Dish-washing machine control circuit

Abstract

The utility model discloses a dish-washing machine control circuit which comprises an induced magnet, a magnetic field detection module and a main control module, the induced magnet is used for providing a changing magnetic field, and the magnetic field detection module is used for detecting the changing magnetic field and outputting a pressing detection signal or a working mode switching detection signal according to the changing magnetic field. A first signal end of the main control module is connected with a signal output end of the magnetic field detection module, and the main control module is used for outputting a corresponding pressing control signal or a working mode switching control signal according to the pressing detection signal or the working mode switching detection signal so as to control start and stop of the dish-washing machine or switch working modes of the dish-washing machine. According to the control circuit, the magnetic field change of the induction magnet is detected through the magnetic field detection module, so that the start and stop of the dish washing machine can be controlled or the working mode of the dish washing machine can be switched, and compared with a traditional contact switch, the non-contact switch control has the advantages that the mechanical wear to a contact is avoided, and the potential safety hazard of poor contact or short circuit is reduced; and meanwhile, the contact does not need to be replaced, so that the use cost is greatly reduced.

Description

Technical Field

[0002] The utility model relates to the technical field of household electrical appliances, in particular to a control circuit for a dishwasher.

Background Art

[0004] With the continuous improvement of people's living standards, the requirements for the quality of life are also getting higher and higher. As a device for automatically cleaning tableware such as bowls, chopsticks, plates, dishes, knives, forks, etc., dishwashers are widely used in restaurants, hotels, families and other places where various tableware are needed to wash tableware in batches, improving the washing efficiency of tableware.

[0005] Existing dishwashers usually control the start and stop of the dishwasher or the switching of working modes through mechanical coding switches or contact coding switches. However, for mechanical coding switches or contact coding switches, since the contacts need to be frequently operated, the contacts are prone to damage, resulting in potential safety hazards such as poor contact or short circuit; at the same time, since the contacts are prone to frequent damage and need to be frequently replaced, the use cost is high.

Content of the Utility Model

[0007] In order to solve the technical problems of potential safety hazards such as poor contact or short circuit and high use cost that are prone to occur in the application of existing contact coding switches in dishwashers, the utility model proposes a control circuit for a dishwasher.

[0008] The utility model is realized by the following technical solutions:

[0009] A control circuit for a dishwasher, comprising an induction magnet, a magnetic field detection module and a main control module. The induction magnet is used to provide a changing magnetic field. The magnetic field detection module is used to detect the changing magnetic field and output a pressing detection signal or a working mode switching detection signal according to the changing magnetic field. The first signal end of the main control module is connected to the signal output end of the magnetic field detection module. The first control end of the main control module is used to output a pressing control signal according to the pressing detection signal to control the start and stop of the dishwasher. The first control end of the main control module is also used to output a working mode switching control signal according to the working mode switching detection signal to switch the working mode of the dishwasher.

[0010] For a control circuit for a dishwasher as described above, the changing magnetic field includes a magnetic field intensity changing magnetic field and a magnetic pole changing magnetic field. When the magnetic field detection module detects the magnetic field intensity changing magnetic field, it outputs a pressing detection signal. When the magnetic field detection module detects the magnetic pole changing magnetic field, it outputs a working mode switching detection signal.

[0011] A dishwasher control circuit as described above further includes a power board. The power input terminal of the power board is connected to a 5V power supply, and the power output terminals of the power board are respectively connected to the power input terminals of the magnetic field detection module and the main control module; the power board is used to provide a 5V working voltage for the magnetic field detection module and the main control module.

[0012] A dishwasher control circuit as described above, the magnetic field detection module includes a magnetic encoder chip U1, resistors R13, R14, R15, R16, R17, R18, R19, resistors J1 and J2. The enable terminal of the magnetic encoder chip U1 is connected to the power output terminal of the power board. The MODE pin of the magnetic encoder chip U1 is connected to a pull-up resistor J2. The signal output terminal of the magnetic encoder chip U1 is connected to the first signal terminal of the main control module through a series-connected resistor R19. The magnetic zero detection signal terminal of the magnetic encoder chip U1 is connected to a pull-up resistor J1. The magnetic zero detection signal terminal of the magnetic encoder chip U1 is connected to a general-purpose I / O port of the main control module through a series-connected resistor R15. The clock terminal of the magnetic encoder chip U1 is connected to a general-purpose I / O port of the main control module through a series-connected resistor R16. The clock terminal of the magnetic encoder chip U1 is connected to a pull-up resistor R13. The data terminal of the magnetic encoder chip U1 is connected to a general-purpose I / O port of the main control module through a series-connected resistor R17. The data terminal of the magnetic encoder chip U1 is connected to a pull-up resistor R14. The press detection terminal of the magnetic encoder chip U1 is connected through a general-purpose I / O port of the main control module.

[0013] A dishwasher control circuit as described above, the model of the magnetic encoder chip U1 is MT6701.

[0014] A dishwasher control circuit as described above, the main control module includes a main control chip, and the model of the main control chip is CBM7326FLQ2D.

[0015] A dishwasher control circuit as described above, the main control module further includes an emulation programming port, and the emulation programming port is used to burn the compiled program into the main control chip to execute the execution instructions for starting and stopping the dishwasher or switching the working mode.

[0016] A dishwasher control circuit as described above further includes a display module. The input end of the display module is connected to the second control end of the main control module, and the display module is used to display the current working state or fault code of the dishwasher.

[0017] A dishwasher control circuit as described above, the display module includes a 3-digit digital tube LED1, resistors R5, R6, R7, R8, R9, R10, R11, and R12. The common terminal of the 3-digit digital tube LED1 is connected to the second control terminal of the main control module. The A-segment pin of the 3-digit digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R5. The B-segment pin of the 3-digit digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R6. The C-segment pin of the 3-digit digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R7. The D-segment pin of the 3-digit digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R8. The E-segment pin of the 3-digit digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R9. The F-segment pin of the 3-digit digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R10. The G-segment pin of the 3-digit digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R11. The DP pin of the 3-digit digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R12.

[0018] A dishwasher control circuit as described above further includes a communication module. The input end of the communication module is connected to the third control terminal of the main control module. The communication module is used for the connection and communication between the dishwasher and other peripheral devices.

[0019] Compared with the prior art, a dishwasher control circuit proposed by the present utility model has the following beneficial effects:

[0020] 1. For the dishwasher control circuit proposed by the present utility model, by detecting the magnetic field change of the induction magnet through the magnetic field detection module, the start and stop of the dishwasher can be controlled or the working mode of the dishwasher can be switched. This non-contact switch control, compared with the traditional contact switch, avoids mechanical wear of the contacts and reduces potential safety hazards of poor contact or short circuit; at the same time, since the non-contact switch control does not require replacement of contacts, the usage cost is greatly reduced.

[0021] 2. The magnetic field detection module proposed by the present utility model includes a magnetic encoder chip. The magnetic encoder chip is the core component of the non-contact switch. The magnetic encoder chip provides an ABZ output mode, enabling the rapid and accurate acquisition of the rotation angle signal of the dishwasher knob, so that the working mode of the dishwasher can be accurately switched. The magnetic encoder chip can also implement the pressing function of the non-contact knob.

[0022] 3. Maintaining an appropriate interval between the induction magnet and the magnetic encoder chip proposed by the present utility model helps the magnetic encoder chip to stably obtain the magnetic field change of the induction magnet, so as to output stable and reliable detection signals; the induction magnet rotates synchronously with the knob handle, enabling the user to directly change the magnetic field change by operating the knob handle, thereby realizing non-contact pressing and rotating functions, and further realizing controlling the start and stop of the dishwasher and switching the working mode of the dishwasher.

Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments.

[0025] Figure 1 It is the structural block diagram of the present utility model;

[0026] Figure 2 It is the schematic diagram of the magnetic field detection module of the present utility model;

[0027] Figure 3 It is the schematic diagram of the main control module of the present utility model;

[0028] Figure 4 It is the schematic diagram of the display module of the present utility model;

[0029] Figure 5 It is the schematic diagram of the communication module of the present utility model;

[0030] Figure 6 It is the structure diagram of the induction magnet and the magnetic encoder chip of the present utility model.

Detailed Embodiment

[0032] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer, the following will further describe the present utility model in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0033] Specific embodiments are combined with Figures 1 to 6As shown in the figure, the technical solution of the present utility model will be further described. A dishwasher control circuit includes an induction magnet 100, a magnetic field detection module 200, and a main control module 300. The induction magnet 100 is used to provide a magnetic field change signal. The signal input end of the magnetic field detection module 200 is used to detect the magnetic field change signal. The signal output end of the magnetic field detection module 200 is used to output a press detection signal or a gear shift detection signal according to the magnetic field change signal. The first signal end of the main control module 300 is connected to the signal output end of the magnetic field detection module 200. The first control end of the main control module 300 is used to output a press control signal according to the press detection signal to control the start and stop of the dishwasher. The first control end of the main control module 300 is also used to output a gear shift control signal according to the gear shift detection signal to control the gear shift of the dishwasher. By detecting the magnetic field change of the induction magnet 100 through the magnetic field detection module 200, the start and stop of the dishwasher can be controlled or the working mode of the dishwasher can be switched. This non-contact switch control avoids mechanical wear of the contacts compared with the traditional contact switch, reduces potential safety hazards of poor contact or short circuit; at the same time, the non-contact switch control greatly reduces the use cost because there is no need to replace the contacts.

[0034] Further, as a preferred implementation manner of this solution rather than a limitation, the dishwasher control circuit further includes a power supply board 400 (not shown in the figure). A 5V power supply is connected to the power input end of the power supply board 400. The power output end of the power supply board 400 (i.e., the CN1 port of this embodiment) is respectively connected to the power input ends of the magnetic field detection module 200 and the main control module 300. The power supply board 400 is used to provide a 5V working voltage for the magnetic field detection module 200 and the main control module 300.

[0035] In this embodiment, the design of the power supply board can provide a stable 5V working voltage for the magnetic field detection module and the main control module, ensuring that the magnetic field detection module and the main control module can work stably; the design of the power supply board can also protect the internal circuit from the influence of external power grid fluctuations and improve the anti-interference ability of the control circuit.

[0036] Further, as a preferred implementation manner of this solution rather than a limitation, the changing magnetic field includes a magnetic field intensity changing magnetic field and a magnetic pole changing magnetic field. When the magnetic field detection module detects the magnetic field intensity changing magnetic field, it outputs a press detection signal. When the magnetic field detection module detects the magnetic pole changing magnetic field, it outputs a working mode switching detection signal.

[0037] Further, as a preferred implementation manner rather than a limitation of this solution, the magnetic field detection module 200 includes a magnetic encoder chip U1, resistors R13, R14, R15, R16, R17, R18, R19, J1 and J2. The enable terminal of the magnetic encoder chip U1 is connected to the power output terminal of the power supply board (i.e., the CN1 port in this embodiment). The MODE pin of the magnetic encoder chip U1 is connected to a pull-up resistor J2. The signal output terminal (i.e., the OUT pin) of the magnetic encoder chip U1 is connected to the first signal terminal of the main control module (in this embodiment, the P31 pin is selected) through the serially connected resistor R19. The magnetic zero detection signal terminal (i.e., the Z pin) of the magnetic encoder chip U1 is connected to a pull-up resistor J1. The magnetic zero detection signal terminal (i.e., the Z pin) of the magnetic encoder chip U1 is connected to a general-purpose I / O port of the main control module (in this embodiment, the P37 pin is selected) through the serially connected resistor R15. The clock terminal (i.e., the SCL pin) of the magnetic encoder chip U1 is connected to a general-purpose I / O port of the main control module (in this embodiment, the P36 pin is selected) through the serially connected resistor R16. The clock terminal (i.e., the SCL pin) of the magnetic encoder chip U1 is connected to a pull-up resistor R13. The data terminal (i.e., the SDA pin) of the magnetic encoder chip U1 is connected to a general-purpose I / O port of the main control module (in this embodiment, the P34 pin is selected) through the serially connected resistor R17. The data terminal (i.e., the SDA pin) of the magnetic encoder chip U1 is connected to a pull-up resistor R14. The press detection terminal (i.e., the PUSH pin) of the magnetic encoder chip U1 is connected through a general-purpose I / O port of the main control module (in this embodiment, the P33 pin is selected).

[0038] In this embodiment, the magnetic encoder chip is the core component of the non-contact switch, which can realize non-contact pressing or rotation functions. Compared with the contact switch, the non-contact switch avoids mechanical wear of the contacts, thereby improving the reliability of the control system and extending the service life of the device; at the same time, the non-contact switch is not affected by external environmental factors, avoiding potential safety hazards caused by poor contact or short circuit;

[0039] Among them, the MODE pin of the magnetic encoder chip can select output modes such as ABZ, UVW, analog signal, and PWM, providing flexibility to adapt to various application scenarios. In this embodiment, the ABZ incremental output mode is selected. The ABZ incremental output mode provides two-phase signals A and B, and a zero position signal Z. Since the phase difference between the A signal and the B signal is 90°, the ABZ incremental output mode can accurately identify the rotation direction of the knob, so that the working mode of the dishwasher can be accurately switched;

[0040] In addition, the PUSH pin of the magnetic encoder chip can detect rapid changes in the distance between the induction magnet and the magnetic encoder chip, realizing a non-contact button function, thereby enabling the start and stop of the dishwasher. Among them:

[0041] When the distance is closer, the magnetic field intensity is greater, the PUSH pin is at a high level, and a pressing detection signal is output; when the distance is farther, the magnetic field intensity is smaller, and the PUSH pin is at a low level.

[0042] Furthermore, as a preferred implementation manner of this solution rather than a limitation, the model of the magnetic encoder chip U1 is MT6701. Specifically, in implementation, the model of the magnetic encoder chip U1 can also be replaced by a magnetic encoder chip of the KTH57 series or other models.

[0043] In this embodiment, the magnetic encoder chip MT6701 is an angular position sensor chip based on the differential horizontal Hall magnetic induction principle. The MT6701 provides an ABZ output mode, enabling the rapid and accurate acquisition of the rotation angle signal of the dishwasher knob, thereby enabling the precise switching of the dishwasher's working mode. The MT6701 can also implement the pressing function of a non-contact knob.

[0044] Furthermore, as a preferred implementation manner of this solution rather than a limitation, the induction magnet 100 is concentrically arranged with the magnetic encoder chip U1. The interval between the induction magnet 100 and the magnetic encoder chip U1 is 0.5 mm - 2 mm. The thickness of the induction magnet 100 is 2.5 mm. The induction magnet 100 can be a cylindrical neodymium iron boron magnet or a cylindrical samarium cobalt magnet;

[0045] Specifically, the induction magnet 100 is fixed at the bottom of the knob handle (not shown in the figure) and rotates synchronously with the knob handle.

[0046] In this embodiment, maintaining an appropriate interval between the induction magnet and the magnetic encoder chip helps the magnetic encoder chip to stably acquire the magnetic field change of the induction magnet, thereby enabling the output of stable and reliable detection signals; the induction magnet rotates synchronously with the knob handle, enabling the user to directly change the magnetic field change by operating the knob handle, thereby realizing non-contact pressing and rotation functions, and further realizing the start and stop of the dishwasher and the switching of the dishwasher's working mode.

[0047] Furthermore, as a preferred implementation manner of this solution rather than a limitation, the main control module 300 includes a main control chip IC1. The model of the main control chip IC1 is CBM7326FLQ2D. Specifically, in implementation, the model of the main control chip IC1 can also be replaced by other models of main control chips.

[0048] In this embodiment, the main control chip CBM7326FLQ2D is an 8-bit single-chip microcomputer based on 8051 instructions and with an A / D type touch key with LED drive function. The CBM7326FLQ2D can adjust the touch sensitivity, enabling more accurate switching of the dishwasher's working mode or control of the dishwasher's start and stop. The CBM7326FLQ2D also has functions of electrostatic protection, code protection, in-circuit serial programming, and in-circuit debugging.

[0049] Further, as a preferred implementation manner of this solution rather than a limitation, the main control module 300 further includes an emulation programming port CN2, which is used to burn the compiled program into the main control chip IC1 to execute the execution instructions for starting and stopping the dishwasher or switching the working mode.

[0050] Specifically, the emulation programming port CN2 is connected to the program debugging serial port of the main control chip (i.e., P00 and P01 pins).

[0051] In this embodiment, the emulation programming port can facilitate the update of the program of the main control chip, enabling the execution instructions for starting and stopping the dishwasher or switching gears to be flexibly modified and optimized; when the dishwasher fails due to a program bug, technicians can quickly reprogram it or restore it to the factory settings through the emulation programming port, thereby reducing the maintenance time and cost.

[0052] Further, as a preferred implementation manner of this solution rather than a limitation, the main control module 300 can also add registers, which are used to store and call the control program of the dishwasher. The registers can be implemented using non-volatile registers such as EEPROM, Flash, and FRAM.

[0053] Further, as a preferred implementation manner of this solution rather than a limitation, the dishwasher control circuit further includes a display module 500. The signal input end of the display module 500 is connected to the second signal output end of the main control module 300, and the display module 500 is used to display the current working state or fault code of the dishwasher.

[0054] Further, as a preferred implementation manner rather than a limitation of this solution, the display module 500 includes a 3-digit LED display LED1, resistors R5, R6, R7, R8, R9, R10, R11, and R12. The common terminal of the 3-digit LED display LED1 is connected to the second signal output terminal of the main control module. The A-segment pin of the 3-digit LED display LED1 is connected to a general-purpose I / O port of the main control module (in this embodiment, the P42 pin is selected) through the serially connected resistor R5. The B-segment pin of the 3-digit LED display LED1 is connected to a general-purpose I / O port of the main control module (in this embodiment, the P43 pin is selected) through the serially connected resistor R6. The C-segment pin of the 3-digit LED display LED1 is connected to a general-purpose I / O port of the main control module (in this embodiment, the P44 pin is selected) through the serially connected resistor R7. The D-segment pin of the 3-digit LED display LED1 is connected to a general-purpose I / O port of the main control module (in this embodiment, the P45 pin is selected) through the serially connected resistor R8. The E-segment pin of the 3-digit LED display LED1 is connected to a general-purpose I / O port of the main control module (in this embodiment, the P20 pin is selected) through the serially connected resistor R9. The F-segment pin of the 3-digit LED display LED1 is connected to a general-purpose I / O port of the main control module (in this embodiment, the P17 pin is selected) through the serially connected resistor R10. The G-segment pin of the 3-digit LED display LED1 is connected to a general-purpose I / O port of the main control module (in this embodiment, the P21 pin is selected) through the serially connected resistor R11. The DP pin of the 3-digit LED display LED1 is connected to a general-purpose I / O port of the main control module (in this embodiment, the P22 pin is selected) through the serially connected resistor R12.

[0055] In this embodiment, the display module displays the current working state of the dishwasher, such as the current washing gear of the dishwasher, through a 3-digit LED display, improving the interaction between the user and the dishwasher. The display module can also display a fault code through the 3-digit LED display, enabling the user to intuitively and quickly identify the fault state of the dishwasher, so as to take corresponding treatment measures and avoid further damage to the dishwasher caused by the user's misunderstanding or misoperation.

[0056] Further, as a preferred implementation manner rather than a limitation of this solution, the dishwasher control circuit further includes a communication module 600. The signal input terminal of the communication module 600 is connected to the third signal output terminal of the main control module 300. The communication module 600 is used for the connection and communication between the dishwasher and other peripheral devices.

[0057] In this embodiment, the design of the communication module can enable the dishwasher to connect and communicate with other devices, thereby improving the intelligence level and user experience of the dishwasher; through the communication module, it is also possible to remotely control the start and stop of the dishwasher or switch the working mode of the dishwasher. For example, the dishwasher can be connected to a smartphone or other network device for communication to achieve the remote control function.

[0058] In this embodiment, the working principle of the main control module to control the start and stop of the dishwasher or switch the working mode of the dishwasher according to the magnetic field change signal is as follows:

[0059] The principle of switching the working mode of the dishwasher is as follows: when the knob handle rotates, the induction magnet rotates synchronously with the knob handle. Due to the distribution of the north and south poles on the induction magnet, the induction magnet and the magnetic encoder chip will generate a change in magnetic poles (i.e., an angle change). The main control chip reads the magnetic pole change signal, that is, the rotation angle of the induction magnet, through the SCL pin and SDA pin of the magnetic encoder chip, so as to control the gear switching of the dishwasher;

[0060] Among them, in this embodiment, the working modes of the dishwasher are divided into three gears: high, medium, and low. When switching between each working mode, the rotation angle of the knob handle is between 30° and 40°. That is, when switching from the low gear to the medium gear, the knob handle needs to rotate an angle of 30° - 40° so that the main control chip can clearly read the magnetic pole change signal through the SCL pin and SDA pin of the magnetic encoder chip, thereby achieving the switch to the medium gear. Similarly, the same is true when switching to the high gear.

[0061] After the working mode of the dishwasher is selected, press the knob handle to start the dishwasher for washing. The specific process is as follows: when the knob handle is pressed, the induction magnet will be pressed synchronously. At this time, the distance between the induction magnet and the magnetic encoder chip becomes smaller, the magnetic field strength increases, and the PUSH pin of the magnetic encoder chip outputs a high level. Thus, the main control chip receives the high-level signal and then controls the dishwasher to start washing until the washing is completed;

[0062] If it is necessary to stop the washing work of the dishwasher during the process, press the knob handle again to drive the induction magnet away from the magnetic encoder chip. At this time, the distance between the induction magnet and the magnetic encoder chip becomes larger, the magnetic field strength decreases, and the PUSH pin of the magnetic encoder chip outputs a low level. Thus, the main control chip receives the low-level signal and then controls the dishwasher to stop washing.

[0063] Those of ordinary skill in the art should understand that the above description provides an implementation manner in combination with specific content, and it is not considered that the specific implementation of the present utility model is limited only to these descriptions. At the same time, due to different industry names, it is not limited to the above names or English names. Any method, structure, etc. that is similar or identical to the present utility model, or any technical deduction or substitution made under the premise of the concept of the present utility model, should be regarded as within the protection scope of the present utility model.

Claims

1. A dishwasher control circuit, characterized in that, Comprising: An induction magnet for providing a changing magnetic field; A magnetic field detection module for detecting the changing magnetic field and outputting a press detection signal or a working mode switching detection signal according to the changing magnetic field; A main control module, wherein a first signal end of the main control module is connected to a signal output end of the magnetic field detection module, a first control end of the main control module is used for outputting a press control signal according to the press detection signal to control the start and stop of the dishwasher, and the first control end of the main control module is further used for outputting a working mode switching control signal according to the working mode switching detection signal to switch the working mode of the dishwasher.

2. The dishwasher control circuit according to claim 1, wherein, The changing magnetic field includes a magnetic field intensity changing magnetic field and a magnetic pole changing magnetic field. When the magnetic field detection module detects the magnetic field intensity changing magnetic field, it outputs a press detection signal. When the magnetic field detection module detects the magnetic pole changing magnetic field, it outputs a working mode switching detection signal.

3. The control circuit of a dishwasher according to claim 1, wherein, It further includes a power supply board. A 5V power supply is connected to a power input end of the power supply board. A power output end of the power supply board is respectively connected to a power input end of the magnetic field detection module and a power input end of the main control module. The power supply board is used for providing a 5V working voltage for the magnetic field detection module and the main control module.

4. A dishwasher control circuit according to claim 1, characterized in that, The magnetic field detection module includes a magnetic encoder chip U1, resistors R13, R14, R15, R16, R17, R18, R19, resistor J1 and resistor J2. An enable end of the magnetic encoder chip U1 is connected to a power output end of the power supply board. A MODE pin of the magnetic encoder chip U1 is connected to a pull-up resistor J2. A signal output end of the magnetic encoder chip U1 is connected to a first signal end of the main control module through a series-connected resistor R19. A magnetic zero detection signal end of the magnetic encoder chip U1 is connected to a pull-up resistor J1. The magnetic zero detection signal end of the magnetic encoder chip U1 is connected to a general-purpose I / O port of the main control module through a series-connected resistor R15. A clock end of the magnetic encoder chip U1 is connected to a general-purpose I / O port of the main control module through a series-connected resistor R16. The clock end of the magnetic encoder chip U1 is connected to a pull-up resistor R13. A data end of the magnetic encoder chip U1 is connected to a general-purpose I / O port of the main control module through a series-connected resistor R17. The data end of the magnetic encoder chip U1 is connected to a pull-up resistor R14. A press detection end of the magnetic encoder chip U1 is connected through a general-purpose I / O port of the main control module.

5. A dishwasher control circuit according to claim 4, characterized in that, The model of the magnetic encoder chip U1 is MT6701.

6. The control circuit of a dishwasher according to claim 1, wherein The main control module includes a main control chip, and the model of the main control chip is CBM7326FLQ2D.

7. The dishwasher control circuit according to claim 6, wherein The main control module further includes an emulation programming port for programming the compiled program into the main control chip to execute the execution instructions for the start and stop of the dishwasher or the switching of the working mode.

8. The control circuit of a dishwasher according to claim 1, characterized in that, It further includes a display module. An input end of the display module is connected to a second control end of the main control module. The display module is used for displaying the current working state or fault code of the dishwasher.

9. The dishwasher control circuit according to claim 8, characterized in that, The display module includes a 3-digit LED digital tube LED1, resistors R5, R6, R7, R8, R9, R10, R11, and R12. The common terminal of the 3-digit LED digital tube LED1 is connected to the second control terminal of the main control module. The A-segment pin of the 3-digit LED digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R5. The B-segment pin of the 3-digit LED digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R6. The C-segment pin of the 3-digit LED digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R7. The D-segment pin of the 3-digit LED digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R8. The E-segment pin of the 3-digit LED digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R9. The F-segment pin of the 3-digit LED digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R10. The G-segment pin of the 3-digit LED digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R11. The DP pin of the 3-digit LED digital tube LED1 is connected to a general-purpose I / O port of the main control module through the serially connected resistor R12.

10. A dishwasher control circuit according to claim 1, characterized in that, It further includes a communication module. The input terminal of the communication module is connected to the third control terminal of the main control module. The communication module is used for the connection and communication between the dishwasher and other peripheral devices.

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