Control circuit and method for a laundry appliance, laundry appliance

Abstract

The application discloses a control circuit and method of a laundry device, and the laundry device. The control circuit of the laundry device comprises an energy storage branch, a first switch branch, a second switch branch, a third switch branch and a controller. The controller is configured to receive a deceleration instruction and generate a first control signal, a second control signal and a third control signal according to the deceleration instruction. The first switch branch is configured to establish a connection between a first end of the energy storage branch and a first end of a heating tube according to the first control signal. The second switch branch is configured to establish a connection between a second end of the heating tube and a third end of the third switch branch according to the second control signal. The third switch branch is configured to alternately be in a conduction state and an off state according to the third control signal. The energy storage branch is configured to discharge through the heating tube when the third switch branch is in the conduction state. In this way, the speed of motor deceleration can be improved.

Description

Technical Field

[0001] This application relates to the field of laundry equipment technology, and in particular to a control circuit and method for a laundry equipment, and a laundry equipment. Background Technology

[0002] With the implementation of national energy consumption standards, brushless DC motors (BLDC) are being used more and more widely in variable frequency washing equipment such as washing machines or washer-dryer combos.

[0003] Currently, when decelerating a brushless DC motor, the common method is to short-circuit the lower arm of the inverter bridge that drives the brushless DC motor to achieve short-circuit braking of the motor, thereby reducing the speed of the brushless DC motor.

[0004] However, to achieve rapid deceleration with this method, the brushless DC motor needs to be controlled at a high speed. This results in a large short-circuit current, causing a significant impact on the entire electrical system and posing a risk of damaging electronic components. Therefore, this method can only employ a slower deceleration speed. Summary of the Invention

[0005] This application aims to provide a control circuit and method for a washing machine, and a washing machine that can increase the speed of motor deceleration.

[0006] To achieve the above objectives, in a first aspect, this application provides a control circuit for a washing machine, characterized in that the washing machine includes a heating element for heating, and the control circuit includes:

[0007] Energy storage branch, first switch branch, second switch branch, third switch branch and controller;

[0008] The first end of the energy storage branch is connected to the first end of the input power supply and the first end of the first switch branch, respectively. The second end of the first switch branch is connected to the first end of the heating tube. The second end of the heating tube is connected to the first end of the second switch branch. The second end of the second switch branch is connected to the third end of the third switch branch. The third end of the first switch branch, the third end of the second switch branch, and the first end of the third switch branch are connected to the controller. The second end of the third switch branch is connected to the second end of the energy storage branch and the second end of the input power supply, respectively.

[0009] The controller is used to receive deceleration commands and generate a first control signal, a second control signal, and a third control signal according to the deceleration commands;

[0010] The first switch branch is used to establish a connection between the first end of the energy storage branch and the first end of the heating tube according to the first control signal.

[0011] The second switch branch is used to establish a connection between the second end of the heating tube and the third end of the third switch branch according to the second control signal;

[0012] The third switch branch is used to alternately be in the on state and the off state according to the third control signal;

[0013] The energy storage branch is used to discharge through the heating tube when the third switch branch is in the conducting state.

[0014] In one alternative embodiment, the control circuit further includes a voltage sampling branch, a first end of which is connected to a first end of the energy storage branch, and a second end of which is connected to the controller.

[0015] The voltage sampling branch is used to output a first sampling voltage to the controller based on the voltage at the first end of the energy storage branch;

[0016] The controller is further configured to adjust the duty cycle of the third control signal according to the first sampling voltage when the first sampling voltage is greater than the first voltage threshold, so as to adjust the discharge current of the energy storage branch.

[0017] In an alternative embodiment, the controller is further configured to control the third control signal to a first level signal when the first sampled voltage is less than a second voltage threshold.

[0018] The third switch branch is also used to be in a closed state according to the first level signal, wherein the first voltage threshold is greater than the second voltage threshold.

[0019] In an alternative embodiment, the controller is further configured to control the third control signal to be the first level signal when the first sampled voltage increases from less than the second voltage threshold to greater than the second voltage threshold, and the first sampled voltage remains less than the first voltage threshold.

[0020] In an alternative embodiment, the controller is further configured to adjust the duty cycle of the third control signal according to the first sampling voltage when the first sampling voltage decreases from greater than the first voltage threshold to less than the first voltage threshold, and the first sampling voltage remains greater than the second voltage threshold.

[0021] In one alternative embodiment, the control circuit further includes a rectifier branch;

[0022] The first end of the rectifier branch is connected to the first end of the input power supply and the third end of the first switch branch, the second end of the rectifier branch is connected to the second end of the input power supply and the third end of the second switch branch, the third end of the rectifier branch is connected to the first end of the energy storage branch, and the fourth end of the rectifier branch is connected to the second end of the energy storage branch.

[0023] The rectifier branch is used to rectify the input power supply and charge the energy storage branch so that the energy storage branch stores the electrical energy provided by the input power supply.

[0024] In one alternative embodiment, the energy storage branch includes a first capacitor;

[0025] The first terminal of the first capacitor is connected to the first terminal of the first switch branch, and the second terminal of the first capacitor is grounded.

[0026] In one alternative embodiment, the third switching branch includes a first switching transistor;

[0027] The first terminal of the first switch is connected to the controller, the second terminal of the first switch is grounded, and the third terminal of the first switch is connected to the second terminal of the second switch branch.

[0028] In one alternative embodiment, the first switch branch includes a first switch and a second switch, and the second switch branch includes a third switch and a fourth switch;

[0029] The first end of the first switch is connected to the first end of the second switch and the first end of the heating tube, the second end of the first switch is connected to the first end of the energy storage branch and the third end of the rectifier branch, the second end of the second switch is connected to the first end of the input power supply, and the third ends of both the first switch and the second switch are connected to the controller.

[0030] The first end of the third switch is connected to the first end of the fourth switch and the second end of the heating tube, the second end of the third switch is connected to the third end of the third switch branch, the second end of the fourth switch is connected to the second end of the input power supply, and the third ends of both the third switch and the fourth switch are connected to the controller.

[0031] In one alternative embodiment, the voltage sampling branch includes a first resistor and a second resistor;

[0032] The first resistor and the second resistor are connected in series, and the non-series connection end of the first resistor is connected to the first end of the energy storage branch. The connection end between the first resistor and the second resistor is connected to the controller, and the non-series connection end of the second resistor is grounded.

[0033] Secondly, this application provides a control method based on a washing machine, applied to the controller of the washing machine, wherein the washing machine further includes an energy storage branch, a first switch branch, a second switch branch, a third switch branch, and a heating tube for heating;

[0034] The first end of the energy storage branch is connected to the first end of the input power supply and the first end of the first switch branch, respectively. The second end of the first switch branch is connected to the first end of the heating tube. The second end of the heating tube is connected to the first end of the second switch branch. The second end of the second switch branch is connected to the third end of the third switch branch. The first end of the third switch branch is connected to the controller. The second end of the third switch branch is connected to the second end of the energy storage branch and the second end of the input power supply, respectively.

[0035] The method includes:

[0036] Receive a deceleration command and generate a first control signal, a second control signal, and a third control signal based on the deceleration command;

[0037] According to the first control signal, the first switch branch is controlled to establish a connection between the first end of the energy storage branch and the first end of the heating tube;

[0038] The second control signal controls the second switch branch to establish a connection between the second end of the heating tube and the third end of the third switch branch;

[0039] The third control signal controls the third switch branch to be in a conducting state so that the energy storage branch discharges through the heating tube.

[0040] In an alternative approach, the method further includes:

[0041] Obtain the first sampled voltage;

[0042] When the first sampling voltage is greater than the first voltage threshold, the duty cycle of the third control signal is adjusted according to the first sampling voltage to regulate the discharge current of the energy storage branch.

[0043] Thirdly, this application provides a laundry device that includes the control circuit described above.

[0044] The beneficial effects of this application are as follows: The control circuit for the washing equipment provided in this application includes a heating element for heating. The control circuit includes an energy storage branch, a first switch branch, a second switch branch, a third switch branch, and a controller. When the controller receives a deceleration command, it generates a first control signal, a second control signal, and a third control signal according to the deceleration command. The first control signal, by controlling the first switch branch, establishes a connection between the first end of the energy storage branch and the first end of the heating element. The second control signal, by controlling the second switch branch, establishes a connection between the second end of the heating element and the third end of the third switch branch. The third control signal controls the third switch branch to alternately be in a conducting state and a turning state. Therefore, since the connection between the first end of the energy storage branch and the first end of the heating element, and the connection between the second end of the heating element and the third end of the third switch branch, are established, the energy storage branch can be connected in parallel with the heating element when the third switch branch is in the conducting state, so that the heating element can discharge. Therefore, although the voltage of the energy storage branch will rise when the motor decelerates rapidly, the electrical energy in the energy storage branch can be discharged through the heating tube. Thus, a rapid deceleration method can be adopted. Compared with the slower deceleration method required in related technologies, the deceleration speed of this application is higher, that is, the deceleration speed is improved. Attached Figure Description

[0045] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0046] Figure 1 This is a schematic diagram of the control circuit of the washing equipment provided in the embodiments of this application;

[0047] Figure 2 This is a schematic diagram of the control circuit of a laundry device provided in another embodiment of this application;

[0048] Figure 3 A schematic diagram of the voltage at the first end of the energy storage branch provided in the embodiments of this application;

[0049] Figure 4 A schematic diagram of the circuit structure of the control circuit of the washing equipment provided in the embodiments of this application;

[0050] Figure 5 A schematic diagram of the circuit structure of the control circuit of a laundry device provided in another embodiment of this application;

[0051] Figure 6 A flowchart illustrating a control method based on a laundry device provided in an embodiment of this application. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the control circuit 100 of a washing machine provided in an embodiment of this application. The washing machine includes a heating element for heating. In some embodiments, the heating element is implemented using a heating resistor.

[0054] The control circuit 100 of the washing equipment includes an energy storage branch 40, a first switch branch 10, a second switch branch 20, a third switch branch 30, and a controller 50.

[0055] The first end of the energy storage branch 40 is connected to the first end of the input power supply 200 and the first end of the first switch branch 10, the second end of the first switch branch 10 is connected to the first end of the heating tube 200, the second end of the heating tube 200 is connected to the first end of the second switch branch 20, the second end of the second switch branch 20 is connected to the third end of the third switch branch 30, the third end of the first switch branch 10, the third end of the second switch branch 20 and the first end of the third switch branch 30 are connected to the controller 50, and the second end of the third switch branch 30 is connected to the second end of the energy storage branch 40 and the second end of the input power supply 200, respectively.

[0056] The controller 50 can be a microcontroller unit (MCU) or a digital signal processing (DSP) controller, etc.

[0057] Specifically, the controller 50 receives a deceleration command and generates a first control signal, a second control signal, and a third control signal based on the deceleration command. The first switching branch 10 establishes a connection between the first end of the energy storage branch 40 and the first end of the heating tube 200 based on the first control signal. The second switching branch 20 establishes a connection between the second end of the heating tube 200 and the third end of the third switching branch 30 based on the second control signal. The third switching branch 30 alternately operates in a conducting state and a turning state based on the third control signal. The energy storage branch 40 discharges through the heating tube 200 when the third switching branch 30 is in the conducting state.

[0058] In practical applications, when it is necessary to control the motor deceleration, the user can send a deceleration signal to the controller 50 via wired or wireless means. Upon receiving the deceleration command, the controller 50 generates a first control signal, a second control signal, and a third control signal. The first control signal, by controlling the first switch branch 10, establishes a connection between the first end of the energy storage branch 40 and the first end of the heating tube 200. The second control signal, by controlling the second switch branch 20, establishes a connection between the second end of the heating tube 200 and the third end of the third switch branch 30. The third control signal controls the third switch branch 30 to alternately switch between on and off states. Subsequently, since the connection between the first end of the energy storage branch 40 and the first end of the heating tube 200, and the connection between the second end of the heating tube 200 and the third end of the third switch branch 30 have been established, when the third switch branch 30 is in the conducting state, the energy storage branch 40, the first switch branch 10, the heating tube 200, the second switch branch 20 and the third switch branch 30 form a loop, the energy storage branch 40 is connected in parallel with the heating tube 200, and the energy storage branch 40 discharges through the heating tube 200.

[0059] Therefore, although the voltage of the energy storage branch 40 increases during rapid deceleration of the motor, the electrical energy in the energy storage branch 40 can be discharged through the heating tube 200. Thus, this application can employ a rapid deceleration method. Compared to the slower deceleration methods required in related technologies, this application achieves a higher deceleration speed.

[0060] Furthermore, during motor deceleration, the energy storage branch 40 discharges through the heating tube 200, thereby storing at least some electrical energy in the heating tube 200. When the washing machine uses the heating tube 200 for heating, the electrical energy stored in the heating tube 200 is reused to perform the heating function, thus reducing energy consumption from the perspective of the washing machine.

[0061] In one embodiment, such as Figure 2 As shown, the control circuit 100 also includes a voltage sampling branch 60. The first end of the voltage sampling branch 60 is connected to the first end of the energy storage branch 40, and the second end of the voltage sampling branch 60 is connected to the controller 50.

[0062] Specifically, the voltage sampling branch 60 is used to output a first sampling voltage to the controller 50 based on the voltage at the first terminal of the energy storage branch 40. The controller 50 is also used to adjust the duty cycle of the third control signal according to the first sampling voltage when the first sampling voltage is greater than a first voltage threshold, so as to regulate the discharge current of the energy storage branch 40.

[0063] The first voltage threshold can be set according to the actual application, and this application embodiment does not impose specific limitations on it. In one embodiment, if the first sampling voltage is greater than the first voltage threshold, it can be determined that the voltage of the energy storage branch 40 at this time not only meets the power supply requirements of the motor, but also has additional electrical energy that can be released. Therefore, it is necessary to discharge through the heating tube 200 to prevent the voltage on the energy storage branch 40 from becoming too high and being damaged.

[0064] In this embodiment, after the voltage sampling branch 60 obtains the voltage at the first terminal of the energy storage branch 40, it outputs the corresponding first sampling voltage to the controller 50, which then determines the magnitude of the voltage at the first terminal of the energy storage branch 40. Furthermore, since the voltage on the energy storage branch 40 also supplies power to the motor, the voltage of the energy storage branch 40 cannot be too low, which would prevent the motor from running (in which case, the motor also cannot decelerate properly). Therefore, after determining the voltage on the energy storage branch 40, the controller 50 needs to adjust the duty cycle of the third signal accordingly. In practice, this means adjusting the duty cycle of the third control signal based on the first sampling voltage. Specifically, the first sampling voltage and the duty cycle of the third control signal are positively correlated. That is, the larger the first sampling voltage, the larger the duty cycle of the third control signal, the larger the discharge current of the energy storage branch 40, the more electrical energy is discharged to the heating tube 200, and the faster the motor decelerates. Conversely, the smaller the first sampling voltage, the smaller the duty cycle of the third control signal, the smaller the discharge current of the energy storage branch 40, the less electrical energy can be discharged to the heating tube 200, and the slower the motor decelerates.

[0065] In this embodiment, by setting the voltage sampling branch 60 to sample the voltage of the energy storage branch 40, the duty cycle of the third control signal is adjusted. On the one hand, this can prevent the energy storage branch 40 from over-discharging and causing the motor to fail to decelerate properly, thus ensuring high reliability. On the other hand, it can maximize the speed of motor deceleration, resulting in high working efficiency.

[0066] In one embodiment, the specific implementation process of the controller 50 adjusting the third control signal based on the first sampling voltage includes: the controller 50 is further configured to control the third control signal to be a first level signal when the first sampling voltage is less than the second voltage threshold; the third switch branch 30 is further configured to be in a turned-off state according to the first level signal, wherein the first voltage threshold is greater than the second voltage threshold.

[0067] The second voltage threshold can be set according to the actual application, and this application embodiment does not impose specific restrictions on it.

[0068] Specifically, when the first sampling voltage is small and less than the second voltage threshold, it indicates that the voltage at the first end of the energy storage branch 40 is sufficient to meet the power supply requirements of the motor without damaging the energy storage branch 40. Therefore, the controller 50 can control its output third control signal to remain at the first level, keeping the third switch branch 30 in the off state. At this time, the energy storage branch 40 does not discharge through the heating tube 200, but only supplies power to the motor, ensuring the motor can perform the power-off process normally.

[0069] In one embodiment, the specific implementation process of the controller 50 adjusting the third control signal based on the first sampling voltage further includes: the controller 50 is also used to control the third control signal to be a first level signal when the first sampling voltage increases from less than the second voltage threshold to greater than the second voltage threshold, and the first sampling voltage remains less than the first voltage threshold.

[0070] Specifically, if the first sampling voltage increases from less than the second voltage threshold to greater than the second voltage threshold U2, it means that before the first sampling voltage increases to greater than the second voltage threshold, the first sampling voltage was less than the second voltage threshold, and the third switching branch 30 remained in the off state. Furthermore, keeping the third switching branch 30 in the off state before the first sampling voltage increases to equal the first voltage threshold helps provide sufficient turn-off time for the third switching branch 30, preventing it from being turned on again before being completely turned off.

[0071] In one embodiment, the specific implementation process of the controller 50 adjusting the third control signal based on the first sampling voltage further includes: the controller 50 is also used to adjust the duty cycle of the third control signal according to the first sampling voltage when the first sampling voltage decreases from greater than the first voltage threshold to less than the first voltage threshold, and the first sampling voltage remains greater than the second voltage threshold.

[0072] Specifically, if the first sampling voltage decreases from above the first voltage threshold to below the first voltage threshold, it indicates that before decreasing to below the first voltage threshold, the first sampling voltage was above the first voltage threshold, and the third switching branch 30 alternately remained in the on and off states. Subsequently, before the first sampling voltage decreases to equal the second voltage threshold, maintaining the third switching branch 30 in the alternating on and off states helps to fully discharge the energy storage branch 40, thus protecting the energy storage branch 40 and improving the reliability and stability of the circuit operation.

[0073] The following is Figure 3 The voltage curve shown is used as an example for illustration.

[0074] Figure 3The diagram illustrates the voltage curve at the first terminal of the energy storage branch 40. The horizontal axis represents voltage, and the vertical axis represents time. Curve U0 represents the voltage at the first terminal of the energy storage branch 40 (also the first sampling voltage); the dashed line U1 represents the first voltage threshold; and the dashed line U2 represents the second voltage threshold.

[0075] During the period from time T1 to time T2, the voltage UO at the first terminal of the energy storage branch 40 is always less than the second voltage threshold U2. At this time, the controller 50 controls the third control signal to be a first level signal.

[0076] During the period from time T1 to time T2, the first sampling voltage U0 gradually increases from being less than the second voltage threshold U2. At time T2, the first sampling voltage U0 increases to be equal to the second voltage threshold U2. During the period from time T2 to time T3, the first sampling voltage U0 increases to be greater than the second voltage threshold U2, and remains less than the first voltage threshold U1. At this time, the controller 50 controls the third control signal to remain at the first level signal.

[0077] During the period from time T3 to time T4, the first sampling voltage U0 remains greater than the first voltage threshold U1. The controller 50 controls the third control signal to alternate between the first level signal and the second level signal. The first level signal and the second level signal are different signals. For example, when the first level signal is a low level signal and the second level signal is a high level signal, the third control signal is a combination of the first level signal and the second level signal, which is also a square wave signal.

[0078] During the period from time T3 to T4, the first sampled voltage U0 gradually decreases from being greater than the first voltage threshold U1. At time T2, the first sampled voltage U0 decreases to be equal to the first voltage threshold U1. During the period from time T4 to T5, the first sampled voltage U0 decreases to be less than the first voltage threshold U1 and remains above the second voltage threshold U2. At this time, the controller 50 controls the third control signal to alternate between the first level signal and the second level signal.

[0079] During the period from time T5 to time T6, the voltage UO at the first terminal of the energy storage branch 40 is always less than the second voltage threshold U2. At this time, the controller 50 controls the third control signal to be a first level signal.

[0080] In one embodiment, such as Figure 4 As shown, the control circuit 100 also includes a rectifier branch 70.

[0081] The first end of the rectifier branch 70 is connected to the first end of the input power supply 200 and the third end of the first switch branch 10, the second end of the rectifier branch 70 is connected to the second end of the input power supply 200 and the third end of the second switch branch 20, the third end of the rectifier branch 70 is connected to the first end of the energy storage branch 40, and the fourth end of the rectifier branch 70 is connected to the second end of the energy storage branch 40.

[0082] Specifically, the rectifier branch 70 is used to rectify the input power supply 200 to charge the energy storage branch 40, so that the energy storage branch 40 stores the electrical energy provided by the input power supply 200.

[0083] Figure 4 The diagram also exemplarily illustrates one structure of the rectifier branch 70. For example... Figure 4 As shown, the rectifier branch 70 includes a rectifier bridge U2. The rectifier bridge U2 includes four diodes to achieve full-wave rectification.

[0084] Taking an input power supply 200 as an AC power source such as mains power, with its first terminal being the live wire and its second terminal being the neutral wire, as an example: If the input power supply 200 is in the positive half-wave of a sine wave, then the first diode D1 and the fourth diode D4 conduct; if the input power supply 200 is in the negative half-wave of a sine wave, then the second diode D2 and the third diode D3 conduct. Thus, full-wave rectification of the input power supply 200 is achieved.

[0085] It is understood that in this embodiment, full-wave rectification is used as an example for rectifier branch 70. However, in other embodiments, other rectification methods such as half-wave rectification may also be used. This application does not impose specific limitations on this.

[0086] Figure 4 The diagram also exemplarily illustrates one structure of the voltage sampling branch 60. For example... Figure 4 As shown, the voltage sampling branch 60 includes a first resistor R1 and a second resistor R2.

[0087] In this circuit, the first resistor R1 and the second resistor R2 are connected in series, and the non-series connection end of the first resistor R1 is connected to the first end of the energy storage branch 40. The connection end between the first resistor R1 and the second resistor R2 is connected to the controller 30, and the non-series connection end of the second resistor R2 is grounded to GND. The non-series connection end of the first resistor R1 is the first end of the voltage sampling branch 60, and the connection end between the first resistor R1 and the second resistor R2 is the second end of the voltage sampling branch 60.

[0088] Specifically, the first resistor R1 and the second resistor R2 are used to divide the voltage at the first end of the energy storage branch 40, and the voltage divided on the second resistor R2 is used as the first sampling voltage input to the controller 50.

[0089] Figure 4 The diagram also exemplarily illustrates one structure of the energy storage branch 40. For example... Figure 4 As shown, the energy storage branch 40 includes a first capacitor C1.

[0090] The first terminal of the first capacitor C1 is connected to the first terminal of the first switch branch 10, and the second terminal of the first capacitor C1 is grounded to GND. The first terminal of the first capacitor C1 is the first terminal of the energy storage branch 40, and the second terminal of the first capacitor C1 is the second terminal of the energy storage branch 40.

[0091] Specifically, the first capacitor C1 can be charged based on the voltage output by the rectifier branch 70 to store energy. The first capacitor C1 can also discharge the heating tube U1 when the first switch branch 10 and the second switch branch 20 are turned on.

[0092] In one embodiment, the third switch branch 30 includes a first switch transistor Q1.

[0093] In this circuit, the first terminal of the first switch Q1 is connected to the controller Q1, the second terminal of the first switch Q1 is grounded to GND, and the third terminal of the first switch Q1 is connected to the second terminal of the second switch branch 20. The first terminal of the first switch Q1 is the first terminal of the third switch branch 30, the second terminal of the first switch Q1 is the second terminal of the third switch branch 30, and the third terminal of the first switch Q1 is the third terminal of the third switch branch 30.

[0094] Specifically, when the third control signal output by the controller 50 is at a low level (corresponding to the first level signal in the above embodiment), the first switch Q1 is turned off, and the first capacitor C1 cannot discharge through the heating tube U1; when the third control signal output by the controller 50 is at a high level (corresponding to the second level signal in the above embodiment), the first switch Q1 is turned on. When the first switch branch 10 and the second switch branch 20 are connected, the first capacitor C1 can discharge through the heating tube U1.

[0095] In this embodiment, the first switch Q1 is an NMOS transistor. The gate of the NMOS transistor is the first terminal of the first switch Q1, the source of the NMOS transistor is the second terminal of the first switch Q1, and the drain of the NMOS transistor is the third terminal of the first switch Q1.

[0096] In addition, the first switching transistor Q1 can be any controllable switch, such as an insulated-gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction-gate field-effect transistor (JFET) device, a MOS-controlled thyristor (MCT) device, etc. Furthermore, Figure 4 The first switch Q1 shown can be implemented as multiple switches connected in parallel.

[0097] Figure 4 The diagram also exemplarily illustrates one structure of the first switch branch 10. For example... Figure 4 As shown, the first switch branch 10 includes a first switch S1 and a second switch S2, and the second switch branch 20 includes a third switch S2 and a fourth switch S4.

[0098] Specifically, the first terminal of the first switch S1 is connected to the first terminal of the second switch S2 and the first terminal of the heating tube U1. The second terminal of the first switch S1 is connected to the first terminal of the energy storage branch 40 and the third terminal of the rectifier branch 70. The second terminal of the second switch S2 is connected to the first terminal of the input power supply 200. The third terminals of both the first switch S1 and the second switch S2 are connected to the controller 50. The second terminal of the first switch S1 is the first terminal of the first switch branch 10, the first terminal of the first switch S1 is the second terminal of the first switch branch 10, and the third terminal of the first switch S1 is the third terminal of the first switch branch 10.

[0099] The first terminal of the third switch S3 is connected to the first terminal of the fourth switch S4 and the second terminal of the heating tube U1. The second terminal of the third switch S3 is connected to the third terminal of the third switch branch 30. The second terminal of the fourth switch S4 is connected to the second terminal of the input power supply 200. The third terminals of both the third switch S3 and the fourth switch S4 are connected to the controller 50. The first terminal of the third switch S3 is the first terminal of the second switch branch 20, the second terminal of the third switch S3 is the second terminal of the second switch branch 20, and the third terminal of the third switch S3 is the third terminal of the second switch branch 20.

[0100] Specifically, when the first switch branch 10 receives the first control signal, the first switch S1 in the first switch branch 10 is turned on, the second switch S2 is turned off, and the first terminal of the first capacitor C1 is connected to the first terminal of the heating tube U1; when the first switch branch 10 does not receive the first control signal and the washing equipment needs to operate the heating function, the first switch S1 in the first switch branch 10 is turned off, and the second switch S2 is turned on.

[0101] When the second switch branch 20 receives the second control signal, the third switch S3 in the second switch branch 20 is turned on, the fourth switch S4 is turned off, and the second end of the heating tube U1 is connected to the third end of the first switch tube Q1; when the second switch branch 20 does not receive the second control signal, and the washing equipment needs to operate the heating function, the third switch S3 in the second switch branch 20 is turned off, and the fourth switch S4 is turned on.

[0102] In summary, when the first switch branch 10 receives the first control signal, the second switch branch 20 receives the second control signal, and the third switch branch 10 is in a conducting state based on the third control signal, the first capacitor C1 forms a circuit with the first switch S1, the heating tube U1, and the third switch S3 with the first switch tube Q1. The first capacitor C1 can then discharge through the heating tube U1. Therefore, when controlling the motor to decelerate, since the electrical energy acting on the first capacitor C1 can be consumed through the heating tube U1, the motor can be controlled to decelerate at a relatively fast speed without damaging the first capacitor C1. Furthermore, no additional energy-consuming devices are needed; the existing heating tube U1 in the washing machine is directly utilized, saving costs. In addition, since the first capacitor C1 discharges through the heating tube U1 during motor deceleration, the heating tube U1 retains a certain amount of energy. When the washing machine performs its heating function, this energy can be used for heating, achieving energy reuse and saving energy consumption.

[0103] When the washing machine needs to perform the heating function, the second switch S2 in the first switch branch 10 and the fourth switch S4 in the second switch branch 20 are closed. The input power supply 200, the second switch S2, the heating tube U1 and the fourth switch S4 form a circuit, and the heating tube U1 is energized to perform heating.

[0104] It should be noted that in this embodiment, the first switch branch 10 and the second switch branch 20 each include two switches as an example. However, in other embodiments, the function of two switches can also be implemented in other ways, such as the first switch branch 10 and the second switch branch 20 each including only one single-pole double-throw switch. This application embodiment does not impose specific limitations on this.

[0105] Please refer to Figure 5 , Figure 5 The circuit structure of the control circuit of a washing machine is shown in another embodiment of this application.

[0106] like Figure 5 As shown, the control circuit 100 of the washing equipment also includes a drive branch 80, a second switch Q2, a third switch Q3, a fourth switch Q4, a fifth switch Q5, a sixth switch Q6, a seventh switch Q7, a third resistor R3, a fourth resistor R4, and a fifth resistor R5.

[0107] The drive branch 80 is connected to the controller 50 and the first switch Q1, second switch Q2, third switch Q3, fourth switch Q4, fifth switch Q5, sixth switch Q6, and seventh switch Q7, respectively. The drive branch 80 is used to drive the signals of each switch (including the first switch Q1, second switch Q2, third switch Q3, fourth switch Q4, fifth switch Q5, sixth switch Q6, and seventh switch Q7) based on the signals output by the controller 50. The drive branch 80 enhances the driving capability of the signals output by the controller 50, enabling stable switching of the switches and improving the stability of the control circuit of the washing machine. The drive branch 80 is well-known in the art and will not be described in detail here.

[0108] Please refer to Figure 6 , Figure 6 This is a flowchart illustrating a control method for a washing machine based on an embodiment of this application. The control method is applied to the controller of the washing machine. The washing machine further includes an energy storage branch, a first switch branch, a second switch branch, a third switch branch, and a heating element for heating.

[0109] The first end of the energy storage branch is connected to the first end of the input power supply and the first end of the first switch branch. The second end of the first switch branch is connected to the first end of the heating tube. The second end of the heating tube is connected to the first end of the second switch branch. The second end of the second switch branch is connected to the third end of the third switch branch. The first end of the third switch branch is connected to the controller. The second end of the third switch branch is connected to the second end of the energy storage branch and the second end of the input power supply.

[0110] In some embodiments, the circuit structures in the washing equipment can be configured as follows: Figures 1-5 The circuit structure shown is implemented in detail in the above embodiments, and will not be repeated here.

[0111] like Figure 6 As shown, the control method based on the washing equipment includes the following steps:

[0112] Step 601: Receive deceleration command and generate a first control signal, a second control signal and a third control signal according to the deceleration command.

[0113] Step 602: Control the first switch branch to establish the connection between the first end of the energy storage branch and the first end of the heating tube according to the first control signal.

[0114] Step 603: Control the second switch branch to establish a connection between the second end of the heating tube and the third end of the third switch branch according to the second control signal.

[0115] Step 604: Control the third switch branch to be in the conducting state according to the third control signal so that the energy storage branch discharges through the heating tube.

[0116] Specifically, upon receiving a deceleration command, the controller generates a first control signal, a second control signal, and a third control signal. The first control signal, by controlling the first switching branch, establishes a connection between the first end of the energy storage branch and the first end of the heating tube. The second control signal, by controlling the second switching branch, establishes a connection between the second end of the heating tube and the third end of the third switching branch. The third control signal controls the third switching branch to alternately be in a conducting state and a turning state. Subsequently, since the connections between the first end of the energy storage branch and the first end of the heating tube, and between the second end of the heating tube and the third end of the third switching branch, when the third switching branch is in the conducting state, the energy storage branch 40, the first switching branch 10, the heating tube 200, the second switching branch 20, and the third switching branch 30 form a circuit, and the energy storage branch 40 discharges through the heating tube 200.

[0117] Therefore, although the voltage of the energy storage branch increases during rapid motor deceleration, the electrical energy in the energy storage branch can be discharged through the heating element. Thus, this application can employ a rapid deceleration method. Compared to the slower deceleration methods required in related technologies, this application achieves a faster deceleration speed.

[0118] In one embodiment, the control method based on the washing equipment further includes the following steps: acquiring a first sampling voltage; when the first sampling voltage is greater than a first voltage threshold, adjusting the duty cycle of a third control signal according to the first sampling voltage to adjust the discharge current of the energy storage branch.

[0119] It should be understood that the specific control of each circuit in the washing equipment and the beneficial effects produced in the method embodiment can be referred to the corresponding description in the embodiment of the control circuit of the washing equipment above. For the sake of brevity, it will not be repeated here.

[0120] This application also provides a laundry device, which includes the control circuit of the laundry device in any embodiment of this application.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A control circuit for a washing machine, characterized in that, The washing equipment includes a heating element for heating, and the control circuit includes: Energy storage branch, first switch branch, second switch branch, third switch branch and controller; The first end of the energy storage branch is connected to the first end of the input power supply and the first end of the first switch branch, respectively. The second end of the first switch branch is connected to the first end of the heating tube. The second end of the heating tube is connected to the first end of the second switch branch. The second end of the second switch branch is connected to the third end of the third switch branch. The third end of the first switch branch, the third end of the second switch branch, and the first end of the third switch branch are connected to the controller. The second end of the third switch branch is connected to the second end of the energy storage branch and the second end of the input power supply, respectively. The controller is used to receive deceleration commands and generate a first control signal, a second control signal, and a third control signal according to the deceleration commands; The first switch branch is used to establish a connection between the first end of the energy storage branch and the first end of the heating tube according to the first control signal. The second switch branch is used to establish a connection between the second end of the heating tube and the third end of the third switch branch according to the second control signal; The third switch branch is used to alternately be in the on state and the off state according to the third control signal; The energy storage branch is used to discharge through the heating tube when the third switch branch is in the conducting state; The control circuit further includes a voltage sampling branch, the first end of which is connected to the first end of the energy storage branch, and the second end of which is connected to the controller. The voltage sampling branch is used to output a first sampling voltage to the controller based on the voltage at the first end of the energy storage branch; The controller is further configured to adjust the duty cycle of the third control signal according to the first sampling voltage when the first sampling voltage is greater than the first voltage threshold, so as to adjust the discharge current of the energy storage branch, wherein the first sampling voltage and the duty cycle of the third control signal are positively correlated. The controller is further configured to control the third control signal to be a first level signal when the first sampled voltage is less than the second voltage threshold. The third switch branch is also used to be in a closed state according to the first level signal, wherein the first voltage threshold is greater than the second voltage threshold. The controller is further configured to adjust the duty cycle of the third control signal according to the first sampling voltage when the first sampling voltage decreases from greater than the first voltage threshold to less than the first voltage threshold, and the first sampling voltage remains greater than the second voltage threshold.

2. The control circuit according to claim 1, characterized in that, The controller is further configured to control the third control signal to be the first level signal when the first sampled voltage increases from less than the second voltage threshold to greater than the second voltage threshold, and the first sampled voltage remains less than the first voltage threshold.

3. The control circuit according to claim 1 or 2, characterized in that, The control circuit also includes a rectifier branch; The first end of the rectifier branch is connected to the first end of the input power supply and the third end of the first switch branch, the second end of the rectifier branch is connected to the second end of the input power supply and the third end of the second switch branch, the third end of the rectifier branch is connected to the first end of the energy storage branch, and the fourth end of the rectifier branch is connected to the second end of the energy storage branch. The rectifier branch is used to rectify the input power supply and charge the energy storage branch so that the energy storage branch stores the electrical energy provided by the input power supply.

4. The control circuit according to claim 1, characterized in that, The energy storage branch includes a first capacitor; The first terminal of the first capacitor is connected to the first terminal of the first switch branch, and the second terminal of the first capacitor is grounded.

5. The control circuit according to claim 1, characterized in that, The third switch branch includes a first switch transistor; The first terminal of the first switch is connected to the controller, the second terminal of the first switch is grounded, and the third terminal of the first switch is connected to the second terminal of the second switch branch.

6. The control circuit according to claim 3, characterized in that, The first switch branch includes a first switch and a second switch, and the second switch branch includes a third switch and a fourth switch; The first end of the first switch is connected to the first end of the second switch and the first end of the heating tube, the second end of the first switch is connected to the first end of the energy storage branch and the third end of the rectifier branch, the second end of the second switch is connected to the first end of the input power supply, and the third ends of both the first switch and the second switch are connected to the controller. The first end of the third switch is connected to the first end of the fourth switch and the second end of the heating tube, the second end of the third switch is connected to the third end of the third switch branch, the second end of the fourth switch is connected to the second end of the input power supply, and the third ends of both the third switch and the fourth switch are connected to the controller.

7. The control circuit according to claim 1, characterized in that, The voltage sampling branch includes a first resistor and a second resistor; The first resistor and the second resistor are connected in series, and the non-series connection end of the first resistor is connected to the first end of the energy storage branch. The connection end between the first resistor and the second resistor is connected to the controller, and the non-series connection end of the second resistor is grounded.

8. A control method based on a washing machine, characterized in that, The controller is applied to the washing equipment, which further includes an energy storage branch, a first switch branch, a second switch branch, a third switch branch, and a heating element for heating. The first end of the energy storage branch is connected to the first end of the input power supply and the first end of the first switch branch, respectively. The second end of the first switch branch is connected to the first end of the heating tube. The second end of the heating tube is connected to the first end of the second switch branch. The second end of the second switch branch is connected to the third end of the third switch branch. The first end of the third switch branch is connected to the controller. The second end of the third switch branch is connected to the second end of the energy storage branch and the second end of the input power supply, respectively. The method includes: Receive a deceleration command and generate a first control signal, a second control signal, and a third control signal based on the deceleration command; According to the first control signal, the first switch branch is controlled to establish a connection between the first end of the energy storage branch and the first end of the heating tube; The second control signal controls the second switch branch to establish a connection between the second end of the heating tube and the third end of the third switch branch; The third control signal controls the third switch branch to be in a conducting state so that the energy storage branch discharges through the heating tube. Obtain the first sampled voltage; When the first sampling voltage is greater than the first voltage threshold, the duty cycle of the third control signal is adjusted according to the first sampling voltage to regulate the discharge current of the energy storage branch. The first sampling voltage and the duty cycle of the third control signal are positively correlated. When the first sampling voltage is less than the second voltage threshold, the third control signal is controlled to be a first level signal, wherein the third switch branch is also used to be in a turn-off state according to the first level signal, and the first voltage threshold is greater than the second voltage threshold; When the first sampling voltage decreases from greater than the first voltage threshold to less than the first voltage threshold, and the first sampling voltage remains greater than the second voltage threshold, the duty cycle of the third control signal is adjusted according to the first sampling voltage.

9. A washing machine, characterized in that, Includes the control circuit as described in any one of claims 1-7.

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