 52a is turned on to emit light, the voltage of the second detection signal 52g output by the second output end 52f of the second optocoupler 52a is changed from high level to low level, and is a detection signal under normal condition at this time, if the V-phase and/or the W-phase is not connected with the motor 4, the normal signal will not be generated, and the timer 6 will directly determine that the motor 4 is a phase failure.

In summary, the output circuit and the timer for detecting the three-phase power supply are connected to the motor in the washing machine, the hardware circuit is adopted and the zero-crossing signal is sampled in cooperation with software, and whether the motor is in a phase failure is detected in a direct judging mode. The weighing value is reflected by the power change value, which is the result obtained by the change of the current value and the voltage value, and the accuracy of the result obtained by the detection mode is improved, which is obviously higher than that estimated by only using the current change and the speed change.

In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A washing machine, comprising:

a housing in which a storage space is formed, and a box opening communicating with the storage space is formed;

the outer barrel is arranged in the shell, a delivery opening corresponding to the box opening is formed on the outer barrel, and the outer barrel is used for receiving washing water;

a drum rotatably provided within the outer cylinder;

the motor is connected to the roller and used for driving the roller to rotate, and the motor is provided with a first phase circuit, a second phase circuit and a third phase circuit of three-phase voltage;

the output circuit is electrically connected with the motor and is used for detecting whether the motor is in a phase failure state or not;

the output circuit comprises a first optical coupler circuit and a second optical coupler circuit;

the first optical coupler circuit is connected with the first phase line and the second phase line and is used for outputting a first detection signal;

the second optical coupler circuit is connected with the second phase circuit and the third phase circuit and is used for outputting a second detection signal;

the timer is connected to the output ends of the first optical coupler circuit and the second optical coupler circuit and is configured to judge whether the motor is out of phase according to whether the voltage value of the first detection signal and/or the second detection signal reaches a first preset value or a second preset value;

when the voltage value of the first detection signal or the voltage value of the second detection signal is a first preset value, the motor is in open phase, the motor stops running, the timer continues to judge, and when the voltage value of the first detection signal and the voltage value of the second detection signal are a second preset value, the motor runs normally.

2. The washing machine of claim 1, wherein the first optocoupler circuit comprises a first optocoupler and the second optocoupler circuit comprises a second optocoupler;

the first input end of the first optocoupler and the second input end of the first optocoupler are respectively connected with the first phase line and the second phase line, and the first output end of the first optocoupler outputs the first detection signal;

the first input end of the second optocoupler and the second input end of the second optocoupler are respectively connected to the second phase line and the second phase line, and the first output end of the second optocoupler outputs the second detection signal.

3. The washing machine according to claim 2, wherein the first preset value is a high level, the second preset value is a low level, and the timer is specifically configured to:

when the voltage value of the first detection signal or the second detection signal is a first preset value, judging that the motor is out of phase, stopping the operation of the motor, and reporting a fault;

and the timer continues to detect, and when the voltage values of the first detection signal and the second detection signal are the second preset value, the motor is judged not to be out of phase, and the motor operates normally.

4. The washing machine as claimed in claim 2, wherein the output circuit includes:

the first input end of the first optocoupler is connected to the first phase line through the first sampling resistor, and the second input end of the first optocoupler is connected to the second phase line;

and the second sampling resistor is connected with the first sampling resistor and the second phase line.

5. The washing machine as claimed in claim 4, wherein the output circuit includes:

the third sampling resistor is connected to the connecting end of the second sampling resistor and the second phase line, the first input end of the second optocoupler is connected to the third sampling resistor, and the second input end of the second optocoupler is connected to the third phase line;

and the fourth sampling resistor is connected with the third sampling resistor and the third phase line.

6. The washing machine as claimed in claim 2, wherein the output circuit further comprises:

the first diode is connected between the first input end of the first optocoupler and the second input end of the first optocoupler;

and the second diode is connected between the first input end of the second optocoupler and the second input end of the second optocoupler.

7. The washing machine as claimed in claim 6, wherein the output circuit further comprises:

the first pull-up resistor is connected to the first output end of the first optocoupler;

the second pull-up resistor is connected to the first output end of the second optocoupler;

8. The washing machine as claimed in claim 7, wherein the output circuit further comprises:

the first output resistor is connected to the first pull-up resistor, and the first optocoupler is connected to the first input end of the timer through the first output resistor;

and the second output resistor is connected with the second pull-up resistor, and the second optocoupler is connected with the second input end of the timer through the second output resistor.

9. The washing machine as claimed in claim 8, wherein the output circuit further comprises:

the first capacitor is connected with the first output resistor and the ground signal;

and the second capacitor is connected with the second output resistor and the ground signal.

10. The washing machine according to claim 1, wherein the washing machine comprises a control module connected to the timer, and the control module is used for alarming and/or controlling the start and stop of the motor according to the phase-failure state detected by the timer.