Washing machine operation imbalance detection circuit

Abstract

The utility model relates to the technical field of household appliances, in particular to a washing machine operation imbalance detection circuit which comprises a single chip microcomputer module, a load module, a power module, a photoelectric detection module, a door cover detection module and a water level detection module, and the load module, the power module, the photoelectric detection module, the door cover detection module and the water level detection module are connected with the single chip microcomputer module. The load module adopts a plurality of bidirectional thyristors, the power supply module adopts a power supply management chip I C2, the photoelectric detection module adopts a photoelectric switch CN2, and whether the washing machine runs in an unbalanced mode or not is judged by detecting disconnection and connection signals of the photoelectric switch CN2; according to the non-contact type washing machine running unbalance detection device, non-contact type detection of washing machine running unbalance is achieved through the photoelectric detection technology, the problem of installation limitation of a traditional physical sinker bar device is solved, the non-contact type washing machine running unbalance detection device can be suitable for a complete machine type washing machine and a non-complete machine type washing machine, the application range is wide, and reliable guarantee is provided for safe running of the washing machine.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, specifically to a circuit for detecting unbalanced operation of a washing machine. Background Technology

[0002] Imbalance detection in washing machines is a crucial function to ensure stable operation. When a washing machine operates unbalancedly, it can lead to increased overall vibration and noise, and may even damage the equipment or create safety hazards.

[0003] Existing washing machine imbalance detection technologies rely on physical impact rods installed on the outer tub wall. For example, a published Chinese patent, CN215628812U, discloses a washing machine including a cabinet, base, drum assembly, balancing device, and alarm device. The base is located at the lower end of the cabinet, the drum assembly is located inside the cabinet, and the balancing device is located between the drum assembly and the cabinet. The balancing device includes a mounting base and a balance rod. The mounting base is connected to the base, one end of the balance rod is movably mounted on the mounting base, and the other end extends to one side of the drum assembly. The alarm device is located on the mounting base; when the drum assembly impacts the balance rod, the alarm is triggered. This patent relies on the installation of a balance rod to achieve physical detection of imbalance in non-whole-machine washing machines. This method has the following shortcomings:

[0004] 1. The stabilizer bar is easily damaged, has high maintenance costs, and is not aesthetically pleasing after installation. The customer requested that the bumper bar device be removed.

[0005] 2. In a fully-fledged washing machine, such a device cannot be installed on the outer tub wall, which means that the disclosed patent cannot effectively detect the unbalanced state of the inner tub, and there is still a risk of the machine tipping over or being damaged. Utility Model Content

[0006] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a washing machine unbalance detection circuit to solve the problems of high maintenance costs, unsightly appearance, and limited installation of the impact rod device in the prior art that rely on physical impact rod devices to detect washing machine unbalance.

[0007] To achieve the above and other related objectives, this utility model provides a washing machine imbalance detection circuit, the detection circuit comprising:

[0008] The microcontroller module uses a microcontroller U1 to control the operation of the washing machine.

[0009] The load module uses multiple bidirectional thyristors, which are used to control the water inlet, motor forward rotation, reverse rotation, and drainage signal output during the operation of the washing machine.

[0010] The power module uses a power management chip IC2 to control the power output;

[0011] The photoelectric detection module uses a photoelectric switch CN2 to determine whether the washing machine is operating unbalanced by detecting the open and closed signals of the photoelectric switch CN2.

[0012] In one embodiment of the present invention, the photoelectric switch CN2 includes a transmitter and a receiver. The transmitter is a light-emitting diode, and the receiver is a phototransistor. The input terminals of both the transmitter and the receiver are connected to a high level.

[0013] In one embodiment of the present invention, the photoelectric detection module further includes an NPN transistor Q1 and a detection resistor R16. The emitter output terminal of the photoelectric switch CN2 is connected to the base of the transistor Q1. The collector of the transistor Q1 and the receiver output terminal of the photoelectric switch CN2 are simultaneously connected to one end of the detection resistor R16. The other end of the detection resistor R16 is connected to the microcontroller U1. The emitter of the transistor Q1 is grounded.

[0014] In one embodiment of the present invention, a resistor R15 is connected between the receiver input terminal and the output terminal of the photoelectric switch CN2, and a resistor R10 is connected in series on the collector of the transistor Q1.

[0015] In one embodiment of this utility model, a capacitor C1 is connected in parallel to one end of the detection resistor R16 connected to the microcontroller U1.

[0016] In one embodiment of the present invention, the circuit further includes a door cover detection module and a water level detection module. The door cover detection module uses a door lock switch resistor R34 to detect the open / closed state of the washing machine door cover.

[0017] The water level detection module uses a CMOS inverter chip U2 to detect the water level in the washing machine.

[0018] In one embodiment of this utility model, the load module, power supply module, photoelectric detection module, door cover detection module, and water level detection module are all connected to a microcontroller module.

[0019] As described above, the washing machine imbalance detection circuit of this utility model has the following beneficial effects:

[0020] This invention replaces the traditional impact bar device with a photoelectric detection module, effectively reducing repair costs due to impact bar damage, improving the overall aesthetics of the washing machine, and solving the technical challenge of installing physical detection components on the outer tub wall of a one-piece washing machine, thus expanding its applicability. This invention uses a microcontroller to monitor changes in the on / off state of the photoelectric switch in real time, enabling rapid detection of washing machine swaying with fast response and high accuracy. Upon timely determination of an unbalanced state, the programmable controller can quickly intervene to prevent the machine from tipping over or damaging components, significantly improving user safety. Attached Figure Description

[0021] Figure 1 The circuit diagram shown is that of this utility model.

[0022] Figure 2 Displayed as Figure 1 An enlarged view of the microcontroller module.

[0023] Figure 3 Displayed as Figure 1 Enlarged view of the medium load module.

[0024] Figure 4 Displayed as Figure 1 Enlarged view of the power supply module.

[0025] Figure 5 Displayed as Figure 1 Enlarged view of the Zhongguang Optoelectronic Detection Module.

[0026] Figure 6 Displayed as Figure 1 Enlarged view of the middle door cover detection module and the water level detection module.

[0027] Component designation explanation

[0028] Microcontroller module 1; Load module 2; Power supply module 3; Photoelectric detection module 4; Door cover detection module 5; Water level detection module 6. Detailed Implementation

[0029] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0030] Please see Figures 1-6This utility model provides a washing machine imbalance detection circuit. The detection circuit includes a microcontroller module 1 and a load module 2, a power supply module 3, a photoelectric detection module 4, a door detection module 5, and a water level detection module 6 connected to the microcontroller module 1. The microcontroller module 1 uses a microcontroller U1 to control the operation of the washing machine. The load module 2 uses multiple bidirectional thyristors to control the output of water inlet, motor forward rotation, reverse rotation, and drainage signals during the operation of the washing machine. The power supply module 3 uses a power management chip IC2 to control the power output. The door detection module 5 uses a door lock switch resistor R34 to detect the open / closed state of the washing machine door. The water level detection module 6 uses a CMOS inverter chip U2 to detect the water level of the washing machine, thereby controlling the water inlet and drainage of the washing machine. The photoelectric detection module 4 uses a photoelectric switch CN2, which is mounted on the programmable controller of the washing machine. The presence of imbalance in the washing machine is determined by detecting the open and closed signals of the photoelectric switch CN2.

[0031] Please see Figure 5 Specifically, the photoelectric switch CN2 includes a transmitter and a receiver. The transmitter uses a light-emitting diode (LED), and the receiver uses a phototransistor. The input terminals of both the transmitter and receiver are connected to a high level. The photoelectric detection module 4 also includes an NPN transistor Q1 and a detection resistor R16. The transmitter output terminal of the photoelectric switch CN2 is connected to the base of transistor Q1. The collector of transistor Q1 and the receiver output terminal of the photoelectric switch CN2 are simultaneously connected to one end of the detection resistor R16. The other end of the detection resistor R16 is connected to the microcontroller U1, and the emitter of transistor Q1 is grounded. When the washing machine is running stably, the entire machine only experiences slight shaking, and the programmable controller can maintain a relatively stable state. The photoelectric switch CN2 mounted on the programmable controller... 2. The system can remain relatively stably disconnected. In this state, the transmitter's input and output terminals output low levels, triggering transistor Q1 to operate. The microcontroller U1 detects a low level at the detection resistor R16, indicating that the washing machine is operating stably. When the washing machine is running unstably, the program controller will shake. The photoelectric switch CN2 mounted on the program controller will follow the shaking, triggering the photoelectric switch to conduct internally. At this time, the receiver's input and output terminals will operate, and the microcontroller U1 will detect a high level at the detection resistor R16, indicating that the washing machine is operating unbalancedly. By detecting the signal changes generated by the photoelectric switch being open / closed, the microcontroller U1 determines whether the entire machine is operating unbalancedly, allowing the program controller to intervene in a timely manner and avoid the risk of the entire machine being impacted and tipped over.

[0032] This invention replaces the traditional impact bar device with a photoelectric detection module 4, effectively reducing repair costs due to impact bar damage, improving the overall aesthetics of the washing machine, and solving the technical challenge of installing physical detection components on the outer tub wall of a one-piece washing machine, thus expanding its applicability. This invention uses a microcontroller U1 to detect changes in the on / off state signal of the photoelectric switch in real time, enabling rapid detection of washing machine swaying with fast response and high accuracy. Upon timely determination of an unbalanced state, the programmable controller can quickly intervene, such as pausing operation or adjusting the speed, to prevent the machine from tipping over or damaging components, significantly improving user safety.

[0033] A resistor R15 is connected between the receiver input and output terminals of the photoelectric switch CN2, and a resistor R10 is connected in series with the collector of the transistor Q1. Both resistors R15 and R10 are used to divide the voltage when the transistor Q1 is triggered by a low level. A capacitor C1 is connected in parallel with one end of the detection resistor R16 connected to the microcontroller U1. In the circuit used for voltage detection in the PLC, after voltage division by resistors R15 and R10, connecting a capacitor C1 in parallel with the detection resistor R16 can effectively filter out interference signals, protect the microcontroller U1 from interference, and improve detection stability.

[0034] In summary, this invention achieves non-contact detection of washing machine imbalance through photoelectric detection technology, solving the installation limitations of traditional physical impact devices. It is applicable to both whole-machine and non-whole-machine washing machine operation detection, as well as detection of washing machine imbalance caused by collisions between the inner and outer tubs. Its wide range of applications provides a reliable guarantee for the safe operation of washing machines. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and has high industrial application value.

[0035] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A washing machine imbalance detection circuit, characterized in that, The detection circuit includes: The microcontroller module uses a microcontroller U1 to control the operation of the washing machine. The load module uses multiple bidirectional thyristors, which are used to control the water inlet, motor forward rotation, reverse rotation, and drainage signal output during the operation of the washing machine. The power module uses a power management chip IC2 to control the power output; The photoelectric detection module uses a photoelectric switch CN2 to determine whether the washing machine is operating unbalanced by detecting the open and closed signals of the photoelectric switch CN2.

2. The washing machine imbalance detection circuit according to claim 1, characterized in that: The photoelectric switch CN2 includes a transmitter and a receiver. The transmitter uses a light-emitting diode, and the receiver uses a phototransistor. The input terminals of both the transmitter and the receiver are connected to a high level.

3. The washing machine imbalance detection circuit according to claim 2, characterized in that: The photoelectric detection module also includes an NPN transistor Q1 and a detection resistor R16. The emitter output terminal of the photoelectric switch CN2 is connected to the base of the transistor Q1. The collector of the transistor Q1 and the receiver output terminal of the photoelectric switch CN2 are connected to one end of the detection resistor R16. The other end of the detection resistor R16 is connected to the microcontroller U1. The emitter of the transistor Q1 is grounded.

4. The washing machine imbalance detection circuit according to claim 3, characterized in that: A resistor R15 is connected between the receiver input and output terminals of the photoelectric switch CN2, and a resistor R10 is connected in series with the collector of the transistor Q1.

5. The washing machine imbalance detection circuit according to claim 3, characterized in that: A capacitor C1 is connected in parallel to one end of the detection resistor R16 that is connected to the microcontroller U1.

6. The washing machine imbalance detection circuit according to claim 1, characterized in that: The circuit also includes a door cover detection module and a water level detection module. The door cover detection module uses a door lock switch resistor R34 to detect the open / closed state of the washing machine door cover. The water level detection module uses a CMOS inverter chip U2 to detect the water level in the washing machine.

7. The washing machine imbalance detection circuit according to claim 6, characterized in that: The load module, power supply module, photoelectric detection module, door cover detection module, and water level detection module are all connected to a microcontroller module.

Images