CN214219114U

CN214219114U - Control device of washing machine

Info

Publication number: CN214219114U
Application number: CN202022755212.4U
Authority: CN
Inventors: 王勇; 白清利; 陈良琳
Original assignee: Shenzhen H&T Intelligent Control Co Ltd
Current assignee: Shenzhen H&T Intelligent Control Co Ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-09-17
Anticipated expiration: 2030-11-24

Abstract

The utility model discloses a washing machine controlling means, washing machine controlling means includes detection portion and control division. The detection part comprises a balance detection module, a state detection module and a detection output port, and the balance detection module and the state detection module are connected with the detection output port; the balance detection module is used for carrying out balance detection on the washing machine barrel and generating a balance detection signal; the state detection module is connected with the alternating current motor and used for detecting the state of the alternating current motor and generating a state detection signal; the control part controls the working mode of the washing machine according to the balance detection signal or controls the working mode of the washing machine and the working state of the alternating current motor according to the state detection signal; the utility model discloses can enough carry out balanced the detection to the washing machine bucket, can carry out state detection and the complete closed-loop control of alternating current motor to the alternating current motor again, improve alternating current motor control's reliability and the security of system.

Description

Control device of washing machine

Technical Field

The utility model relates to the field of electronic technology, especially, relate to a washing machine controlling means.

Background

The alternating current motor is one of the most widely applied devices in the electromechanical industry, is a power source of other electromechanical devices, can be applied to the fields of electronic equipment, machinery, transmission and the like, has not been studied until the research on a driving technology and a detection technology is stopped, and how to obtain more stable and accurate control and feedback detection in the application field is always the main research direction.

Currently, ac motors are used in various home appliances, such as washing machines, range hoods, refrigerators, and the like.

In the prior art, a washing machine control device cannot perform balance detection on a washing machine barrel, and most of alternating current motors applied to the washing machine adopt non-closed-loop control, namely, a control system of the alternating current motors is not controlled by a feedback link, so that the reliability of alternating current motor control and the safety of the system are very low.

Disclosure of Invention

Therefore, in order to solve the above problems, it is necessary to provide a washing machine control device capable of performing balance detection on a washing machine tub and applying closed-loop control to an ac motor applied to a washing machine, so as to improve reliability of ac motor control and system safety.

The utility model discloses a technical means be: there is provided a control device of a washing machine, the control device including: a detection unit and a control unit;

the detection part comprises a balance detection module, a state detection module and a detection output port, and the balance detection module and the state detection module are connected with the detection output port;

the balance detection module is used for carrying out balance detection on the washing machine barrel and generating a balance detection signal;

the state detection module is connected with the alternating current motor and used for detecting the state of the alternating current motor and generating a state detection signal;

the detection output port is used for outputting the balance detection signal or the state detection signal;

and the control part is connected with the detection output port and used for controlling the working mode of the washing machine according to the balance detection signal output by the detection output port or controlling the working state of the alternating current motor according to the state detection signal.

Since the technical scheme is used, the utility model provides a washing machine controlling means includes detection portion and control part. The detection part comprises a balance detection module, a state detection module and a detection output port, and the balance detection module and the state detection module are connected with the detection output port; the utility model discloses a with balanced detection module and state detection module combination, can enough carry out balanced detection to the washing machine bucket, can carry out the state detection to the AC motor again, the control part basis the balanced detection signal that detects the delivery outlet output controls washing machine's mode, or according the state detection signal that detects the delivery outlet output controls AC motor's operating condition, simple structure, and is with low costs to only need to detect the delivery outlet through one with balanced detection signal or state detection signal output to the control part, practiced thrift the control part resource. The utility model discloses an adopt the detection portion to carry out the state detection to AC motor to export AC motor's state for the control part through detecting the delivery outlet, the control part basis the state detection signal that detects the delivery outlet output is right AC motor's operating condition controls, has realized the complete closed-loop control of AC motor, compares with ordinary adoption non-closed loop AC motor control, has greatly improved AC motor control's reliability and systematic security.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Wherein:

FIG. 1 is a first schematic diagram of a control device of a washing machine according to an embodiment;

FIG. 2 is a second schematic structural diagram of a control device of the washing machine according to an embodiment;

FIG. 3 is a third schematic structural diagram of a control device of the washing machine according to an embodiment;

FIG. 4 is a schematic circuit diagram of a detection section in one embodiment;

FIG. 5 is a schematic circuit diagram of a driving section in one embodiment;

fig. 6 is a schematic circuit diagram of the control section in one embodiment.

In the figure: 1. a detection unit; 2. a control unit; 3. a drive section; 4. an alternating current motor; 11. a balance detection module; 12. a state detection module; 13. a detection output port; 31. a forward rotation driving module; 32. a reverse drive module; 111. a balance detection switch; 121. an isolation feedback circuit; 122. a rectifying circuit; 311. a forward rotation drive circuit; 312. a forward rotation controllable switch; 321. an inversion driving circuit; 322. the controllable switch is reversed.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The terms first, second and the like in the description and in the claims, and in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be practiced otherwise than as specifically illustrated.

The utility model provides a washing machine control device, in one embodiment, as shown in figure 1, the washing machine control device can comprise a detection part 1 and a control part 2; the detection part 1 may include a balance detection module 11, a state detection module 12 and a detection output port 13, and the balance detection module 11 and the state detection module 12 are connected to the detection output port 13; the balance detection module 11 can be used for performing balance detection on the washing machine barrel and generating a balance detection signal; the state detection module 12 may be connected to the ac motor 4, and is configured to perform state detection on the ac motor 4 and generate a state detection signal; the detection output port 13 may be configured to output the balance detection signal and the state detection signal; the control part 2 may be connected to the detection output port 13, and is configured to control an operation mode of the washing machine according to the balance detection signal output by the detection output port 13, or control an operation state of the ac motor 4 according to the state detection signal.

The washing machine control device provided by the embodiment can perform balance detection on the washing machine barrel and perform state detection on the alternating current motor 4 by combining the balance detection module 11 and the state detection module 12, wherein the state detection can include forward rotation and reverse rotation detection on the alternating current motor 4 and detection on whether stalling occurs, the structure is simple, the cost is low, and only one detection output port 13 is needed to output a detection signal to the control part 2, so that the resource of the control part 2 is saved. In the embodiment, the state of the alternating current motor 4 is detected by the detection part 1, the state of the alternating current motor 4 is output to the control part 2 through the detection output port 13, and the control part 2 controls the working state of the alternating current motor 4 according to the state detection signal output by the detection output port 13, so that the complete closed-loop control of the alternating current motor 4 is realized, and compared with the control of a common non-closed-loop alternating current motor, the reliability of the control of the alternating current motor 4 and the safety of a system are greatly improved.

In one embodiment, the control part 2 is used for controlling the washing machine to enter a normal operation mode when the detection part 1 detects that the washing machine barrel is balanced; the control part 2 is used for controlling the washing machine to enter a balance adjustment mode under the condition that the detection part 1 detects that the washing machine barrel is not balanced; the control part 2 is used for controlling the forward rotation speed of the alternating current motor 4 when the detection part 1 detects that the alternating current motor 4 rotates forward; the control unit 2 is configured to control a reverse rotation speed of the ac motor 4 when the detection unit 1 detects that the ac motor 4 is rotating in reverse; the control unit 2 is configured to control the ac motor 4 to stop rotating when the detection unit 1 detects that the ac motor 4 is locked.

Specifically, before the washing machine does not enter a normal working mode, laundry is put into a washing machine barrel, if the detection part 1 detects that the washing machine is unbalanced, namely, the laundry put into the washing machine barrel causes the washing machine barrel to be unbalanced, the detection part 1 outputs a balance detection signal to the control part 2, and the control part 2 controls the washing machine to enter a balance adjustment mode until the washing machine barrel is balanced; if the detection part 1 detects that the washing machine is balanced, that is, the clothes put into the washing machine barrel do not cause the washing machine barrel to be unbalanced, the detection part 1 outputs a balance detection signal to the control part 2, and the control part 2 controls the washing machine to enter a normal working mode.

Specifically, after the washing machine enters a normal operation mode, the control part 2 outputs a control signal to control the rotation of the ac motor, wherein the control signal includes a forward rotation control signal and a reverse rotation control signal. Meanwhile, the detection part 1 detects the state of the alternating current motor 4 and outputs a detection signal to the control part 2 through the detection output port 13. Further, when the detection unit 1 detects that the ac motor 4 rotates in the forward direction, the control unit 2 may control the speed of the ac motor 4 rotating in the forward direction by adjusting the control signal. When the detection unit 1 detects that the ac motor 4 is reversely rotated, the control unit 2 may control a speed at which the ac motor 4 is reversely rotated by adjusting the control signal. When the detecting portion 1 detects that the ac motor 4 is locked, the control portion 2 may control the ac motor 4 to stop rotating by adjusting the control signal.

In one embodiment, the washing machine control device may further include a power supply for supplying power to the washing machine control device. The power supply may provide the washing machine control device with a supply voltage of an operating voltage, for example +3.3V, +5V, +12V, although the supply voltage may be other voltage values suitable for use. The power supply has a power terminal and an isolated ground terminal.

In an embodiment, as shown in fig. 6, the control unit 2 employs a single chip microcomputer U4, the single chip microcomputer U4 may employ FREESCALE or MC9S08AC16CFGE, of course, the single chip microcomputer U4 may employ other models, the single chip microcomputer U4 employs +5V dc power supply, the first filter capacitor C11 and the second filter capacitor C12 are power filter capacitors of the single chip microcomputer U4, and an I/O port of the single chip microcomputer U4 outputs the forward rotation control signal Ctrl CW, the reverse rotation control signal Ctrl CCW, and a receiving input detection signal Motor sensor. Further, a 32 th pin of the single chip microcomputer U4 receives the detection signal Motor sensor, a 43 th pin of the single chip microcomputer U4 outputs the forward rotation control signal Ctrl CW, and a 40 th pin of the single chip microcomputer U4 outputs the reverse rotation control signal Ctrl CCW. Further, when the washing machine enters a normal operation mode, the I/O port of the single chip microcomputer U4 outputs the forward rotation control signal Ctrl CW and the reverse rotation control signal Ctrl CCW. Of course, the control unit 2 may also adopt a DSP, an FPGA, and other control modules with equivalent functions, and the present application is not particularly limited.

In this embodiment, singlechip U4 adopts 1 IO mouth can realize carrying out balanced detection to the washing machine bucket, and is right alternating current motor 4 carries out corotation and reversal detection to and whether take place the stifled commentaries on classics and detect, practiced thrift singlechip U4 resource.

In one embodiment, as shown in fig. 3, the balance detection module 11 may include a balance detection switch 111, and the balance detection switch 111 may be used to perform balance detection on the washing machine tub according to a plane inclination angle and/or a change in center of gravity of the washing machine tub; the balance detecting switch 111 is disposed beside the washing machine tub; when the balance detection switch 111 detects that the washing machine barrel is balanced, the balance detection switch 111 is turned off; when the balance detection switch 111 detects that the washing machine tub is unbalanced, the balance detection switch 111 is closed.

Specifically, the balance detecting switch 111 may be disposed at a side of the washing machine tub, or may be disposed at a lower side of the washing machine tub, and the present application is not particularly limited as long as a switch contact of the balance detecting switch 111 faces the washing machine tub. Further, if the washing machine barrel shakes in a large amplitude, the washing machine barrel will touch the switch contact of the balance detection switch 111, the balance detection switch 111 is closed, the detection part 1 outputs a balance detection signal to the control part 2, and the control part 2 controls the washing machine to enter a balance adjustment mode according to the balance detection signal output by the detection part 1 until the washing machine barrel is balanced.

In one embodiment, referring to fig. 4, the balance detection module 11 may further include a first resistor R70 and a clamping diode D20. In the figure, CON4 is an interface of the balance detecting switch 111, and is used to connect the balance detecting switch 111. First resistance R70 does the detection signal Motor sensor arrives singlechip U4's current-limiting resistance, clamp diode D20 is the schottky diode, does the clamping action, ensures that detection signal Motor sensor inputs the signal of singlechip does not exceed mains voltage, the protection the IO mouth of singlechip.

For example, referring to fig. 4, a first terminal of the balance detection switch 111 interface CON4 is connected to an isolated ground terminal, a second terminal of the balance detection switch 111 interface CON4 is connected to a first terminal of the first resistor R70, a second terminal of the first resistor R70 is connected to the detection output port 13 and a common terminal of the clamping diode D20, a positive terminal of the clamping diode D20 is connected to the isolated ground terminal, and a negative terminal of the clamping diode D20 receives + 5V.

Specifically, the working principle of the balance detection of the washing machine barrel is as follows: referring to fig. 4 and 5, when the control unit 2 controls the ac motor 4 to stop rotating, that is, when the forward rotation control signal Ctrl CW and the reverse rotation control signal Ctrl CCW output by the control unit 2 are both low logic levels, the state detection module 12 only performs balance detection on the washing machine tub.

Specifically, as shown in fig. 4, if the balance detection switch 111 is turned off, the balance detection module 11 is in an off state at this time, since the detection output port 13 is connected to the common end of the clamping diode D20, the detection signal Motor sensor output by the detection output port 13, that is, the potential of the balance detection signal, is forcibly pulled to +5V, that is, a high logic level, the control unit 2 determines that the washing machine tub is in a balanced state, and the control unit 2 controls the washing machine to enter a normal operation mode.

Specifically, as shown in fig. 4, if the balance detection switch 111 is closed, the balance detection module 11 is in an on state at this time, and at this time, since the detection output port 13 is connected to the common end of the clamping diode D20, the detection signal Motor sensor output by the detection output port 13 is forced to be pulled down, that is, the potential of the balance detection signal is forced to be lowered, that is, at a low logic level, the control part 2 determines that the washing machine tub is in an unbalanced state, and the control part 2 controls the washing machine to enter a balance adjustment mode to adjust the washing machine tub to be balanced until the balance detection signal is at a high logic level, so that the washing machine tub is balanced.

Further, the relationship between the forward rotation control signal Ctrl CW, the reverse rotation control signal Ctrl CCW, the balance detection switch 111, and the detection signal Motor sensor and the detection result can be seen in table one.

In one embodiment, as shown in fig. 3, the state detection module 12 may include an isolation feedback circuit 121 and a rectification circuit 122, a first end of the rectification circuit 122 may be connected to the ac motor 4, a second end of the rectification circuit 122 and the ac motor 4 are both connected to a first end of the isolation feedback circuit 121, and a second end of the isolation feedback circuit 121 is connected to the detection output port 13; the rectifying circuit 122 may be configured to perform a rectifying process on the ac motor voltage signal to obtain a first rectified voltage signal; the isolation feedback circuit 121 may be configured to perform electrical isolation and state feedback detection on the first rectified voltage signal and the ac motor voltage signal, and then output the state detection signal.

For example, referring to fig. 4, the isolation feedback circuit 121 may include a photo coupler OP1, a second resistor R20, a third resistor R11, a fourth resistor R19, a first transistor Q4, a fifth resistor R23, and a third filter capacitor C27. The third resistor R11 is the current-limiting resistor of first triode Q4 base, the fourth resistor R19 is the pull-down resistor of first triode Q4 base, the second resistor R20 is the pull-up resistor of first triode Q4, the fifth resistor R23 is the current-limiting resistor of singlechip U4 input, third filter capacitor C27. Specifically, a control end of the photocoupler OP1 is connected to the rectifying circuit 122 and the alternating current motor 4, that is, an anode of the light emitting diode in the photocoupler OP1 is connected to the alternating current motor 4, a cathode of the light emitting diode in the photocoupler OP1 is connected to the rectifying circuit 122, a collector of the phototriode in the photocoupler OP1 receives +5V and is connected to a first end of the second resistor R20, and a second end of the second resistor R20 is connected to a first end of the fifth resistor R23 and is connected to a collector of the first triode Q4; the base electrode of the first triode Q4 is connected with the emitter electrode of the first triode Q4 through the fourth resistor R19, is connected with an isolated ground terminal, is connected with the first end of the third resistor R11, and the second end of the third resistor R11 is connected with the emitter electrode of the phototriode in the photocoupler OP 1; a second terminal of the fifth resistor R23 is connected to an isolated ground terminal via the third filter capacitor C27, and a second terminal of the fifth resistor R23 is connected to the detection output port 13. Further, as shown in fig. 4, a second terminal of the first resistor R70 is connected to a second terminal of the fifth resistor R23. The second end of the first resistor R70 outputs the detection signal Motor sensor.

Illustratively, referring to fig. 4, the rectifying circuit 122 may include a rectifying diode D12 and a sixth resistor R96. The cathode of the rectifier diode D12 is connected to the ac motor 4 for receiving the voltage signal CW of the ac motor 4, the anode of the rectifier diode D12 is connected to the first end of the sixth resistor R96, and the second end of the sixth resistor R96 is connected to the isolation feedback circuit 121. The sixth resistor R96 is a current limiting resistor. Further, an anode of the led in the photocoupler OP1 receives the input voltage signal CCW of the ac motor 4, and a cathode of the led in the photocoupler OP1 is connected to the second end of the sixth resistor R96.

Specifically, the working principle of the reverse rotation detection of the alternating current motor 4 is as follows: referring to fig. 4 and 5, when the forward rotation control signal Ctrl CW output from the control unit 2 is at a low logic level and the reverse rotation control signal Ctrl CCW is at a high logic level in a state where the washing machine tub is balanced, that is, in a state where the balance detection switch 111 is turned off, the emitter of the phototransistor in the photocoupler OP1 is turned on, and simultaneously the collector and the emitter of the phototransistor in the photocoupler OP1 are turned on, so that the base of the first triode Q4 is turned on by +5V voltage, and the first triode Q4 is turned on, the test point TP149 becomes at a low logic level, and the detection signal Motor sensor, that is, the state detection signal, becomes at a low logic level and is output to the control unit 2, and the control unit 2 determines that the ac Motor 4 is reversely rotated.

Specifically, the working principle of the positive rotation detection of the alternating current motor 4 is as follows: referring to fig. 4 and 5, when the forward rotation control signal Ctrl CW output from the control unit 2 is at a high logic level and the reverse rotation control signal Ctrl CCW output from the control unit 2 is at a low logic level in a case where the balance detection switch 111 is turned off, the emitter of the phototransistor in the photocoupler OP1 is turned off, and the collector and the emitter of the phototransistor in the photocoupler OP1 are turned off, so that a +5V voltage is output through the second resistor R20 and the fifth resistor R23, the test point TP144 becomes a high logic level, and the detection signal Motor sensor, i.e., the state detection signal, becomes a high logic level and is output to the control unit 2, and the control unit 2 determines that the ac Motor 4 is rotating in the forward direction.

Specifically, the working principle of the locked-rotor detection of the alternating current motor 4 is as follows: referring to fig. 4 and 5, when the forward rotation control signal Ctrl CW output from the control unit 2 is at a low logic level and the reverse rotation control signal Ctrl CCW is at a high logic level when the balance detection switch 111 is off, and when the ac motor 4 is locked, the reverse coil of the ac motor 4 is approximately short-circuited, the voltage signal CW of the ac motor 4 is at a high logic level, the photocoupler OP1 is not operated, the first triode Q4 is turned off, and the test point TP144 is at a high logic level, the control unit 2 may determine that the forward coil of the ac motor 4 is open or the reverse coil is locked and short-circuited. Further, the control unit 2 may set both the forward rotation control signal Ctrl CW and the reverse rotation control signal Ctrl CCW to a low logic level, so as to stop the rotation of the ac motor 4 and stop the control of the ac motor 4, thereby protecting the ac motor 4, the first SCR5, and the second SCR6 from being damaged.

The detection part 1 in the embodiment combines the balance detection module 11 and the state detection module 12, so that the balance detection of the washing machine barrel and the forward rotation, reverse rotation and locked rotor detection of the alternating current motor 4 can be realized in one circuit, and the circuit is simple and has low cost. And the detection part 1 outputs the detected signal to the control part 2 through only one detection output port 13, thereby saving the resources of the control part 2. And the state detection module 12 adopts an isolation scheme, so that the washing machine control device is safer and more reliable. In this embodiment, the detection part 1 is adopted to detect the state of the ac motor 4, and the state of the ac motor 4 is output to the control part 2 through the detection output port 13, and the control part 2 controls the working state of the ac motor 4 according to the detection signal output by the detection output port 13, thereby realizing the complete closed-loop control of the ac motor 4. Compared with the common control by adopting the non-closed-loop AC motor, the reliability of the control of the AC motor and the safety of the system are greatly improved.

In one embodiment, as shown in fig. 2, the control device of the washing machine may further include a driving part 3, and the driving part 3 may be connected to the control part 2 and the ac motor 4 for driving the ac motor to rotate according to the control signal output by the control part 2.

In one embodiment, as shown in fig. 3, the driving part 3 may include a forward rotation driving module 31 and a reverse rotation driving module 32. The forward rotation driving module 31 may include a forward rotation driving circuit 311 and a forward rotation controllable switch 312, one end of the forward rotation driving circuit 311 is connected to the control unit 2, the other end of the forward rotation driving circuit 311 is connected to one end of the forward rotation controllable switch 312, and the other end of the forward rotation controllable switch 312 is connected to the ac motor 4; the forward rotation driving module can be used for driving the alternating current motor 4 to rotate forward according to the forward rotation control signal; the reverse driving module 32 may include a reverse driving circuit 321 and a reverse controllable switch 322, one end of the reverse driving circuit 321 is connected to the control unit 2, the other end of the reverse driving circuit 321 is connected to one end of the reverse controllable switch 322, and the other end of the reverse controllable switch 322 is connected to the ac motor 4; the reverse driving module may be configured to drive the ac motor 4 to reverse according to a reverse control signal.

For example, referring to fig. 5, the inversion driving circuit 321 may include a seventh resistor R8, an eighth resistor R9, a ninth resistor R10, a tenth resistor R11, and a second transistor TR 1; the reverse controllable switch 322 may be the first SCR5, or may be another switch capable of receiving a switch control signal to perform a switching operation. The tenth resistance R11 is the base current-limiting resistance of the second triode TR1, the ninth resistance R10 is the base pull-down resistance of the second triode TR1, the seventh resistance R8 is the collector pull-up resistance of the second triode TR1, and the eighth resistance R9 is the collector current-limiting resistance of the second triode TR 1. Specifically, a first end of the tenth resistor R11 is connected to the control unit 2 and configured to receive the inversion control signal Ctrl CCW, and a second end of the tenth resistor R11 is connected to the base of the second transistor TR1 and to a first end of the ninth resistor R11; a second end of the ninth resistor R10 is connected with an emitter of the second transistor TR1 and is connected with 0V; a collector of the second transistor TR1 is connected to a first end of the eighth resistor R9, a second end of the eighth resistor R9 is connected to a control electrode of the first SCR5 and to a first end of the seventh resistor R8, and a second end of the seventh resistor R8 receives 5V; the second electrode of the first SCR5 receives 5V, and the first electrode of the first SCR5 is connected to the ac motor 4, and is configured to output a voltage signal CCW of the ac motor 4.

For example, referring to fig. 5, the forward rotation driving circuit 311 may include an eleventh resistor R12, a twelfth resistor R13, a thirteenth resistor R14, a fourteenth resistor R15, and a third transistor TR 2; the forward rotation controllable switch 312 may be the second SCR6, or may be another switch capable of receiving a switch control signal to perform a switching operation. The fourteenth resistor R15 is a base current-limiting resistor of the third transistor TR2, the thirteenth resistor R14 is a base pull-down resistor of the third transistor TR2, the eleventh resistor R12 is a collector pull-up resistor of the third transistor TR2, and the twelfth resistor R13 is a collector current-limiting resistor of the third transistor TR 2. Specifically, a first end of the fourteenth resistor R15 is connected to the control unit 2 for receiving the forward rotation control signal Ctrl CW, and a second end of the fourteenth resistor R15 is connected to the base of the third transistor TR2 and to a first end of the thirteenth resistor R14; a second end of the thirteenth resistor R14 is connected with an emitter of the third transistor TR2 and is connected with 0V; a collector of the third transistor TR2 is connected to a first end of the twelfth resistor R13, a second end of the twelfth resistor R13 is connected to a control electrode of the second SCR6 and to a first end of the eleventh resistor R12, and a second end of the eleventh resistor R12 receives 5V; the second electrode of the second SCR6 receives 5V, and the first electrode of the second SCR6 is connected to the ac motor 4 for outputting a voltage signal CW of the ac motor 4.

Specifically, the working principle of the reverse rotation control of the alternating current motor 4 is as follows: referring to fig. 5, when the control unit 2 outputs the reverse rotation control signal Ctrl CCW at a high logic level, the second transistor TR1 is turned on, the control electrode of the first SCR5 is at a low logic level, and the first SCR5 is turned on at all corners to drive the ac motor 4 to rotate reversely; when the control unit 2 outputs the inversion control signal Ctrl CCW at a low logic level, the second transistor TR1 is turned off, the first thyristor SCR5 controls the high logic level, the first thyristor SCR5 is turned off, and the ac motor 4 stops rotating. Further, the control unit 2 may input a required PWM signal, that is, the duty ratio of the reverse rotation control signal Ctrl CCW may be adjusted to adjust the conduction angle of the first SCR5, so as to adjust the speed of the ac motor 4, and further control the reverse rotation speed of the ac motor 4.

Specifically, the working principle of the positive rotation control of the alternating current motor 4 is as follows: referring to fig. 5, when the control unit 2 outputs the forward rotation control signal Ctrl CW at a high logic level, the third transistor TR2 is turned on, the control electrode of the second SCR6 is at a low logic level, and the second SCR6 is turned on at a full angle to drive the ac motor 4 to rotate forward; when the control unit 2 outputs the forward rotation control signal Ctrl CW at a low logic level, the third transistor TR2 is turned off, the second SCR6 controls the high logic level, the second SCR6 is turned off, and the ac motor 4 stops rotating. Furthermore, the control unit 2 may input a required PWM signal, that is, the duty ratio of the forward rotation control signal Ctrl CW may be adjusted to adjust the conduction angle of the second SCR6, so that the ac motor 4 adjusts the speed of the ac motor 4, and further, the forward rotation speed of the ac motor 4 is controlled.

The device model and parameters in the embodiment of the present application may be appropriately adjusted according to actual needs and design requirements, and the present application is not limited.

In one embodiment, the detection part 1 detects the washing machine barrel and the alternating current motor 4 in a time-sharing manner; under the condition that the control part 2 controls the alternating current motor 4 to stop rotating, the detection part 1 carries out balance detection on the washing machine barrel; the control part 2 determines whether the washing machine tub is balanced based on a detection signal Motor sensor output from the detection output port 13; the detection part 1 detects the state of the alternating current motor 4 under the condition that the washing machine barrel is balanced; the control unit 2 determines whether the ac Motor 4 is rotating in the forward direction, the reverse direction, or locked-rotor based on the forward rotation control signal Ctrl CW and the reverse rotation control signal Ctrl CCW output from the control unit 2, and the detection signal Motor sensor output from the detection output port 13.

In one embodiment, the detection signal Motor sensor output by the detection output port 13, the forward rotation control signal Ctrl CW and the reverse rotation control signal Ctrl CCW each have a first state and a second state, and the first state and the second state have opposite level logic states; when the forward rotation control signal Ctrl CW output by the control unit 2 is in the first state and the reverse rotation control signal Ctrl CCW is in the second state, the forward rotation controllable switch 312 is turned off, the reverse rotation controllable switch 322 is turned on, and the control unit 2 controls the ac motor 4 to rotate in reverse; when the forward rotation control signal Ctrl CW output by the control unit 2 is in the second state and the reverse rotation control signal Ctrl CCW is in the first state, the forward rotation controllable switch 312 is turned on, the reverse rotation controllable switch 322 is turned off, and the control unit 2 controls the ac motor 4 to rotate forward; when both the forward rotation control signal Ctrl CW and the reverse rotation control signal Ctrl CCW output from the control unit 2 are in the first state, both the forward rotation controllable switch 312 and the reverse rotation controllable switch 322 are turned off, and the control unit 2 controls the ac motor 4 to stop rotating. Further, the first state in this application is a low logic level, and the second state is a high logic level.

The washing machine control device provided in this embodiment can detect the state of the ac motor 4 and output a state detection signal to the control unit 2, and the control unit 2 controls the operating state of the ac motor 4 based on the state detection signal. When the detection unit 1 detects that the ac motor 4 rotates forward, the control unit 2 may adjust a duty ratio of the forward rotation control signal Ctrl CW to control a forward rotation speed of the ac motor 4, thereby implementing forward rotation closed-loop control of the ac motor 4. When the detection unit 1 detects that the ac motor 4 is reversely rotated, the control unit 2 may adjust a duty ratio of the reverse rotation control signal Ctrl CCW to control a reverse rotation speed of the ac motor 4, so as to implement reverse closed-loop control of the ac motor 4.

In one embodiment, the balance detection module 11 may include a balance detection switch 111; the balance detecting switch 111 is disposed beside the washing machine tub; under the condition that the control part 2 controls the alternating current motor 4 to stop rotating, if the balance detection switch 111 is closed, the detection signal output by the detection output port 13 is in a first state, and the control part 2 determines that the washing machine barrel is in an unbalanced state. If the balance detection switch 111 is turned off under the condition that the control part 2 controls the alternating current motor 4 to stop rotating, the detection signal output by the detection output port 13 is in the second state at this time, and the control part 2 determines that the washing machine barrel is in the balanced state.

The washing machine control device provided by this embodiment can perform balance detection on the washing machine barrel and output a balance detection signal to the control part 2, the control part 2 controls the working mode of the washing machine based on the balance detection signal, when the detection part 1 detects that the washing machine barrel is balanced, the control part 2 controls the washing machine to enter a normal working mode, and when the detection part 1 detects that the washing machine barrel is unbalanced, the control part 2 controls the washing machine to enter a balance working mode until the washing machine barrel is balanced, thereby realizing balance detection and control of the washing machine barrel.

In one embodiment, the state detection module 12 may include a photocoupler, a control end of which is connected to the ac motor 4, and an output end of which is connected to the detection output port 13; under the condition that the washing machine barrel is balanced, when a forward rotation control signal output by the control part 2 is in a first state and a reverse rotation control signal is in a second state, the photoelectric coupler is conducted, a detection signal output by the detection output port 13 is in the first state, and the control part 2 determines that the alternating current motor 4 reversely rotates; under the condition that the washing machine barrel is balanced, when the forward rotation control signal output by the control part 2 is in a second state and the reverse rotation control signal is in a first state, the photoelectric coupler is cut off, the detection signal output by the detection output port 13 is in the second state, and the control part 2 determines that the alternating current motor 4 rotates forwards; under the condition that the washing machine barrel is balanced, when the forward rotation control signal output by the control part 2 is in a first state and the reverse rotation control signal is in a second state, the photoelectric coupler is cut off, the detection signal output by the detection output port 13 is in the second state, and the control part 2 determines that the alternating current motor 4 is locked.

The control device of the washing machine according to this embodiment may perform forward rotation, reverse rotation, and stalling detection on the ac motor and output a state detection signal to the control unit 2, where the control unit 2 determines that the ac motor is in forward rotation, reverse rotation, or stalling based on the forward rotation control signal, the reverse rotation control signal, and the state detection signal. The control part 2 can also control the alternating current motor 4 according to the working state of the alternating current motor 4, so as to realize the complete closed-loop control of the alternating current motor 4. When the detection unit 1 detects that the ac motor 4 rotates forward, the control unit 2 may adjust a duty ratio of the forward rotation control signal Ctrl CW to control a forward rotation speed of the ac motor 4, thereby implementing forward rotation closed-loop control of the ac motor 4. When the detection unit 1 detects that the ac motor 4 is reversely rotated, the control unit 2 may adjust a duty ratio of the reverse rotation control signal Ctrl CCW to control a reverse rotation speed of the ac motor 4, thereby implementing closed-loop control of reverse rotation of the ac motor 4. When the detection unit 1 detects that the ac motor 4 is locked, the control unit 2 may set both the forward rotation control signal Ctrl CW and the reverse rotation control signal Ctrl CCW to a low logic level, so as to stop the rotation of the ac motor 4, thereby stopping the control of the ac motor 4, and protecting the ac motor 4, the first SCR5, and the second SCR6 from being damaged. Compared with the common control by adopting the non-closed-loop AC motor, the reliability of the control of the AC motor and the safety of the system are greatly improved.

In the above embodiments, please refer to table one for the relationship between the forward rotation control signal Ctrl CW, the reverse rotation control signal Ctrl CCW, the balance detection switch 111, the detection signal Motor sensor, and the detection result.

Table one: truth table

Ctrl CW	Ctrl CCW	Balance detection switch	Motor sensor	The result of the detection
					0	0	Disconnect	H	Balancing
0	0	Closure is provided	L	Is not balanced
					0	1	Disconnect	L	Reverse rotation
1	0	Disconnect	H	Forward rotation
					0	1	Disconnect	H	Locked rotor

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A control device of a washing machine, characterized in that the control device comprises: a detection unit and a control unit;

2. The washing machine control apparatus as claimed in claim 1, wherein the balance detecting module comprises:

the balance detection switch is used for carrying out balance detection on the washing machine barrel according to the plane inclination angle and/or the gravity center change of the washing machine barrel; the balance detection switch is arranged beside the washing machine barrel.

3. The washing machine control apparatus as claimed in claim 2, wherein the balance detecting module further comprises: a first resistor and a clamping diode;

the first end of the balance detection switch is connected with an isolation grounding end, the second end of the balance detection switch is connected with the first end of the first resistor, the second end of the first resistor is connected with the detection output port and the common end of the clamping diode, the positive end of the clamping diode is connected with the isolation grounding end, and the negative end of the clamping diode receives power supply voltage.

4. The washing machine control apparatus as claimed in claim 1, wherein the state detection module comprises: a rectifying circuit and an isolation feedback circuit;

the first end of the rectification circuit is connected with the alternating current motor, the second end of the rectification circuit and the alternating current motor are both connected with the first end of the isolation feedback circuit, and the second end of the isolation feedback circuit is connected with the detection output port;

the rectifying circuit is used for rectifying the voltage signal of the alternating current motor to obtain a first rectified voltage signal;

and the isolation feedback circuit is used for carrying out electrical isolation and state feedback detection on the first rectified voltage signal and the alternating current motor voltage signal and then outputting the state detection signal.

5. The washing machine control device of claim 4 wherein the isolated feedback circuit comprises: the photoelectric coupler, the second resistor, the third resistor, the fourth resistor, the first triode, the fifth resistor and the third filter capacitor;

the control end of the photoelectric coupler is connected with the rectifying circuit and the alternating current motor, the collector electrode of a phototriode in the photoelectric coupler receives power supply voltage and is connected with the first end of the second resistor, and the second end of the second resistor is connected with the first end of the fifth resistor and is connected with the collector electrode of the first triode; the base electrode of the first triode is connected with the emitting electrode of the first triode through the fourth resistor, is connected with an isolation grounding end and is connected with the first end of the third resistor, and the second end of the third resistor is connected with the emitting electrode of the photosensitive triode in the photoelectric coupler; and the second end of the fifth resistor is connected with an isolation grounding end through the third filter capacitor, and the second end of the fifth resistor is connected with the detection output port.

6. The control device of the washing machine according to claim 4, wherein the rectifying circuit comprises: a rectifier diode and a sixth resistor;

the cathode of the rectifier diode is connected with the alternating current motor, the anode of the rectifier diode is connected with the first end of the sixth resistor, and the second end of the sixth resistor is connected with the isolation feedback circuit.

7. The washing machine control device as claimed in claim 1, further comprising:

and the driving part is connected with the control part and the alternating current motor and is used for driving the alternating current motor to rotate according to the control signal output by the control part.

8. The washing machine control device of claim 7, wherein the drive section comprises:

the forward rotation driving module comprises a forward rotation driving circuit and a forward rotation controllable switch, one end of the forward rotation driving circuit is connected with the control part, the other end of the forward rotation driving circuit is connected with one end of the forward rotation controllable switch, and the other end of the forward rotation controllable switch is connected with the alternating current motor; the forward rotation driving module is used for driving the alternating current motor to rotate forward according to the forward rotation control signal; and

the reversing driving module comprises a reversing driving circuit and a reversing controllable switch, one end of the reversing driving circuit is connected with the control part, the other end of the reversing driving circuit is connected with one end of the reversing controllable switch, and the other end of the reversing controllable switch is connected with the alternating current motor; the reverse driving module is used for driving the alternating current motor to reversely rotate according to a reverse control signal.

9. The control device of a washing machine according to claim 8, wherein the inversion drive circuit comprises: a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and a second triode; the reverse controllable switch is a first controllable silicon;

a first end of the tenth resistor is connected with the control part, and a second end of the tenth resistor is connected with a base electrode of the second triode and a first end of the ninth resistor; the second end of the ninth resistor is connected with the emitter of the second triode and is connected with 0V; a collector of the second triode is connected with a first end of the eighth resistor, a second end of the eighth resistor is connected with a control electrode of the first controllable silicon and a first end of the seventh resistor, and a second end of the seventh resistor receives power supply voltage; and the second electrode of the first controllable silicon receives power supply voltage, and the first electrode of the first controllable silicon is connected with the alternating current motor.

10. The washing machine control device of claim 8, wherein the forward rotation drive circuit comprises: an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor and a third triode; the forward rotation controllable switch is a second silicon controlled rectifier;

a first end of the fourteenth resistor is connected with the control part, and a second end of the fourteenth resistor is connected with a base electrode of the third triode and a first end of the thirteenth resistor; the second end of the thirteenth resistor is connected with the emitter of the third triode and is connected with 0V; a collector of the third triode is connected with a first end of the twelfth resistor, a second end of the twelfth resistor is connected with a control electrode of the second controllable silicon and a first end of the eleventh resistor, and a second end of the eleventh resistor receives a power supply voltage; and a second electrode of the second controllable silicon receives power supply voltage, and a first electrode of the second controllable silicon is connected with the alternating current motor.