A control circuit for a low-power washing machine

Abstract

The utility model provides a control circuit of a low-power washing machine, comprising an inlet and outlet motor unit, a main control unit, a motor drive unit connected to the motor, and a power supply unit for providing power to each unit, wherein the main control unit is connected to the inlet and outlet unit and the motor drive unit respectively, wherein the motor drive unit comprises a first field effect transistor, a second field effect transistor, a third field effect transistor and a fourth field effect transistor, and the first field effect transistor, the second field effect transistor, the third field effect transistor and the fourth field effect transistor form an H bridge; the beneficial effects of the utility model are as follows: the utility model adopts a low-power motor drive unit, and the motor drive unit adopts four NMOS to form an H bridge, and different control effects on the motor are achieved by controlling the conduction and cutoff of the four NMOS tubes, and the current detection provided in the motor drive unit can prevent the motor from burning out when the motor is overloaded.

Description

Technical Field

[0001] The utility model relates to the technical field of washing machines, in particular to a control circuit of a low-power washing machine. Background Art

[0002] A washing machine is a machine for washing clothes. It is a cleaning appliance that uses electrical energy to generate mechanical action to wash clothes. It is divided into two categories: household and collective use according to its rated washing capacity. However, most of the existing washing machines are of high power and have high limitations, making them inconvenient to promote and use. With the diversification of household washing machines, especially for washing baby clothes, low-power washing machines are needed to wash baby clothes. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a control circuit for a low-power washing machine, so as to solve the problem that most washing machines in the prior art have high power and high limitations.

[0004] In order to achieve the above purpose and other related purposes, the utility model provides the following technical solutions:

[0005] A control circuit for a low-power washing machine includes an inlet and outlet motor unit, a main control unit, a motor drive unit connected to the motor, and a power supply unit for providing power to each unit, wherein the main control unit is connected to the inlet and outlet unit and the motor drive unit, respectively, wherein the motor drive unit includes a first field effect transistor, a second field effect transistor, a third field effect transistor, and a fourth field effect transistor, wherein the first field effect transistor, the second field effect transistor, the third field effect transistor, and the fourth field effect transistor form an H bridge, and the power supply unit includes a power supply chip for providing a DC power supply to the motor drive unit.

[0006] In one embodiment of the utility model, it also includes a disinfection unit, a water electrolysis unit, a water level detection unit, a reminder unit and a display interface unit, and the main control unit is respectively connected to the disinfection unit, the water electrolysis unit, the water level detection unit, the reminder unit and the display interface unit.

[0007] In one embodiment of the utility model, the main control unit includes a main control chip, four control ends of the main control chip are connected to the water inlet and outlet unit, two control ends of the main control chip are connected to the motor drive unit, three control ends of the main control chip are connected to the disinfection unit, the control end of the main control chip is connected to the water electrolysis unit, the control end of the main control chip is connected to the water level detection unit, two control ends of the main control chip are connected to the reminder unit, and the control end of the main control chip is connected to the display interface unit.

[0008] In one embodiment of the utility model, the water inlet and outlet motor unit includes a water inlet motor module and a drainage motor module, and the water inlet motor module and the drainage motor module are both connected to the main control unit; the water inlet motor module includes a fifth field effect transistor and a third resistor, and the gate of the fifth field effect transistor is connected to the main control unit through the third resistor; the drainage motor module includes a drainage motor control chip and a fifteenth resistor, two control ends of the drainage motor control chip are connected to the main control unit, and the control end of the drainage motor control chip is connected to the main control unit through the fifteenth resistor.

[0009] In one embodiment of the utility model, the motor drive unit also includes a first transistor, a second transistor, a twenty-second resistor, a twenty-third resistor, a twenty-eighth resistor and a thirty-second resistor. The base of the second transistor is connected to the main control unit through the twenty-second resistor and the twenty-third resistor, the source of the third field effect transistor and the fourth field effect transistor is connected to the main control unit through the thirty-second resistor, and the gate of the fourth field effect transistor is connected to the main control unit through the twenty-eighth resistor.

[0010] In one embodiment of the utility model, the power supply unit also includes a fourteenth capacitor, a first electrolytic capacitor, a magnetic core inductor, a second electrolytic capacitor and a fifteenth capacitor, the first pin of the power chip is respectively connected to the positive electrode of the fourteenth capacitor, the positive electrode of the first electrolytic capacitor and the second voltage source, wherein the voltage of the second voltage source is 12V, the fourth pin of the power chip and the second pin of the magnetic core inductor are both connected to the positive electrode of the second electrolytic capacitor, the positive electrode of the fifteenth capacitor and the third voltage source, wherein the voltage of the third voltage source is 5V.

[0011] In one embodiment of the utility model, the disinfection unit includes an ozone module and a blue light module, both of which are connected to the main control unit; the disinfection unit includes a sixth field effect tube and a sixth resistor, and the gate of the sixth field effect tube is connected to the main control unit through the sixth resistor; the blue light module includes a seventh field effect tube, an eighth field effect tube, a forty-eighth resistor and a forty-ninth resistor, and the gate of the seventh field effect tube is connected to the main control unit through the forty-ninth resistor; the gate of the eighth field effect tube is connected to the main control unit through the forty-eighth resistor.

[0012] In one embodiment of the utility model, the water electrolysis unit includes a ninth field effect transistor and a seventh resistor, and the gate of the ninth field effect transistor is connected to the main control unit through the seventh resistor; the water level detection unit includes a water level detection chip and a forty-seventh resistor, and the control end of the water level detection chip is connected to the main control unit through the forty-seventh resistor; the reminder unit includes a third transistor, a fifth transistor, an eighth resistor and a seventeenth resistor, the base of the third transistor is connected to the main control unit through the eighth resistor, and the base of the fifth transistor is connected to the main control unit through the seventeenth resistor; the display interface unit includes a ninth connector, and the first pin of the ninth connector is connected to the main control unit.

[0013] As described above, the control circuit of a low-power washing machine of the utility model has the following beneficial effects:

[0014] The utility model adopts a low-power motor drive unit, and the motor drive unit adopts four NMOS to form an H-bridge. Different control effects on the motor are achieved by controlling the conduction and cutoff of the four NMOS tubes. The current detection in the motor drive unit can prevent the motor from burning out when the motor is overloaded. The power supply unit in the utility model can provide 12V and 5V DC power supplies to each unit through a power supply chip, so that the limitations of the washing machine are relatively small and it is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is the overall structural block diagram disclosed in the embodiment of the utility model;

[0016] Figure 2 The display is a schematic diagram of the main control unit circuit disclosed in the embodiment of the utility model;

[0017] Figure 3 Shown is a circuit schematic diagram of a water inlet motor module disclosed in an embodiment of the utility model;

[0018] Figure 4 Shown is a circuit schematic diagram of a drainage motor module disclosed in an embodiment of the utility model;

[0019] Figure 5 Shown is a circuit schematic diagram of a motor drive unit disclosed in an embodiment of the utility model;

[0020] Figure 6 Shown is a schematic diagram of a power supply unit circuit disclosed in an embodiment of the utility model;

[0021] Figure 7 Shown is a circuit schematic diagram of an ozone module disclosed in an embodiment of the utility model;

[0022] Figure 8The display is a schematic diagram of the blue light module circuit disclosed in the embodiment of the utility model;

[0023] Fig. 9 Shown is a schematic diagram of the water electrolysis unit circuit disclosed in the embodiment of the utility model;

[0024] Fig.10 Shown is a circuit schematic diagram of a water level detection unit disclosed in an embodiment of the utility model;

[0025] Fig.11 Shown is a schematic diagram of the reminder unit circuit disclosed in the embodiment of the utility model;

[0026] Fig.12 Shown is a schematic diagram of a circuit diagram of a display interface unit disclosed in an embodiment of the present utility model. DETAILED DESCRIPTION

[0027] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0028] See also Figure 1 The utility model provides a control circuit for a low-power washing machine, including a main control unit, a water inlet and outlet motor unit, a motor drive unit and a power supply unit for providing power to each unit, and also includes a disinfection unit, a water electrolysis unit, a water level detection unit, a reminder unit and a display interface unit.

[0029] See also Figure 2 The main control unit includes a main control chip and other components. In this embodiment, the model of the main control chip is APT32F1023. The main control chip U1 is selected as an example for explanation below.

[0030] The sixth to eighth pins and the seventeenth pin of the main control chip U1 are four of the control terminals, the sixth to eighth pins and the seventeenth pin of the main control chip U1 are all connected to the water inlet and outlet unit, the fifteenth and sixteenth pins of the main control chip U1 are two of the control terminals, the fifteenth and sixteenth pins of the main control chip U1 are all connected to the motor drive unit, the fifth, ninth and twelfth pins of the main control chip U1 are three of the control terminals, the fifth, ninth and twelfth pins of the main control chip U1 are all connected to the disinfection unit, the eighteenth pin of the main control chip U1 is one of the control terminals, the main chip The eighteenth pin of U1 is connected to the water electrolysis unit, the fourth pin of the main control chip U1 is one of the control ends, the fourth pin of the main control chip U1 is connected to the water level detection unit, the thirteenth pin and the fourteenth pin of the main control chip U1 are two of the control ends, the thirteenth pin and the fourteenth pin of the main control chip U1 are both connected to the reminder unit, the eleventh pin of the main control chip U1 is one of the control ends, and the eleventh pin of the main control chip U1 is connected to the display interface unit, wherein the main control unit can control the water inlet and outlet motor unit, the motor drive unit, the water electrolysis unit, the water level detection unit, the reminder unit and the display interface unit.

[0031] See also Figure 1 The water inlet and outlet motor unit includes a water inlet motor module and a water outlet motor module.

[0032] See also Figure 3 and Figure 4 The water inlet motor module includes a first connector, a fifth field effect transistor and other components, and the drainage motor module includes a drainage motor control chip, a second connector and other components. In this embodiment, the model of the drainage motor control chip is RZ7888. The first connector CN1, the fifth field effect transistor Q1, the drainage motor control chip IC2 and the second connector CN4 are selected as examples for explanation.

[0033] The gate of the fifth field effect transistor Q1 is connected to the main control unit through the third resistor R3, the gate of the fifth field effect transistor Q1 is connected to the drain of the fifth field effect transistor Q1 through the ninth resistor R9 and is grounded, the source of the fifth field effect transistor Q1 is respectively connected to the first pin of the first connector CN1 and the positive electrode of the first diode D1, the cathode of the first diode D1 is connected to the first voltage source and the second pin of the first connector CN1, wherein the first connector CN1 is also connected to the water inlet motor;

[0034] The first pin and the second pin of the drainage motor control chip IC2 are both connected to the main control unit, the third pin of the drainage motor control chip IC2 is connected to the main control unit through the fifteenth resistor R15, the fifth pin and the sixth pin of the drainage motor control chip IC2 are connected to the second pin of the second connector CN4, the fifth pin and the sixth pin of the drainage motor control chip IC2 are also connected to one end of the second capacitor C2, the seventh pin and the eighth pin of the drainage motor control chip IC2 are connected to the first pin of the second connector CN4, the seventh pin and the eighth pin of the drainage motor control chip IC2 are also connected to the other end of the second capacitor C2 through the twelfth resistor R12, wherein the second connector CN4 is also connected to the drainage motor.

[0035] See also Figure 5 The motor drive unit includes a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a first transistor, a second transistor, a third connector and other components. The first field effect transistor Q8, the second field effect transistor Q7, the third field effect transistor Q12, the fourth field effect transistor Q11, the first transistor Q10, the second transistor Q9 and the third connector CN5 are selected as examples for explanation.

[0036] The gate of the first field effect transistor Q8 is connected to the collector of the first transistor Q10 through the twenty-first resistor R21, the base of the first transistor Q10 is connected to the gate of the fourth field effect transistor Q11 through the twenty-fourth resistor R24, the drain of the first field effect transistor Q8 is connected to the third connector CN5 and the drain of the third field effect transistor Q12, the gate of the second field effect transistor Q7 is connected to the collector of the second transistor Q9 through the twentieth resistor R20, the base of the second transistor Q9 is connected to the main control unit through the twenty-second resistor R22 and the twenty-third resistor R23, and the second field effect transistor Q The drain of 7 is connected to the drain of the third connector CN5 and the fourth field effect transistor Q11, the source of the third field effect transistor Q12 and the fourth field effect transistor Q11 is connected to the main control unit through the thirty-second resistor R32, and the gate of the fourth field effect transistor Q11 is connected to the main control unit through the twenty-eighth resistor R28, wherein the motor drive unit adopts four NMOS to form an H bridge, and different control effects on the motor are achieved by controlling the conduction and cutoff of the four NMOS tubes, and the current detection in the motor drive unit can prevent the motor from burning out when the motor is overloaded.

[0037] See also Figure 6 The power supply unit includes a power supply chip and other components. In this embodiment, the model of the power supply chip is AP2301. The power supply chip IC1 is selected as an example for explanation below.

[0038] The first pin of the power chip IC1 is respectively connected to the positive electrode of the fourteenth capacitor C14, the positive electrode of the first electrolytic capacitor E1 and the second voltage source, wherein the voltage of the second voltage source is 12V, the fourth pin of the power chip IC1 is connected to the second pin of the core inductor L1, the fifth pin of the power chip IC1 is connected to the first pin of the core inductor L1, the fourth pin of the power chip IC1 and the second pin of the core inductor L1 are both connected to the positive electrode of the second electrolytic capacitor E2, the positive electrode of the fifteenth capacitor C15 and the third voltage source, wherein the voltage of the third voltage source is 5V, and one of the pins of the power chip IC1 is respectively connected to the negative electrode of the fourteenth capacitor C14, the negative electrode of the first electrolytic capacitor E1, the negative electrode of the second electrolytic capacitor E2 and the negative electrode of the fifteenth capacitor C15 and grounded, wherein the power supply unit can provide 12V and 5V DC power supplies for each unit.

[0039] See also Figure 1 , the disinfection unit includes an ozone module and a blue light module.

[0040] See also Figure 7 and Figure 8 The disinfection unit includes a sixth field effect transistor, a fourth connector and other components, and the blue light module includes a seventh field effect transistor, a fifth connector, an eighth field effect transistor, a sixth connector and other components. The sixth field effect transistor Q3, the fourth connector CN2, the seventh field effect transistor Q14, the fifth connector CN8, the eighth field effect transistor Q13 and the sixth connector CN7 are selected as examples for explanation.

[0041] The gate of the sixth field effect transistor Q3 is connected to the main control unit through the sixth resistor R6, the source of the sixth field effect transistor Q3 is connected to the positive electrode of the second diode D2 and the first pin of the fourth connector CN2 respectively, and the second pin of the fourth connector CN2 is connected to the negative electrode of the second diode D2 and the fourth voltage source respectively; the gate of the seventh field effect transistor Q14 is connected to the main control unit through the forty-ninth resistor R49; the source of the seventh field effect transistor Q14 is connected to the first pin of the fifth connector CN8 through the forty-fourth resistor R44 and the thirty-sixth resistor R36, and the second pin of the fifth connector CN8 is connected to the fifth voltage source, the gate of the eighth field effect transistor Q13 is connected to the main control unit through the forty-eighth resistor R48, the source of the eighth field effect transistor Q13 is connected to the first pin of the sixth connector CN7 through the forty-first resistor R41 and the thirty-fourth resistor R34, and the second pin of the sixth connector CN7 is connected to the sixth voltage source, wherein the ozone module and the blue light module are used to sterilize and disinfect the clothes in the washing machine.

[0042] See also Figures 9 to 12The water electrolysis unit includes a ninth field effect transistor, a seventh connector and other components, the water level detection unit includes a water level detection chip, an eighth connector and other components, the reminder unit includes a third transistor, a fourth transistor, a fifth transistor, a buzzer and other components, and the display interface unit includes a ninth connector and other components. The ninth field effect transistor Q4, the seventh connector CN3, the water level detection chip U2, the eighth connector CN10, the third transistor Q5, the fourth transistor Q2, the fifth transistor Q6, the buzzer BZ1 and the ninth connector CN6 are selected as examples for explanation.

[0043] The gate of the ninth field effect transistor Q4 is connected to the main control unit through the seventh resistor R7, the source of the ninth field effect transistor Q4 is respectively connected to the anode of the third diode D3 and the first pin of the seventh connector CN3, and the second pin of the seventh connector CN3 is respectively connected to the cathode of the third diode D3 and the seventh voltage source, wherein the water electrolysis unit can electrolyze the water in the washing machine, and the water will produce active oxygen and hypochlorous acid after being electrolyzed. The active oxygen can decompose the organic dirt on the clothes into water and carbon dioxide, and the hypochlorous acid has a sterilization effect, which can prevent bacteria and dust mites from adhering to the clothes, and can greatly improve the effect of washing clothes.

[0044] The eighth pin of the water level detection chip U2 is connected to the main control unit through the forty-seventh resistor R47, the ninth pin, the tenth pin and the twelfth pin of the water level detection chip U2 are connected to the first pin of the eighth connector CN10 through the forty-sixth resistor R46, the eleventh pin and the thirteenth pin of the water level detection chip U2 are connected to the second pin of the eighth connector CN10 through the thirty-eighth resistor, wherein the eighth connector CN10 is also connected to the water level sensor, the water level sensor is installed in the washing machine, and the water level sensor can detect the water level in the washing machine.

[0045] The base of the third transistor Q5 is connected to the main control unit through the eighth resistor R8, the collector of the third transistor Q5 is connected to the base of the fourth transistor Q2 through the second resistor R2, the collector of the fourth transistor Q2 is connected to the first pin of the buzzer BZ1, the collector of the fourth transistor Q2 is connected to the second pin of the buzzer BZ1 through the fourteenth resistor R14, the base of the fifth transistor Q6 is connected to the main control unit through the seventeenth resistor R17, the collector of the fifth transistor Q6 is connected to the second pin of the buzzer BZ1, wherein the buzzer BZ1 reminds the user by emitting a buzzing sound; the first pin of the ninth connector CN6 is connected to the main control unit, the second pin of the ninth connector CN6 is grounded, the third pin of the ninth connector CN6 is respectively connected to the eighth voltage source and the positive electrode of the tenth capacitor C10, and the negative electrode of the tenth capacitor C10 is grounded.

[0046] The utility model adopts a low-power motor drive unit, and the motor drive unit adopts four NMOS to form an H-bridge. Different control effects on the motor are achieved by controlling the conduction and cutoff of the four NMOS tubes. The current detection in the motor drive unit can prevent the motor from burning out when the motor is overloaded. The power supply unit in the utility model can provide 12V and 5V DC power supplies to each unit through a power supply chip, so that the limitations of the washing machine are relatively small and it is easy to promote and use.

[0047] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. All equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A control circuit for a low-power washing machine, comprising an inlet and outlet motor unit, characterized in that: It also includes a main control unit, a motor drive unit connected to the motor, and a power supply unit for providing power to each unit, wherein the main control unit is connected to the water inlet and outlet unit and the motor drive unit, respectively, wherein the motor drive unit includes a first field effect transistor, a second field effect transistor, a third field effect transistor and a fourth field effect transistor, wherein the first field effect transistor, the second field effect transistor, the third field effect transistor and the fourth field effect transistor constitute an H bridge, and the power supply unit includes a power supply chip for providing a DC power supply to the motor drive unit.

2. The control circuit of a low-power washing machine according to claim 1, characterized in that: It also includes a disinfection unit, a water electrolysis unit, a water level detection unit, a reminder unit and a display interface unit, and the main control unit is connected to the disinfection unit, the water electrolysis unit, the water level detection unit, the reminder unit and the display interface unit respectively.

3. The control circuit of a low-power washing machine according to claim 2, characterized in that: The main control unit includes a main control chip, four control ends of the main control chip are connected to the water inlet and outlet unit, two control ends of the main control chip are connected to the motor drive unit, three control ends of the main control chip are connected to the disinfection unit, the control end of the main control chip is connected to the water electrolysis unit, the control end of the main control chip is connected to the water level detection unit, two control ends of the main control chip are connected to the reminder unit, and the control end of the main control chip is connected to the display interface unit.

4. The control circuit of a low-power washing machine according to claim 1, characterized in that: The water inlet and outlet motor unit includes a water inlet motor module and a drainage motor module, and both the water inlet motor module and the drainage motor module are connected to the main control unit; the water inlet motor module includes a fifth field effect transistor and a third resistor, and the gate of the fifth field effect transistor is connected to the main control unit through the third resistor; the drainage motor module includes a drainage motor control chip and a fifteenth resistor, two control ends of the drainage motor control chip are connected to the main control unit, and the control end of the drainage motor control chip is connected to the main control unit through the fifteenth resistor.

5. The control circuit of a low-power washing machine according to claim 1, characterized in that: The motor drive unit also includes a first transistor, a second transistor, a twenty-second resistor, a twenty-third resistor, a twenty-eighth resistor and a thirty-second resistor. The base of the second transistor is connected to the main control unit via the twenty-second resistor and the twenty-third resistor, the source of the third field effect transistor and the fourth field effect transistor is connected to the main control unit via the thirty-second resistor, and the gate of the fourth field effect transistor is connected to the main control unit via the twenty-eighth resistor.

6. The control circuit of a low-power washing machine according to claim 1, characterized in that: The power supply unit also includes a fourteenth capacitor, a first electrolytic capacitor, a magnetic core inductor, a second electrolytic capacitor and a fifteenth capacitor. The first pin of the power supply chip is respectively connected to the positive electrode of the fourteenth capacitor, the positive electrode of the first electrolytic capacitor and the second voltage source, wherein the voltage of the second voltage source is 12V. The fourth pin of the power supply chip and the second pin of the magnetic core inductor are both connected to the positive electrode of the second electrolytic capacitor, the positive electrode of the fifteenth capacitor and the third voltage source, wherein the voltage of the third voltage source is 5V.

7. The control circuit of a low-power washing machine according to claim 2, characterized in that: The disinfection unit includes an ozone module and a blue light module, and both the ozone module and the blue light module are connected to the main control unit; The disinfection unit includes a sixth field effect transistor and a sixth resistor, and the gate of the sixth field effect transistor is connected to the main control unit through the sixth resistor; the blue light module includes a seventh field effect transistor, an eighth field effect transistor, a forty-eighth resistor and a forty-ninth resistor, and the gate of the seventh field effect transistor is connected to the main control unit through the forty-ninth resistor; the gate of the eighth field effect transistor is connected to the main control unit through the forty-eighth resistor.

8. The control circuit of a low-power washing machine according to claim 2, characterized in that: The water electrolysis unit includes a ninth field effect tube and a seventh resistor, and the gate of the ninth field effect tube is connected to the main control unit through the seventh resistor; the water level detection unit includes a water level detection chip and a forty-seventh resistor, and the control end of the water level detection chip is connected to the main control unit through the forty-seventh resistor; The reminder unit includes a third transistor, a fifth transistor, an eighth resistor and a seventeenth resistor, the base of the third transistor is connected to the main control unit through the eighth resistor, and the base of the fifth transistor is connected to the main control unit through the seventeenth resistor; the display interface unit includes a ninth connector, and the first pin of the ninth connector is connected to the main control unit.

Images